The process in which solid changes directly into vapours without passing through liquid state?

Related Mcqs:

1. The conversion of vapours back into their liquid state is called__________________?

   A. crystallization
   B. evaporization
   C. vaporization
   D. condensation

2. The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of__________________?

   A. vaporization
   B. evaporation
   C. crystallization
   D. sublimation

3. Formation of vapours from the surface of a liquid is called________________?

   A. vapourization
   B. evaporation
   C. condensation
   D. cracking

4. As a substance moves from a solid to a liquid all of the following changes occur except ?

   A. molecules become more disordered.
   B. K.E of the molecules decreases
   C. intermolecular forces become weaker.
   D. molecules move more frequently.

5. Direct conversion of solids into vapours is called ___________________?

   A. Solvent extraction
   B. sublimation
   C. crystallization
   D. vaporization

6. The partial pressure exerted by the water vapours is called_______________?

   A. Surface tension
   B. Aqueous tension
   C. Vapour pressure
   D. Hydraulic pressure

7. Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________?

   A. ionic substances
   B. metallic substances
   C. molecular solids
   D. covalent network solids

   Submitted by: Mansoor Ul Haque

8. Which has strongest bonding in the solid state ?

   A. Hydrogen Chloride (HCI)
   B. Chlorine (Cl2)
   C. Xenon(Xe)
   D. Sodium Chloride (NaCI)

9. For a given process the heat changes at constant pressure (qp) and at constant volume (qv) are related to each other as___________________?

   A. qp = qv
   B. qp < qv
   C. qp > qv
   D. qp = qv / 2

10. Arsenic oxides are removed by passing through_________________?

    A. Ferric hydroxide
    B. Sodium hydroxide
    C. Calcium hydroxide
    D. Aluminium hydroxide