1099+ Important Chemistry MCQ Questions Answers

Q:

Which one of the following is not a semiconductor?

A) Silicon	B) Germanium
C) Quartz	D) Gallium arsenide

Answer & Explanation Answer: C) Quartz

Explanation:

Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc. 2. Lattice structure and the atomic structure of constituent elements decide whether a particular material will be insulator, metal or semiconductor. Semiconductors are elemental (Si, Ge) as well as compound (GaAs, CdS, etc.). Silicon, Germanium, Gallium Arsenide are semiconductors, but Quartz is an insulator.

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Q:

Name the acid present in lemon.

A) Phosphoric acid	B) Carbonic acid
C) Citric acid	D) Malic acid

Answer & Explanation Answer: C) Citric acid

Explanation:

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Q:

The strongest interactions between molecules of hydrogen chloride are

A) dipole-dipole interactions	B) hydrogen bonds
C) covalent bonds	D) ionic bonds

Answer & Explanation Answer: A) dipole-dipole interactions

Explanation:

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Q:

Which of the following is the best fire-extinguisher?

A) Water	B) Oxygen
C) Carbon-dioxide	D) Soil

Answer & Explanation Answer: C) Carbon-dioxide

Explanation:

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Q:

What is the process of melting also called?

A) Fusion	B) Galvanisation
C) Crystallisation	D) Evaporation

Answer & Explanation Answer: A) Fusion

Explanation:

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Q:

Activated Charcoal is used to remove colouring matter from pure substances by_______

A) Bleaching	B) Oxidation
C) Adsorption	D) Reduction

Answer & Explanation Answer: C) Adsorption

Explanation:

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Q:

The oceanic crust mainly consists of silica and __________.

A) magnesium	B) iron
C) manganese	D) sulphur

Answer & Explanation Answer: A) magnesium

Explanation:

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Q:

The volume of 10 g of gas X is 5.6 litre at NTP. What is the molecular weight of X?

A) 40	B) 60
C) 50	D) 20

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