Practice Pakistan's most useful MCQs for competitive exams

Which of the following is not a macromolecule ?

• (A)  sand
• (B)  haemoglobin
• (C)  diamond
• (D)  maltose

Answer

Submitted By :Ali Uppal

Percentage of calcium in calcium carbonate is___________________?

• (A)  80%
• (B)  30%
• (C)  40%
• (D)  20%

Answer

Submitted By :Ali Uppal

How many isotopes have odd atomic number ?

• (A)  154
• (B)  280
• (C)  86
• (D)  300

Answer

Submitted By :Ali Uppal

The number of moles of CO2 which contains 16 g of oxygen is__________________?

• (A)  0.25
• (B)  0.5
• (C)  0.75
• (D)  1

Answer

Submitted By :Ali Uppal

The volume occupied by 2.8 g of N2 at STP______________________?

• (A)  2.24 dm3
• (B)  22.4 dm3
• (C)  1.12 dm3
• (D)  112 dm3

Answer

Submitted By :Ali Uppal

Which one of the following is not the mono isotopic element ?

• (A)  arsenic
• (B)  uranium
• (C)  iodine
• (D)  nickel

Answer

Submitted By :Ali Uppal

Which of the following terms is used for the mass of chlorine 35.5 ?

• (A)  relative atomic mass
• (B)  mass number
• (C)  atomic weight
• (D)  relative isotopic mass

Answer

Submitted By :Ali Uppal

Size of molecule depends upon________________?

• (A)  Atomicity
• (B)  Shape of molecule
• (C)  Both A and B
• (D)  Difficult to predict

Answer

Submitted By :Ali Uppal

Avogadros number may represent_________________?

• (A)  volume of particles
• (B)  number of particles
• (C)  mass of particles
• (D)  All of the above

Answer

Submitted By :Ali Uppal

The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer_________________?

• (A)  Gas
• (B)  Liquid
• (C)  Volatile solid
• (D)  All

Answer

Submitted By :Ali Uppal