1099+ Important Chemistry MCQ Questions Answers

Q:

The magnetic moment (spin only) of $[N i C l_{4}]^{2 -}$ is

A) 1.41 BM	B) 1.82 BM
C) 5.46 BM	D) 2.82 BM

Answer & Explanation Answer: D) 2.82 BM

Explanation:

Hybridisation of Ni is $e^{-}$

Unpaired $3 d^{8}$ in is 2

So $Ω = \sqrt{n (n + 2)} B M = \sqrt{2 x 4} = \sqrt{8} = 2.82 B M$

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10 7681

Q:

A device used for the measurement of radioactivity is

A) mass spectrometer	B) cyclotron
C) nuclear reactor	D) G.M.counter

Answer & Explanation Answer: D) G.M.counter

Explanation:

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13 7607

Q:

Which one of the following is not radioactive

A) Astanine	B) Francium
C) Tritium	D) Zirconium

Answer & Explanation Answer: D) Zirconium

Explanation:

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13 7542

Q:

Safety matches contain

A) Sulphur	B) Phosphorus
C) Magnesium	D) Potassium

Answer & Explanation Answer: B) Phosphorus

Explanation:

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21 7493

Q:

Formation of curd from milk is chemical reaction.

A) TRUE

B) FALSE

Answer & Explanation Answer: A) TRUE

Explanation:

The process of conversion of milk into curd is called fermentation. It is a chemical change. Milk consists of globular proteins called casein. As the microorganism lactobacillus react with milk and turn it to curd. For it 37 degree temperature is needed. But sometimes when it does not get favourable condition, then other microorganism react and makes the curd taste different.

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6 7461

Q:

The percentage of nitrogen in the air is about

A) 74%	B) 76%
C) 78%	D) 80%

Answer & Explanation Answer: C) 78%

Explanation:

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Q:

Which of the following does not contain the material particles

A) alpha - rays	B) beta - rays
C) gamma - rays	D) anode rays

Answer & Explanation Answer: C) gamma - rays

Explanation:

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16 7451

Q:

Air ___________________ are the substances which contaminate the air.

A) Reactants	B) Irritants
C) Resistants	D) Pollutants

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