Practice Pakistan's most useful MCQs for competitive exams

The temperature of a gas in a closed container is 27° C. If the temperature of the gas is increased to 300° C, then the pressure exerted is___________________?

• (A)  Doubled
• (B)  Halved
• (C)  Trebled
• (D)  Unpredictable

Answer

Submitted By :Ali Uppal

A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2; then the partial pressure of N2 in the mixture will be _____________ kgf/cm2 ?

• (A)  1
• (B)  2
• (C)  4
• (D)  8

Answer

Submitted By :Ali Uppal

Hess’s law of constant heat summation is based on conservation of mass. It deals with ___________________?

• (A)  Equilibrium constant
• (B)  Reaction rate
• (C)  Changes in heat of reaction
• (D)  None of these

Answer

Submitted By :Ali Uppal

In a neutral solution _________________?

• (A)  H+ ions are absent
• (B)  OH- ions are absent
• (C)  Both H+ and OH- ions are present in very small but equal concentration
• (D)  None of these

Answer

Submitted By :Ali Uppal

Number of gm moles of solute dissolved in one liter of a solution is called its____________________?

• (A)  Equivalent weight
• (B)  Molarity
• (C)  Molality
• (D)  Normality

Answer

Submitted By :Ali Uppal

A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is__________________?

• (A)  0.16
• (B)  0.33
• (C)  0.66
• (D)  0.47

Answer

Submitted By :Ali Uppal

Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?

• (A)  Sv
• (B)  1/St
• (C)  St
• (D)  1/Sv

Answer

Submitted By :Ali Uppal

The value of gas constant ‘R’ is ______________ kcal/kg.mole.°C?

• (A)  2.79
• (B)  1.987
• (C)  3.99
• (D)  None of these

Answer

Submitted By :Ali Uppal

In a binary liquid system, the composition expressed as _______________ is independent of the temperature & pressure?

• (A)  Kg of solute/kg of solvent
• (B)  Kg-mole of solute/kg-mole of solvent
• (C)  Kg-mole of solute/1000 kg of solvent
• (D)  All

Answer

Submitted By :Ali Uppal

Unit of mass velocity is___________________?

• (A)  kg/m.hr
• (B)  kg/m2.hr
• (C)  kg/hr
• (D)  kg/m2

Answer

Submitted By :Ali Uppal