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Chemistry MCQ Questions with answers

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Learn Chemistry MCQs [Page 1 of Department 11]

2) Electromagnetic radiation with maximum wavelength is

(A) ultraviolet
(B) radio waves
(C) x-rays
(D) infrared
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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3) Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to

(A) dehydration
(B) oxidation
(C) reduction
(D) dehydrogenation
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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5) With reference to metals and their ores, which of the following pairs is INCORRECT?

(A) Aluminium (Al) - Cryolite
(B) Mercury (Hg) - Greenockite
(C) Cobalt (Co) - Smelite
(D) Gold (Au) - Calaverite
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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6) An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number

(A) 25
(B) 27
(C) 35
(D) 43
Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

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7) Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at –6°C will be: (Kf  for water = 1.86 Kg/mol and molar mass of ethylene glycol = 62 kg/mol)

(A) 204.60 g
(B) 304.30 g
(C) 804.32 g
(D) 400.00 g
Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

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8) Positive ions are formed from neutral atoms by loss of

(A) neutrons
(B) protons
(C) nuclear charge
(D) electrons
Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

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10) An element which is preserved under water is 

(A) sodium
(B) sulphur
(C) red phosphorus
(D) white phosphorus
Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

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