{"id":142,"date":"2020-09-16T09:16:40","date_gmt":"2020-09-16T04:16:40","guid":{"rendered":"https:\/\/talib.pk\/test-preparation\/?p=142"},"modified":"2020-09-16T09:16:40","modified_gmt":"2020-09-16T04:16:40","slug":"chemistry-1st-year-basic-concepts-mcqs","status":"publish","type":"post","link":"https:\/\/talib.pk\/test-preparation\/chemistry-1st-year-basic-concepts-mcqs\/","title":{"rendered":"Chemistry 1st Year Basic Concepts MCQs"},"content":{"rendered":"<div class=\"28d95f43054b69d67289d6316e9506d8\" data-index=\"1\" style=\"float: none; margin:12px 0 12px 0; text-align:center;\">\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- talib-new -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3438155045791616\"\r\n     data-ad-slot=\"6774242552\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n(adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Students can check Chemistry 1st Year Basic Concepts MCQs here for the preparation of Entry Test MCQs here. In Chemistry, the first thing which we study is an Atom. The shortest\/minor part of an element that takes part in a chemical reaction is an Atom. Then comes molecules, ions, and many others. Mass Spectrometry is used to determine the masses of Isotopes. There are two types of formulas to represent a substance including Empirical and Molecular Formula. Avogadro&#8217;s Number has its significance while studying the atom, molecules, and ions. Stoichiometry balances the quantities of products and reactants. The term Limiting reactant controls the number of whole reactions. So, here we are providing you the most important MCQs. You can prepare for them easily.<\/p>\n<h2 style=\"text-align: center;\">Chemistry 1st Year Basic Concepts MCQs<\/h2>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-398 aligncenter\" src=\"https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2019\/09\/Chemistry-1.jpg\" alt=\"Chemistry 1st Year Basic Concepts MCQs\" width=\"300\" height=\"300\" srcset=\"https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2019\/09\/Chemistry-1.jpg 300w, https:\/\/talib.pk\/test-preparation\/wp-content\/uploads\/2019\/09\/Chemistry-1-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<h3>KEY POINTS<\/h3>\n<div class=\"box info  alignleft\" style=\"width:100%\"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\t\n<div class=\"lightbulb tie-list-shortcode\">\n<ul>\n<li>Atom\/Molecule\/Ion<\/li>\n<li>Relative Atomic Mass<\/li>\n<li>Isotopes<\/li>\n<li>Mass Spectrometry<\/li>\n<li>Empirical Formula by Combustion Analysis<\/li>\n<li>Empirical and Molecular Formula<\/li>\n<li>Concept of Mole<\/li>\n<li>Avogadro&#8217;s Number<\/li>\n<li>Mole Volume<\/li>\n<li>Stoichiometry<\/li>\n<li>Limiting Reactant<\/li>\n<\/ul>\n<\/div>\n\t\t\t<\/div><\/div>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #ff6600;\">Question#1<\/span>. The largest number of moles are present in:<\/strong><\/p>\n<ul>\n<li>3.6g H<sub>2<\/sub>O<\/li>\n<li>2.8g CO<\/li>\n<li>4.8g C<sub>2<\/sub>H<sub>5<\/sub>OH<\/li>\n<li>5.4g N<sub>2<\/sub>O<sub>5<\/sub><\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>3.6g H<sub>2<\/sub>O<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#2<\/span>. The stoichiometric calculations for a chemical reaction results in:<\/strong><\/p>\n<ul>\n<li>Actual yield<\/li>\n<li>Theoretical yield<\/li>\n<li>Percentage yield<\/li>\n<li>Selectivity<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Percentage yield<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#3<\/span>. Which of the following not has equal number of atoms as that in 6g Molybdenum (A<sub>r<\/sub> : 96)<\/strong><\/p>\n<ul>\n<li>3 g O<sub>3<\/sub><\/li>\n<li>4 g SO<sub>2<\/sub><\/li>\n<li>4 g Ca<\/li>\n<li>5 g SO<sub>3<\/sub><\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>4 g Ca<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#4<\/span>. 1 gram molecule refers to:<\/strong><\/p>\n<ul>\n<li>Amount in grams equivalent to 1 mole of an atom<\/li>\n<li>Amount in grams equivalent to\u00a0 1 mole of a molecule<\/li>\n<li>Amount in grams equivalent to 1 mole of a molecule or a compound<\/li>\n<li>Amount in grams of an ionic compound<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Amount in grams equivalent to\u00a0 1 mole of a molecule<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#5<\/span>. Number of H<sup>+ <\/sup>ions when 0.1 mole of sulfuric acid is completely ionized in water:<\/strong><\/p>\n<ul>\n<li>4&#215;6.022 x 10<sup>23<\/sup><\/li>\n<li>2&#215;6.002 x 10<sup>23<\/sup><\/li>\n<li>1 x 6.022 x 10<sup>23<\/sup><\/li>\n<li>None of these<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>None of these<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#6<\/span>. 1 gram formula refers to:<\/strong><\/p>\n<ul>\n<li>Amount in grams equivalent\u00a0 to 1 mole of an atom<\/li>\n<li>Amount in grams equivalent to 1 mole of a covalent compound<\/li>\n<li>Amount in grams equivalent to 1 mole of an ionic compound<\/li>\n<li>Amount in grams equivalent to 1 mole of an ion<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Amount in grams equivalent to 1 mole of a ionic compound<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#7<\/span>. How many electrons have to be removed to ionize 1.0 x 10<sup>-6<\/sup> mol of Ne atoms to Ne<sup>+<\/sup> ions in a neon advertising tube?<\/strong><\/p>\n<ul>\n<li>6.02 x 10<sup>23 <\/sup>\/ 1.0 x 10<sup>-6<\/sup><\/li>\n<li>1.0 x 10<sup>-6<\/sup> x 6.02 x 10<sup>23<\/sup> \/ 20.2<\/li>\n<li>1.0 x 10<sup>-6<\/sup> x 6.02 x 10<sup>23<\/sup><\/li>\n<li>1.0 x 10<sup>-6<\/sup> x 6.02 x 10<sup>23<\/sup> \/ 9.65 x 10<sup>-1<\/sup><\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>1.0 x 10<sup>-6<\/sup> x 6.02 x 10<sup>23<\/sup><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#8<\/span>. One mole of SO<sub>2<\/sub> contains:<\/strong><\/p>\n<ul>\n<li>6.002 x 10<sup>23<\/sup> atoms of Oxygen<\/li>\n<li>6.002 x 10<sup>23<\/sup> atoms of Sulphur<\/li>\n<li>18.1 x 10<sup>23<\/sup> molecules of SO<sub>2<\/sub><\/li>\n<li>4 g atoms of SO<sub>2<\/sub><\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>6.002 x 10<sup>23<\/sup> atoms of Sulphur<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#9<\/span>. Mg reacts with HCl as per the following reactions:<\/strong><\/p>\n<p><strong>Mg<sub>(s)<\/sub> + 2HCl<sub>(aq)<\/sub> \u2192 MgCl<sub>2(aq)<\/sub> + H<sub>2(g)<\/sub><\/strong><br \/>\n<strong>Given that; Mg = 21g and HCl = 21g, the excess reactant is;<\/strong><\/p>\n<ul>\n<li>Mg<strong><br \/>\n<\/strong><\/li>\n<li>HCl<\/li>\n<li>Both are present in an equal stoichiometric amount<\/li>\n<li>None of these<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Mg<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#10<\/span>. 5604 cm<sup>3<\/sup> of H<sub>2<\/sub> gas at STP contains of hydrogen:<\/strong><\/p>\n<ul>\n<li>6.02 x 10<sup>23<\/sup><\/li>\n<li>2.6 x 10<sup>23<\/sup><\/li>\n<li>3.01 x 10<sup>23<\/sup><\/li>\n<li>1.50 x 10<sup>23<\/sup><\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>2.6 x 10<sup>23<\/sup><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#11.<\/span> Number of moles present in 0.6 grams of silica is (Atomic mass Si = 28, O = 16)?<\/strong><\/p>\n<ul>\n<li>0.01 mole<\/li>\n<li>0.064 mole<\/li>\n<li>0.044 mole<\/li>\n<li>0.054 mole<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>0.01 mole<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#12<\/span>. Gram atoms of hydrogen in 5.5g H<sub>2:<\/sub><\/strong><\/p>\n<ul>\n<li>5.50<strong><br \/>\n<\/strong><\/li>\n<li>2.25<\/li>\n<li>5.45<\/li>\n<li>2.20<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>5.50<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#13<\/span>. Mass in grams of 10 moles of aspartame (C<sub>14<\/sub>H<sub>18<\/sub>N<sub>2<\/sub>O<sub>5<\/sub>):<\/strong><\/p>\n<ul>\n<li>29400g<\/li>\n<li>2940g<strong><br \/>\n<\/strong><\/li>\n<li>2850g<\/li>\n<li>2800g<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>2940g<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#14<\/span>. % of the nitrogen in urea (NH<sub>2<\/sub>CONH<sub>2<\/sub>):<\/strong><\/p>\n<ul>\n<li>82.35%<\/li>\n<li>35%<\/li>\n<li>46.6%<\/li>\n<li>55.56%<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>46.6%<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#15<\/span>. One mole of potassium chlorate is thermally decomposed and excess of aluminum is burnt in the gaseous mixture. How many moles of aluminum oxide is formed? Respective equations are given as:<\/strong><\/p>\n<p><strong>2KClO<sub>3<\/sub> \u00a0\u2192 KCl + 3O<sub>2<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 4Al + 3O<sub>2<\/sub>\u00a0 \u2192 2Al<sub>2<\/sub>O<sub>3<\/sub><\/strong><\/p>\n<ul>\n<li>1<strong><br \/>\n<\/strong><\/li>\n<li>2<\/li>\n<li>1.5<\/li>\n<li>3<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>1<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#16<\/span>. In a mass spectrometer, increasing the magnetic field strength with constant electric field results in?<\/strong><\/p>\n<ul>\n<li>Increased radius \u2018r\u2019<\/li>\n<li>Increased ionization<\/li>\n<li>No effect<\/li>\n<li>Increased ionization<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>No effect<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#17<\/span>. In a mass spectrometer, increasing the electric field with constant magnetic field results in:<\/strong><\/p>\n<ul>\n<li>Increased radius \u2018r\u2019<\/li>\n<li>Increased ionization<\/li>\n<li>Decreased radius \u2018r\u2019<\/li>\n<li>None of the above<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Increased radius \u2018r<\/strong>\u2019\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#18<\/span>. When 0.5 moles of Al<sub>2<\/sub>(SO<sub>4<\/sub>)<sub>3<\/sub> are dissolved in water, the total number of particles produced?<\/strong><\/p>\n<ul>\n<li>1.2 x 10<sup>23<\/sup><\/li>\n<li>3.0 x 10<sup>23<\/sup><\/li>\n<li>1.5 x 10<sup>24<\/sup><\/li>\n<li>2.5 x 10<sup>23<\/sup><\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>1.5 x 10<sup>24<\/sup><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#19<\/span>. A smuggler was caught by Airport police and 24 g of diamond was recovered from him. How many atoms of carbon he was carrying?<\/strong><\/p>\n<ul>\n<li>6 x 10<sup>23<\/sup><\/li>\n<li>1.8 x 10<sup>24<\/sup><\/li>\n<li>1.2 x 10<sup>24<\/sup><\/li>\n<li>2.4 x 10<sup>24<\/sup><\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>1.2 x 10<sup>24<\/sup><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#20<\/span>. Which of the following contains 1 mole of the stated particle?<\/strong><\/p>\n<ul>\n<li>Chlorine molecules in 35.5 g of chlorine gas<\/li>\n<li>Electrons in 1g of hydrogen gas<\/li>\n<li>Hydrogen ions in 1dm<sup>3<\/sup> of 1 mol dm<sup>-3<\/sup> aqueous sulphuric acid<\/li>\n<li>Oxygen atoms in 22.4 dm<sup>3<\/sup> of oxygen gas at STP<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Electrons in 1g of hydrogen gas<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#21<\/span>. During combustion analysis, which one is used for absorbing carbon dioxide?<\/strong><\/p>\n<ul>\n<li>50% KOH solution<\/li>\n<li>Mg (ClO<sub>4<\/sub>)<sub>2<\/sub><\/li>\n<li>Silica gel and Mg (ClO<sub>4<\/sub>)<sub>2<\/sub><\/li>\n<li>Silica gel<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>50% KOH solution<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#22<\/span>. Which one is a monoisotopic element?<\/strong><\/p>\n<ul>\n<li>Cl<\/li>\n<li>H<\/li>\n<li>F<strong><br \/>\n<\/strong><\/li>\n<li>Cd<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>F<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#23<\/span>. Molecular ions are produced in the mass spectrometer. Which type of molecular ions is more abundant?<\/strong><\/p>\n<ul>\n<li>Negatively charged<\/li>\n<li>Positively charged<\/li>\n<li>H<sup>+<\/sup> ions<\/li>\n<li>Equal positive and negative ions<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Positively charged<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#24<\/span>. The height of the peak in mass spectrum shows:<\/strong><\/p>\n<ul>\n<li>Number of isotopes<\/li>\n<li>Mass Number<\/li>\n<li>Relative abundance<\/li>\n<li>Number of protons<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Relative abundance<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#25<\/span>. The separation of different isotopes in the mass spectrometer is done on the basis of:<\/strong><\/p>\n<ul>\n<li>Different amounts of positive change on each ion<\/li>\n<li>Different\u00a0 m\/e<\/li>\n<li>Different\u00a0 e\/m value<\/li>\n<li>Velocities of the ions<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Different\u00a0 e\/m value<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#26<\/span>. Which of the following compounds has the highest % age of oxygen by weight?<\/strong><\/p>\n<ul>\n<li>CH<sub>3<\/sub> \u2013 OH<\/li>\n<li>C<sub>2<\/sub>H<sub>5<\/sub> \u2013 OH<\/li>\n<li>HCCOOH<\/li>\n<li>H<sub>2<\/sub>O<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>H<sub>2<\/sub>O<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#27<\/span>. A compound contains 50% sulphur and 50% oxygen by mass. The empirical formula of the compound is:<\/strong><\/p>\n<ul>\n<li>S<sub>2<\/sub>O<sub>3<\/sub><\/li>\n<li>SO<sub>3<\/sub><\/li>\n<li>SO<sub>2<\/sub><strong><br \/>\n<\/strong><\/li>\n<li>SO<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>SO<sub>2<\/sub><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#28<\/span>. Equal volumes of CO and N<sub>2<\/sub> are taken in identical conditions, The correct relationship between masses of two gases is?<\/strong><\/p>\n<ul>\n<li>CO &lt; N<sub>2<\/sub><\/li>\n<li>N &lt; CO<sub>3<\/sub><\/li>\n<li>CO = N<sub>2<\/sub><\/li>\n<li>All of these<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>CO = N<sub>2<\/sub><\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#29<\/span>. The technique that is not used to separate isotopes is:<\/strong><\/p>\n<ul>\n<li>Thermal diffusion<\/li>\n<li>Ultracentrifuge<\/li>\n<li>Distillation<\/li>\n<li>Extraction<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>Extraction<\/strong>\n\t\t\t<\/div><\/div>\n<p><strong><span style=\"color: #ff6600;\">Question#30<\/span>. Combustion analysis is performed for the determination of:<\/strong><\/p>\n<ul>\n<li>The molar mass of the compound<\/li>\n<li>The structural formula of the substance<\/li>\n<li>The empirical formula of the compound<\/li>\n<li>Mass of halogens present in an organic compound<\/li>\n<\/ul>\n<div class=\"clear\"><\/div><div class=\"toggle close\"><h3 class=\"toggle-head-open\">Answer<i class=\"fa fa-angle-up\"><\/i><\/h3><h3 class=\"toggle-head-close\">Answer<i class=\"fa fa-angle-down\"><\/i><\/h3><div class=\"toggle-content\">\n\t\t\t<strong>The empirical formula of the compound<\/strong>\n\t\t\t<\/div><\/div>\n<p>&nbsp;<\/p>\n\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Students can check Chemistry 1st Year Basic Concepts MCQs here for the preparation of Entry Test MCQs here. In Chemistry, the first thing which we study is an Atom. The shortest\/minor part of an element that takes part in a chemical reaction is an Atom. Then comes molecules, ions, and many others. Mass Spectrometry is &hellip;<\/p>\n","protected":false},"author":2,"featured_media":398,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/142"}],"collection":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/comments?post=142"}],"version-history":[{"count":0,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/posts\/142\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/media\/398"}],"wp:attachment":[{"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/media?parent=142"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/categories?post=142"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/talib.pk\/test-preparation\/wp-json\/wp\/v2\/tags?post=142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}