359+ Important Chemistry MCQ Questions Answers

Q:

When formaldehyde and potassium hydroxide are heated , we get

A) Acetylene	B) Methyl alcohol
C) Methane	D) Ethyl formate

Answer & Explanation Answer: B) Methyl alcohol

Explanation:

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Q:

The M.K.S. system was first introduced by

A) archimedes	B) Eienstein
C) Newton	D) Giorgi

Answer & Explanation Answer: D) Giorgi

Explanation:

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Q:

' Yellow cake ' an item of smuggling across border s

A) A crude form of heroin	B) A crude form of cocaine
C) Uranium oxide	D) Unrefined gold

Answer & Explanation Answer: C) Uranium oxide

Explanation:

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Q:

Which one of the following is not a mixture

A) air	B) mercury
C) milk	D) cement

Answer & Explanation Answer: B) mercury

Explanation:

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Q:

Among the following the maximum covalent character is shown by the compound

(1) $M g C l_{2}$

(2) $F e C l_{2}$

(3) $S n C l_{2}$

(4) $A l C l_{3}$

A) Option 1	B) Option 2
C) Option 3	D) Option 4

Answer & Explanation Answer: D) Option 4

Explanation:

According to Fajans rule, cation with greater charge and smaller size favours covalency.

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Q:

The enzyme that converts glucose to ethyl alcohol is

A) Maltase	B) Zymase
C) Diastase	D) Invertase

Answer & Explanation Answer: B) Zymase

Explanation:

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Q:

A mixture of sand and naphthalene can be separated by

A) Fractional distillation	B) Sublimation
C) Chromatography	D) Any of them

Answer & Explanation Answer: B) Sublimation

Explanation:

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Q:

Sodium carbonate crystal lose water molecules this property is called

A) hygroscopy	B) deliquescence
C) efflorescence	D) None of these

Chemistry Questions

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