A substance having very high vapour pressure at its melting point on heating will show_______________?

Related Mcqs:

1. 18g glucose is dissolved in 90g water the relative lowering in vapour pressure is equal to ___________________?

   A. 8
   B. 5.1
   C. 6
   D. one/fifty one

2. Vapour pressure is not affected by_______________?

   A. Surface area
   B. temperature
   C. intermolecular forces
   D. atmospheric pressure

3. The relative lowering of vapour pressure is_____________________?

   A. equal to the mole fraction of solvent
   B. equal to the mole fraction of solute
   C. directly proportional to the mole fraction of solute
   D. both B & C

4. The relative lowering of vapour pressure is directly proportional to molality if the solution is________________?

   A. concentrated
   B. dilute
   C. saturated solution
   D. all of the above

5. Across short period the melting and boiling point increase upto __________________?

   A. IIIA group
   B. IVA group
   C. VA group
   D. VIA group

6. The melting points and boiling points upto meddle of 3d- series ____________________?

   A. increases
   B. decreases
   C. remain same
   D. no regular trend

7. Melting points of VII-A group elements down the group ____________________?

   A. Increase
   B. Decrease
   C. Remain constant
   D. No regular trend

8. Which one of the followings possesses melting point below 0°C?

   A. Nitrogen
   B. Phosphorus
   C. Carbon
   D. Bismuth

9. In melting of iron, which of the following reactions takes place in Bladt Furnace at 400°C- 600°C________?

   A. CaO+ SiO2——> CaSiO3
   B. 2FeS+3O2——–> 2Fe+ SO2
   C. FeSiO3———> FeSiO3
   D. Fe2O3+ 3CO——–> 2Fe+ 3CO2

   Submitted by: Muhammad Ali Kunbhar

10. In crystallization if the solvent is inflammable then direct heating is________________?

    A. needed
    B. avoided
    C. depends on temperature
    D. crystallization does not involve heating