info@jobexams.pk
Job Exams Hero

Chemistry MCQs

Prepare for competitive exams with our topic-wise Chemistry MCQs covering fundamental and advanced concepts. These multiple-choice questions include atomic structure, chemical bonding, periodic table, acids & bases, organic chemistry, thermodynamics, chemical equations, mole concept, electrochemistry, and biochemistry. Ideal for science students and job aspirants appearing in PPSC, FPSC, CSS, NTS, SPSC, BPSC, KPSC, ETEA, AJKPSC, and other testing services. A valuable resource for teachers, educators, and candidates targeting science educator posts, laboratory roles, and general science sections in public sector exams.

Browse Categories
Quick Results 0 found

Question Coming Soon!

"" isn't in our database yet, but we're adding new questions daily.

1 Inorganic Chemistry MCQs

The only non-metal that exists in liquid state is ?

  • Chlorine
  • Iodine
  • Bromine
  • Fluorine
0 Comments
Correct Answer: C. Bromine

Explanation:

Non-metals are generally gases (like oxygen, nitrogen, chlorine) or solids (like sulfur, iodine, ... Read More Details

2 Inorganic Chemistry MCQs

Z number for chlorine is ?

  • 17
  • 35
  • 18
  • 16
0 Comments
Correct Answer: A. 17

Explanation:

The Z number of an element represents its atomic number, which is defined ... Read More Details

3 Physical Chemistry MCQs

Law of mass action was proposed by Goldberg and Peter Waage in ?

  • 1819
  • 1864
  • 1882
  • 1905
0 Comments
Correct Answer: B. 1864

Explanation:

The Law of Mass Action is one of the most important principles in ... Read More Details

4 Inorganic Chemistry MCQs

The product of the reaction between steam and a hydrocarbon in the presence of a nickel (Ni) catalyst at 900°C is ?

  • CO₂ + O₂
  • CO + H₂ (Water gas)
  • CO₃ + H₂O
  • Laughing Gas
0 Comments
Correct Answer: B. CO + H₂ (Water gas)

Explanation:

When a hydrocarbon reacts with steam in the presence of a nickel (Ni) ... Read More Details

5 Physical Chemistry MCQs

The decomposition of nitroglycerine is an example of:

  • Self-catalytic reaction
  • Enzyme-catalytic reaction
  • Autocatalytic reaction
  • Induced catalysis
0 Comments
Correct Answer: C. Autocatalytic reaction

Explanation:

The decomposition of nitroglycerine (C₃H₅N₃O₉) is a classic example of an autocatalytic reaction. ... Read More Details

6 Physical Chemistry MCQs

The phenomenon of negative catalysis is also known as:

  • Auto catalysis
  • Self catalysis
  • Inhibition
  • Enzyme catalysis
0 Comments
Correct Answer: C. Inhibition

Explanation:

In chemical kinetics, a catalyst is a substance that increases the speed of ... Read More Details

7 Physical Chemistry MCQs

Ostwald’s dilution law is applicable to:

  • All electrolytes
  • Strong electrolytes
  • Non-electrolytes
  • Weak electrolytes
0 Comments
Correct Answer: D. Weak electrolytes

Explanation:

Ostwald’s dilution law explains the relationship between the dissociation constant (Ka or Kb), ... Read More Details

8 Analytical Chemistry MCQs

The best indicator for titrating HCl with NH₄OH is?

  • Methyl orange
  • Litmus
  • Phenol red
  • Phenolphthalein
0 Comments
Correct Answer: A. Methyl orange

Explanation:

In acid–base titration, the choice of indicator depends on the strength of the ... Read More Details

9 Physical Chemistry MCQs

Species that are formed in one step of a reaction mechanism and used up in another step are called:

  • Catalyst
  • Intermediate
  • Inhibitor
  • Activated complex
0 Comments
Correct Answer: B. Intermediate

Explanation:

In chemical kinetics, a reaction mechanism is the step-by-step sequence of elementary reactions ... Read More Details

10 Inorganic Chemistry MCQs

Transition temperature for tin grey & tin white is: ?

  • 128.15°C
  • 18°C
  • 246.12°C
  • 96°C
0 Comments
Correct Answer: B. 18°C

Explanation:

Tin (Sn) is a chemical element that exists in different allotropic forms depending ... Read More Details

Question Categories
General Knowledge Category MCQ'S
Computer Category MCQ'S
Chemistry Category MCQ'S
Pak Departmental Laws & Rules MCQs