The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise?

Related Mcqs:

1. Melting of wax is accompanied with ______________ in entropy?

   A. Increase
   B. Decrease
   C. No change
   D. None of these

2. For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?

   A. Sodium chloride
   B. Sodium carbonate monohydrate
   C. Anhydrous sodium sulphate
   D. Hypo

3. Change of state namely evaporation condensation, freezing and melting is an _______________ process?

   A. Isothermal
   B. Adiabatic
   C. Isobaric
   D. Isochoric

4. Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant ‘K’ is____________________?

   A. 10 atm-1
   B. 105 atm-1
   C. 10 (dimensionless)
   D. 105 (dimensionless)

5. 500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be _____________ mm Hg?

   A. 650
   B. 700
   C. 600
   D. 375

6. The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________________?

   A. 0.07
   B. 0.09
   C. 0.11
   D. 0.13

7. At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to___________________?

   A. Decrease in mean free path
   B. Increased collision rate among molecules
   C. Increase in molecular attraction
   D. Increase in average molecular speed

8. Melting of ice exemplifies a/an______________________?

   A. Adiabatic process
   B. Endothermic reaction
   C. Exothermic reaction
   D. Process involving a chemical reaction

9. Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?

   A. Entropy
   B. Internal energy
   C. Enthalpy
   D. Gibbs free energy

10. One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one ________________?

    A. Hour
    B. Day
    C. Minute
    D. Second