Chemistry 1st Year States of Matter MCQs with Answers

There are 4 stats of Matter and we are studying the Chemistry 1st Year States of Matter MCQs with Answers here. In the gaseous state, the molecules are separated from each other by large empty spaces between them. There are several properties of all the matters. Gas laws explain different behaviors of gases. By combining these gas laws, we get the General Gas Equation that is PV=nRT. This equation is studied in Dalton’s law and it has several applications. Kinetic Molecular Theory of Gases explains the different properties of Gases. After this, we will study Liquids. The effects including Evaporation, Vapor Pressure, and Boiling are important here. There are different structures of Ice. In the end, the most important topic in Solids. There are different lattice structures of Solids studied here. So, this is the brief intro about 1st Year Chemistry Stats of Matter MCQs with Answers. Have a look at some important MCQs from this chapter.

Chemistry 1st Year States of Matter MCQs with Answers

KEY POINTS

 

Question#1. The number of molecules in 0.0112m³ of methane at 25°C and pressure of 760mm Hg is:

• 6.02 x 10²⁰
• 3.01 x 10¹²
• 6.02 x 10²³
• 3.01 x 10²³

Question#2. Which of the following will have the same number of molecules at STP:

• 280 cm³ of CO₂ and 280 cm³ of N₂O
• 44g of CO₂ and 11.2 dm³ CO
• 11.2 dm³ of O₂ and 32g of O₂
• 28g of N₂ and 5.6 dm³ of oxygen

Question#3. The partial pressure of oxygen in the lungs is:

• 159 torr
• 116 torr
• 760 torr
• 50 torr

Question#4. Gases deviate from ideal behavior at high pressure. Which of the following is correct for non-ideality:

• At high pressure, the gas molecules move in one direction only
• At high pressure, the collision between the gas molecules are increased manifold
• At high pressure, the volume of the gas becomes insignificant
• At high pressure, the intermolecular attractions become significant

Question#5. Evaporation is designated as a cooling process because of the reason:

• It is a surface phenomenon
• It involves heat absorption
• High energy molecules leave behind the low energy molecules and cause cooling
• All of the above

Question#6. Evaporating water depends upon the following:

• Surface area and intermolecular forces
• Speed of the air above the liquid surface
• Humidity in air
• All of these

Question#7. The vapor pressure of a liquid depends upon the following:

• Surface area and temperature only
• The volume of the liquid
• The humidity of the liquid in the air
• Temperature and the intermolecular forces

Question#8. At 1atm pressure, a liquid 1 has the boiling point less than a liquid 2, what can we predict about both the liquids:

• Liquid 1 has high vapor pressure than the liquid 2
• Liquid 1 has the weak intermolecular forces of attraction than the liquid 2
• Liquid 1 is more volatile than the liquid 2
• All of the above

Question#9. The strength of hydrogen bonding is:

• 20 times less than a covalent bond
• 20 times more than a covalent bond
• 20 times less than an ionic bond
• 20 times more than an ionic bond

Question#10. 110°C boiling water of water corresponds to the external pressure:

• Between 760 to 1200 torr
• 765 torr
• Between 200 to 760 torr
• Any value of pressure

Question#11. Lower alcohols in spite of being organic are soluble in water because:

• Intermolecular hydrogen bonding
• Dipole induced dipoles
• The low electronegativity difference between C and H
• All of the above

Question#12. Ammonia shows the maximum boiling point among the hydrides of the 5^th group because:

• Lone pair of electrons present on the nitrogen
• The very small size of nitrogen
• The pyramidal structure of ammonia
• The enhanced electro-negativity character of nitrogen

Question#13. Ice float on the liquid water because:

• The density of water is maximum at 4°C
• Water freezes at 0°C and is less dense than liquid water
• Ice occupies less volume than water at 0°C
• Both b and c

Question#14. Type of hybridization in diamond:

• sp
• sp²
• sp³
  
• No hybridization

Question#15. The overall structure of the diamond looks:

• Face centered cubic
• Square planner
• Tetragonal
• None of the above

Question#16. The graph between pressure and the inverse of volume at constant temperature and number of moles:

• Straight-line parallel to the x-axis
• Straight-line parallel to the y-axis
• Straight-line passing through the origin
• None of them

Question#17. If both temperature and volume of a gas are doubled, the pressure:

• Cannot be predicated
• Remain unchanged
• Is reduce to ½
• Is doubled

Question#18. In a closed vessel of 1000 cm³, H₂ gas is heated from 27°C to 127°C. Which statement is not correct?

• The rate of collision increases
• The pressure of gas increases
• The energy of gas molecules increases
• The number of moles of gas increases

Question#19. Which one is the form of a general gas equation?

• PV = nRT
• P₁V₁/T₁ = P₂V₂/T₂
• PV = RT
• All of these

Question#20. The sudden expansion of the gas from high pressure towards the low-pressure causes?

• Increase of temperature
• Decrease in temperature
• Greater number of confusions among the molecules
• Decrease of velocities of gas molecules

Question#21. The molecules of gas show more deviation from ideal behavior at low temperature, because;

• Kinetic energies
• Densities of the gases increase
• Collision become less frequent
• Attractive force dominate at low temperature

Question#22. Hydrogen bonding is extensively present in protein which forms the spiral. The hydrogen bond being produced is between.

• Nitrogen and the hydrogen atom
• Carbon and the hydrogen atom
• Oxygen and the hydrogen atom
• All of these possible

Question#23. Ice occupies more space than liquid water:

• 10%
• 11%
• 12%
• 9%

Question#24. The boiling point of H₂O is 100°C while that of C₂H₅OH is 78.5°C. The reason is that:

• H₂O molecules are small-sized
• The bond angles at the oxygen atom are different
• C₂H₅ group is electron-donating
• The number of hydrogen bonds per H₂O molecule is greater than C₂H₅-OH

Question#25. The distillation of a solution under reduced pressure is called?

• Fractional distillation
• Destructive distillation
• Distillation
• Vacuum distillation

Question#26. Which of the liquid has the lowest vapor pressure?

• Br₂
• H₂O
  
• Ether
• C₂H₅ – OH

Question#27. The boiling point of a compound is mostly raised by:

• Dipole induced dipole interaction
• London dispersion forces
• Intermolecular hydrogen bonding
• Intramolecular Hydrogen bonding

Question#28. The number of CI ions per unit cell of NaCl are:

• 6
• 4
  
• 2
• 8

Question#29. The crystal of diamond is:

• Ionic
• Molecular
• Covalent
• Metallic

Question#30. The crystals formed due to London forces of interaction are:

• Ionic
• Covalent
• Molecular
• Metallic

Question#31. Which one is false for evaporation:

• Surface phenomenon
• Continous
• Exothermic
• Cause Cooling

Question#32. The forces which are present between the ions and water molecules are known as:

• Dipole induced dipole forces
• Ion dipole forces
• Dipole-Dipole forces
• London dispersion forces

Question#33. The conversion of vapours back into their liquid state is called______.

• Crystallization
• Evaporation
• Vapourization
• Condensation

Question#34. The attractive forces between the partially positive end of one molecule and partial negative end of other molecules are called:

• Dipole-Dipole forces
• Ion Dipole-Dipole forces
• London dispersion forces
• Debye forces

Question#35. Which substance shows anisotropic behaviour in electrical conductivity?

• Diamond
• Graphite
• KCl
• Ice

Question#36. Molar heat of vaporization of water is:

• 40.7 kJ/mole
• 40.7 J/mole
• 40.7 cal/mole
• 40.7 kcal/mole

Question#37. Ice is _____ crystal.

• Metallic
• Molecular
• Covalent
• Ionic

Question#38. The number of amino acid units for each turn of helix, on average are:

• 21
• 23
• 25
• 27

Question#39. Which solids does not contain covalent bonds?

• Copper
• Diamond
• Graphite
• Ice

Question#40. Plastics are amorphous solids and:

• Have sharp melting points
• Undergo clean cleavage when cut with knife
• Do not undergo clean cleavage
• Possess oderly arrangement over long distances