Practice Pakistan's most useful MCQs for competitive exams

The heat of solution depends upon the____________________?

• (A)  Nature of solvent
• (B)  Concentration of solution
• (C)  Nature of solute
• (D)  All

Answer

Submitted By :Ali Uppal

In a chemical process, the recycle stream is purged for______________________?

• (A)  Increasing the product yield
• (B)  Enriching the product
• (C)  Limiting the inerts
• (D)  Heat conservation

Answer

Submitted By :Ali Uppal

Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?

• (A)  Chlorine
• (B)  Nitrogen
• (C)  Ethane
• (D)  All the gases will have the same KE

Answer

Submitted By :Ali Uppal

If 1 Nm3 of O2 contains ‘N’ number of molecules, then number of molecules in 2Nm3 of SO2 will be_________________?

• (A)  N
• (B)  N/2
• (C)  2N
• (D)  4N

Answer

Submitted By :Ali Uppal

The heat capacity of a substance is ____________________?

• (A)  Greater for liquid state than for solid state
• (B)  Lower for liquid state than for gaseous state
• (C)  Higher for solid state than for liquid state
• (D)  Equal for solid and liquid states below melting point

Answer

Submitted By :Ali Uppal

The total number of atoms in 8.5 gm of NH3 is _______________ × 1023?

• (A)  9.03
• (B)  3.01
• (C)  1.204
• (D)  6.02

Answer

Submitted By :Ali Uppal

As per Kirchhoff s equation, the heat of reaction is affected by the__________________?

• (A)  Pressure
• (B)  Volume
• (C)  Temperature
• (D)  Molecularity

Answer

Submitted By :Ali Uppal

A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container___________________?

• (A)  Will be greater than 298 K
• (B)  Will be 298 K
• (C)  Will be less than 298 K
• (D)  Cannot be determined

Answer

Submitted By :Ali Uppal

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________________?

• (A)  2M
• (B)  M/2
• (C)  M
• (D)  M/4

Answer

Submitted By :Ali Uppal

Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg?

• (A)  80.38
• (B)  80
• (C)  79.62
• (D)  78.51

Answer

Submitted By :Ali Uppal