West Bengal Police Constable Special Mock Test

Chemistry - States of Matter

1 / 10

1) Consider a sealed container filled with ice. Upon heating, how does the transition from solid to liquid and then to gas illustrate energy changes in the system?

A) Energy is released during both melting and vaporization.

B) Energy is released during melting and absorbed during vaporization.

C) Energy is absorbed during melting and released during vaporization.

D) Energy is absorbed during both melting and vaporization.

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2) Which of the following statements best describes the difference in molecular motion between the three states of matter?

A) In gases, molecules are stationary compared to the vibrational movement in liquids and solids.

B) In liquids, molecules are stationary, whereas in solids and gases they slide past each other.

C) In solids, molecules vibrate in place while in liquids they slide past each other and in gases they move freely.

D) In solids, molecules move freely while in liquids and gases they vibrate in place.

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3) Which of the following best describes the triple point of a substance?

A) The temperature and pressure at which only gas and liquid phases coexist.

B) The temperature and pressure at which only solid and gas phases coexist.

C) The temperature and pressure at which solid, liquid, and gas phases coexist in equilibrium.

D) The temperature and pressure at which only solid and liquid phases coexist.

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4) Why do solids have definite shapes while liquids do not?

A) Liquids are compressed more easily than solids.

B) Solids are heavier than liquids.

C) Liquids have stronger intermolecular forces.

D) Solids have stronger intermolecular forces limiting molecular movement.

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5) How does Dalton's Law relate to partial pressures in a gaseous mixture?

A) The total pressure is equal to the sum of the densities of the gases.

B) The total pressure is equal to the sum of the partial pressures of the gases.

C) The total pressure is the average of the partial pressures of the gases.

D) The total pressure is determined by the gas with the highest partial pressure.

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6) Which property of gases can be explained by Avogadro's Law?

A) Pressure changes with temperature.

B) The density of a gas is proportional to its molar mass.

C) Equal volumes of gases contain the same number of molecules at a given temperature and pressure.

D) Volume changes with pressure.

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7) How does Henry's Law apply to the solubility of gases?

A) The solubility of a gas increases with increasing pressure.

B) The solubility of a gas is independent of pressure.

C) The solubility of a gas decreases with increasing pressure.

D) The solubility of a gas increases with decreasing pressure.

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8) How does the Van der Waals equation adjust for real gas behavior?

A) By accounting for the volume occupied by gas molecules and intermolecular forces.

B) By assuming perfect elasticity of gas molecules.

C) By ignoring intermolecular forces.

D) By keeping temperature constant.

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9) What characteristic is indicated by the compressibility factor of gases?

A) It shows how incompressible a gas is.

B) It reflects the solubility of a gas.

C) It indicates how compressible a gas is compared to an ideal gas.

D) It indicates the boiling point of a gas.

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10) When a gas is compressed at constant temperature, why does its pressure increase according to kinetic molecular theory?

A) The volume of the gas increases.

B) Molecules move faster when compressed.

C) There is an increase in the average kinetic energy of molecules.

D) The number of molecular collisions per unit area increases.

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Curriculum

Chemistry (States of Matter )

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