Covalent network crystals have_____________?

Related Mcqs:

1. Which of the solid does not contain covalent bond__________________?

   A. copper
   B. ice
   C. diamond
   D. graphite

2. Which of the solid does not contain covalent bond________________?

   A. Copper
   B. Ice
   C. Diamond
   D. Graphite

3. Which one of the following has polar covalent bond ?

   A. HF
   B. CH4
   C. H2
   D. N2

4. Metallic crystals are soluble in________________?

   A. Polar solvent
   B. Non polar solvent
   C. Fused metal
   D. None

5. Safe and the most reliable method of drying crystals is through_________________?

   A. Filter paper
   B. Vacuum desiccators
   C. Oven
   D. None of these

6. Crystals of Na2CO3. 10H2O when exposed to air_________________?

   A. Lose water and remain solid
   B. Gain water and remain solid
   C. Gain water and become liquid
   D. Remains unchanged

7. Aqueous solution of borax above 62°C gives crystals of________________?

   A. Na2B4O7.4H2O
   B. Na2B4O7.5H2O
   C. Na2B4O7.2H2O
   D. Na2B4O7.10H2O

8. In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen?

   A. 4
   B. 2
   C. 1
   D. 6

9. 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

10. Which law states that the rate of the effusion of a gas is inversely proportional to the square root of its density?

    A. Graham’s Law
    B. Gay-Lussac’s law
    C. Boyle’s law
    D. None of these

    Submitted by: Malik Asghar Hussain