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Punjab (PTB) · Chapter test · Free

1st Year Chemistry Chapter 5 TestStates and Phases Of Mater

30 marks · 40 minutes · 21 questions. Covers: CHAP 5: States and Phases Of Mater.

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1st Year Chemistry Chapter 5 Test

1st Year · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. If absolute temperature of a gas is double and the pressure is reduced to one half, the volume of the gas will:

    1. Remain unchanged

    2. Increase four times

    3. Reduce to

    4.  Be doubled

  2. Which one of the following have lowest vapour pressure at 25oC?

    1. Water

    2. Ethyl alcohol

    3. Acetone

    4. Diethyl ether

  3. When the external pressure is 23.7 torr, boiling point of water is:

    1. 25 oC

    2. 100 oC

    3. 98 oC

    4. 200oC

  4. State of matter has property of compressibility and expansion is:

    1. solid

    2. liquid

    3. gas

    4. plasma

  5. In smectic liquid crystal phases, in layers molecules also exhibit:

    1. No orientational order

    2. Short-range positional order

    3. Long-range orientational order

    4. Random orientations

  6. What is numerical value of R when its unit is JK-1 mol-1?

    1. 0.0821

    2. 8.314

    3. 1.987

    4. 62.4

  7. If a physical and chemical change takes place at constant pressure then heat change during this process is called:

    1. Heat of fusion

    2. Heat of atomization

    3. Enthalpy change

    4. all of these

  8. Which type of intermolecular force is present in all types of molecule regardless of their polarity?

    1. Dipole-dipole forces

    2. Hydrogen bonds

    3. London dispersion forces

    4. Ion-dipole forces

  9. A small insect can walk on the surface of water, and if the same insect tried to walk on the surface of ethanol then:

    1. The insect would walk with greater ease due to less resistance

    2. The insect would still walk with the same ease

    3. The insect may sink as the surface tension is not strong

    4. The insect would experience a change in its apparent weight

  10. Substance has a diffused melting point:

    1. Crystalline solid

    2. Amorphous solid

    3. Metallic solid

    4. Covalent solid

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. How do you differentiate between crystalline solids and amorphous solids?

  2. Why does wind increase the rate of evaporation of a liquid?

  3. London dispersion forces are weaker than dipole-dipole forces. Why?

  4. Diffusion and flow in liquids are entirely unrestricted, or are they influenced by the intermolecular forces present?

  5. In a closed container,if the teperature of the container increased,how will this equilibrium shift, and what will be the effect on the vapor pressure of the liquid?

  6. Why does rubbing alcohol feel significantly colder on the skin than water?

  7. Discuss two significant consequences of the lower density of ice compared to liquid water in natural environments.

  8. The boiling point of water is different at Murree hills and at Mount Everest.

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. In a laboratory experiment,150 cm3 of a volatile liquid was completely vaporized at 98 oC and a pressure of 1.01 x 105 pa.The mass of the vapor was found to be 0.495 g.Determine the molecular mass of the liquid (R=8.314 JK-1 mol-1).

  2. Discuss the structural changes when water turns into ice. Justify the empty spaces in its crystals as compared to H2O at 4ºC and lower density of ice.

  3. What is the boiling point? How it related to bapour pressure and kinetic energy? Explain the factors that effect boiling point.