1. The temperature at which two or more than two types of crystals exists in equilibrium is called

    a. melting point
    b. transition temperature
    c. eutectic temperature
    d. boiling point

    c. eutectic temperature

    2. The solids in which atoms ions or molecules have random non-repetitive three dimensional arrangements are termed as

    a. crystals
    b. glasses
    c. alloys
    d. amalgams

    b. glasses

    3. The nature of bond in diamond is

    a. ionic
    b. covalent
    c. molecular
    d. metallic

    b. covalent

    4. Crystal lattice is an arrangement of particles in

    a. one dimension
    b. two dimension
    c. three dimension
    d. four dimension

    c. three dimension

    5. Lattice energy is also called

    a. crystal energy
    b. ionization energy
    c. energy of affinity
    d. bond energy

    a. crystal energy

    6. When gaseous ions are allowed to form a crystal, energy

    a. is absorbed
    b. is evolved
    c. is sometimes absorbed and sometimes released
    d. has no effect

    b. is evolved

    7. NaF and MgO have both atomic ratio 1:1 in their crystals, such property is

    a. polymorphism
    b. isomorphism
    c. isotropy
    d. allotropy

    b. isomorphism

    8. Electric current can pass through graphite in one direction but not through other direction of crystal, such property is called

    a. Allotropy
    b. Anisotropy
    c. Isomorphism
    d. Polymorphism

    b. Anisotropy

    9. Iron acts as electrical conductor due to

    a. electron cloud
    b. free protons
    c. free neutrons
    d. free ions

    a. electron cloud

    10. A crystal of purple compound potassium permanganate placed at the bottom of a beaker of water and the beaker left until there is no further change. What will be observed

    a. A uniformly purple solution
    b. A colorless liquid with the purple crystal unchanged
    c. A purple layer below a colorless layer
    d. A colorless layer below a purple layer

    a. A uniformly purple solution

    11. Which of following method is most suitable for obtaining a pure , dry sample of NaCl from a mixture of NaCl and sand

    a. Shake the mixture with water. Filter and dry the substances on the filter paper
    b. Shake the mixture with water. Filter and evaporate the filtrate
    c. Shake the mixture with water and distill off the sand
    d. Heat the mixture gently and collect the substances which boil off

    b. Shake the mixture with water. Filter and evaporate the filtrate

    12. Which method could be used to obtain copper from a mixture of pondered copper and sodium chloride

    a. heating the mixture
    b. fractional distillation of the mixture
    c. adding excess water to the mixture and filtering
    d. passing electric current to the mixture

    c. adding excess water to the mixture and filtering

    13. Lead and zinc can be separated by distillation because they have different

    a. boiling points
    b. densities
    c. mass numbers
    d. reactivities

    a. boiling points

    14. An insoluble solid was dropped into a measuring cylinder containing 50cm3 of water . What will be the effect on volume of water

    a. 15cm3
    b. 17cm3
    c. 50cm3
    d. 65cm3

    d. 65cm3

    15. The spontaneous mixing of particles is called

    a. evaporation
    b. sublimation
    c. diffusion
    d. boiling

    c. diffusion