Practice Pakistan's most useful MCQs for competitive exams

S.T.P. corresponds to _________________?

• (A)  1 atm. absolute pressure & 15.5°C
• (B)  760 mm Hg gauge pressure & 15.5°C
• (C)  760 torr & 0°C
• (D)  101.325 kPa gauge pressure & 15.5°C

Answer

Submitted By :Ali Uppal

The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is ____________________?

• (A)  15.5
• (B)  16
• (C)  16.5
• (D)  17

Answer

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If pH value of a solution is 8, then its pOH value will be ____________________?

• (A)  6
• (B)  1
• (C)  7
• (D)  10

Answer

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Average molecular weight of air is about ____________________?

• (A)  21
• (B)  29
• (C)  23
• (D)  79

Answer

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Which of the following is not a unit of kinematic viscosity ?

• (A)  Poise
• (B)  Stoke
• (C)  cm2/second
• (D)  None of these

Answer

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Isotopes are atoms having the same _____________________?

• (A)  Mass number
• (B)  Number of neutrons
• (C)  Atomic mass
• (D)  None of these

Answer

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The heat capacity of most substances is greater for the _______________ state?

• (A)  Solid
• (B)  Liquid
• (C)  Gaseous
• (D)  None of these

Answer

Submitted By :Ali Uppal

The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is_________________?

• (A)  0.4
• (B)  0.6
• (C)  0.8
• (D)  0.2

Answer

Submitted By :Ali Uppal

A sugar solution containing _________________ percent sugar is equivalent to 1 Brix?

• (A)  0.01
• (B)  0.1
• (C)  1
• (D)  10

Answer

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Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is___________________?

• (A)  1/9
• (B)  8/9
• (C)  1/2
• (D)  5/9

Answer

Submitted By :Ali Uppal