Chemistry MCQs for Competitive Examination
Q. 1
Rusting is
(A) Electrolysis
(B) Oxidation
(C) Redox reaction
(D) Reduction
Answer: (B) Oxidation
Explanation:
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
Explanation:
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
Explanation:
Q. 4
Which metal is responsible for Itai-Itai disease?
(A) Cadmium
(B) Nickel
(C) Chromium
(D) Mercury
Answer: (D) Mercury
Explanation:
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
Explanation:
Q. 6
pH of human blood is
(A) Slightly basic
(B) Slightly acidic
(C) Highly acidic
(D) Highly basic
Answer: (A) Slightly basic
Explanation:
Q. 7
Which of the following is an Inert gas?
(A) Hydrogen
(B) Nitrogen
(C) Oxygen
(D) Argon
Answer: (D) Argon
Explanation:
Q. 8
Process of loosing electrons is known as
(A) Oxidation
(B) Reduction
(C) Radiation
(D) Both Oxidation and Reduction
Answer: (A) Oxidation
Explanation:
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
Explanation:
Q. 10
Ozone is an________of Oxygen. (Fill in the blanks)
(A) Allotrope
(B) Isotope
(C) Isobar
(D) Isotone
Answer: (A) Allotrope
Explanation:
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
Explanation:
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
Explanation;
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
Explanation:
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
Explanation:
Q. 15
What is contained in Chlorophyll?
(A) Potassium
(B) Sodium
(C) Manganese
(D) Magnesium
Answer: (D) Magnesium
Explanation:
Q. 16
What is the purest form of Carbon?
(A) Charcoal
(B) Anthracite
(C) Graphite
(D) Lampblack
Answer: (B) Anthracite
Explanation:
Q. 17
Curie is a unit of
(A) Radioactivity
(B) Thermodynamic Temperature
(C) Luminous Intensity
(D) Amount of substance
Answer: (A) Radioactivity
Explanation:
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
Explanation:
Q. 19
Chemical name of Quartz is
(A) Calcium phosphate
(B) Calcium oxide
(C) Sodium Phosphate
(D) Sodium silicate
Answer: (D) Sodium silicate
Explanation:
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
Explanation: