Practice Pakistan's most useful MCQs for competitive exams

Which molecule has the highest bond energy among the halogens_________________?

• (A)  Fluorine
• (B)  Chlorine
• (C)  Iodine
• (D)  Bromine

Answer

Submitted By :Ali Uppal

The most reactive allotropic form of phosphorus is________________?

• (A)  White
• (B)  Redox potential
• (C)  Black
• (D)  Violet

Answer

Submitted By :Ali Uppal

Which is carnalite________________?

• (A)  KCI
• (B)  NaCI
• (C)  KCI MgCl2 6H2O
• (D)  Na2CO3. 10H2O

Answer

Submitted By :Ali Uppal

A safe and more reliable method for drying the crystal is__________________?

• (A)  Hot air currents
• (B)  folds of filter paper
• (C)  oven
• (D)  Vacuum desiccator

Answer

Submitted By :Ali Uppal

A limiting reactant is one which________________?

• (A)  is taken in lesser quantity in grams as compared to other reactants
• (B)  is taken in lesser quantity in volume as compared to other reactants
• (C)  gives the maximum amount of the product which is required
• (D)  gives the minimum amount of the product under consideration

Answer

Submitted By :Ali Uppal

Which element has same isotopes like palladium___________________?

• (A)  Nickel
• (B)  Calcium
• (C)  Cadmium
• (D)  Tin

Answer

Submitted By :Ali Uppal

The number of atoms in a molecule determines________________?

• (A)  macromolecule
• (B)  macromolecule
• (C)  molecularity
• (D)  atomicity

Answer

Submitted By :Ali Uppal

The mass of one mole of electron is________________?

• (A)  1.008
• (B)  0.55
• (C)  0.184
• (D)  1.637

Answer

Submitted By :Ali Uppal

Chlorination of water may be harmful if the water contains_________________?

• (A)  Ammonia
• (B)  Dissolved oxygen
• (C)  Carbon dioxide
• (D)  All

Answer

Submitted By :Ali Uppal

Which one of the following fertilizers provides the nitrogen and phosphorus to the plant ?

• (A)  Urea
• (B)  Calcium superphosphate
• (C)  Diammonium phosphate
• (D)  Potassium nitrate

Answer

Submitted By :Ali Uppal