MCQs with Solutions for all Competitive Examinations

Chemistry MCQs for Competitive Examination

Q. 1
Rusting is 

(A) Electrolysis
(B) Oxidation
(C) Redox reaction
(D) Reduction

Answer: (B) Oxidation

Q. 2
What is dry ice?

(A) Solid Carbon dioxide
(B) Solid Nitrogen dioxide
(C) Solid Sulphur dioxide
(D) Solid Water

Answer: (A) Solid Carbon dioxide

Q. 3
Who discovered X rays?

(A) W. C. Rontgen
(B) Marie Curie
(C) Henri Becquerel
(D) Samuel T Cohen

Answer: (A) W. C. Rontgen

Q. 4
Which metal is responsible for Itai-Itai disease?

(A) Cadmium
(B) Nickel
(C) Chromium
(D) Mercury

Answer: (D) Mercury

Q. 5
Which of the following metal is generally used for making the filaments of a bulb?

(A) Iron
(B) Gold
(C) Silver
(D) Tungsten

Answer: (D) Tungsten

Q. 6
pH of human blood is

(A) Slightly basic
(B) Slightly acidic
(C) Highly acidic
(D) Highly basic

Answer: (A) Slightly basic

Q. 7
Which of the following is an Inert gas?

(A) Hydrogen
(B) Nitrogen
(C) Oxygen
(D) Argon

Answer: (D) Argon

Q. 8
Process of loosing electrons is known as

(A) Oxidation
(B) Reduction
(C) Radiation
(D) Both Oxidation and Reduction

Answer: (A) Oxidation

Q. 9
Which of the following is the major cause of Acid Rain?

(A) Carbon dioxide
(B) Carbon monoxide
(C) Nitrogen dioxide
(D) Oxygen

Answer: (C) Nitrogen dioxide

Q. 10
Ozone is an________of Oxygen. (Fill in the blanks)

(A) Allotrope
(B) Isotope
(C) Isobar
(D) Isotone

Answer: (A) Allotrope

Q. 11
Which of the following bonds is weakest in nature?

(A) Single bond
(B) Double bond
(C) Triple bond
(D) Hydrogen bond

Answer: (D)Hydrogen bond

Q. 12
Which gas in its solid sate is also known as dry ice?

(A) Nitrogen 
(B) Carbon dioxide
(C) Hydrogen
(D) Oxygen

Answer: (B) Carbon dioxide

Q. 13
The atomic bomb is based on the principle of 

(A) Controlled nuclear fusion
(B) Uncontrolled nuclear fusion
(C) Controlled nuclear fission
(D) Uncontrolled nuclear fission

Answer: (A) Uncontrolled nuclear fission

Q. 14
SMOG is a combination of 

(A) Air and water vapour
(B) Water and smoke
(C) Smoke and fog
(D) Smoke and water vapour

Answer: (C) Smoke and fog

Q. 15
What is contained in Chlorophyll?

(A) Potassium
(B) Sodium
(C) Manganese
(D) Magnesium

Answer: (D) Magnesium

Q. 16
What is the purest form of Carbon?

(A) Charcoal
(B) Anthracite
(C) Graphite
(D) Lampblack

Answer: (B) Anthracite

Q. 17
Curie is a unit of 

(A) Radioactivity
(B) Thermodynamic Temperature
(C) Luminous Intensity
(D) Amount of substance

Answer: (A) Radioactivity

Q. 18
Which of the following is used to extinguish a fire?

(A) Hydrogen
(B) Carbon Monoxide
(C) Carbon Dioxide
(D) Marsh gas

Answer: (C) Carbon dioxide

Q. 19
Chemical name of Quartz is 

(A) Calcium phosphate
(B) Calcium oxide
(C) Sodium Phosphate
(D) Sodium silicate

Answer: (D) Sodium silicate

Q. 20
Which of the following is the cleanest source of energy?

(A) Biofuel
(B) Fossil fuel
(C) Nuclear power
(D) Wind energy

Answer: (D) Wind energy

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