31. Which of the following is not used for computing latent heat of vaporisation?
Clausius-Clayperon equation
Reference substance plots based on Durhing & Othmer plots
Kistyakowasky’s equation
Hess
✅ The correct answer is option D.
Statiometery MCQs
32. The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be
2M
M/2
M
M/4
✅ The correct answer is option A.
33. The temperature of a gas in a closed container is 27° C. If the temperature of the gas is incresed to 300° C, then the pressure exerted is
Doubled
Halved
Trebled
Unpredictable
✅ The correct answer is option D.
34. In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the
Solute concentration
Temperature
Both A & B
Neither A nor B
✅ The correct answer is option C.
35. The combustion equations of carbon and carbon monoxide are as follows: C + O₂ = CO₂, ΔH = – 394 kJ/kg . mole CO + 1/2 O₂ = CO₂, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is __________ kJ/kg. mole.
-109.5
109.5
180
100
✅ The correct answer is option A.
36. At what temperature, given mass of a gas that occupies a volume of 2 litres at N.T.P. will occupy a volume of 4 litres, if the pressure of the gas is kept constant?
273°C
273°K
100°C
200°C
✅ The correct answer is option A.
37. If pH value of a solution is 8, then its pOH value will be
6
1
7
10
✅ The correct answer is option A.
38. An ideal gas can be liquified, because
Its molecular size is very small
Its critical temperature is more than 0°C
Forces operative between its molecules are negligible
It gets solidified directly without becoming liquid
✅ The correct answer is option C.
39. Heat of reaction is a function of the
Pressure
Temperature
Both(a)&(b)
Neither (a) nor (b)
✅ The correct answer is option C.
40. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
Same elevation in boiling point
Different elevation in boiling point
Elevation in boiling point in the ratio of their molecular weights
None of these
✅ The correct answer is option A.