1099+ Important Chemistry MCQ Questions Answers

Q:

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

Answer & Explanation Answer: C) 804.32 g

Explanation:

$∆ T_{f} = k_{f} . m$

for ethylene glycol in aq. solution

$∆ T_{f} = k_{f} \frac{w}{m o l . w t} \times \frac{1000}{w t . o f s o l v e n t} 6 = \frac{1.86 x w x 1000}{62 x 4000}$

=> w = 800 g

So, the weight of solute should be more than 800 g.

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Q:

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is

1) $A_{2} B_{5}$

2) $A_{3} B_{2}$

3) $A_{2} B_{3}$

4) $A_{3} B_{4}$

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

Answer & Explanation Answer: A) Option 1

Explanation:

$Z_{A} = \frac{8}{8}$ ; $Z_{B} = \frac{5}{2}$

So formula of compound is $A B_{\frac{5}{2}}$

i.e., $A_{2} B_{5}$ .

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Q:

Which of the following carbon compounds is used as a fire- extinguisher?

A) Carbon disulphide	B) Chloroform
C) Carbon tetrachloride	D) Methyl ene chloride

Answer & Explanation Answer: C) Carbon tetrachloride

Explanation:

Vapour of carbon tetra chloride $(c c l_{4})$ is non-inflammable and is heavier than air. Hence it is used as a fire extinguisher under the trade name of pyrene.

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Q:

Most commonly used bleaching agent is

A) Chlorine	B) Alcohol
C) Carbon dioxide	D) Sodium Chloride

Answer & Explanation Answer: A) Chlorine

Explanation:

Chlorine is the most commonly used bleaching agent.

Bleaching agents are compounds which are used to remove color from substances such as textiles. A bleaching agent is a material that lightens or whitens a substrate through the chemical reaction. The bleaching reactions usually involve oxidative or reductive processes that degrade color systems.

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Q:

Which one of the following can be used to confirm wether drinking water contains a gamma emitting isotope or not

A) Microscope	B) Scintillation counter
C) Lead plate	D) pectrophotometer

Answer & Explanation Answer: B) Scintillation counter

Explanation:

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Q:

Positive ions are formed from neutral atoms by loss of

A) neutrons	B) protons
C) nuclear charge	D) electrons

Answer & Explanation Answer: D) electrons

Explanation:

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Q:

The particle with 13 protons and 10 electrons is

A) Al -atom	B) Al3+ ion
C) nitrogen isotope	D) None of these

Answer & Explanation Answer: B) Al3+ ion

Explanation:

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Q:

The Most Abundant Rare Gas in the Atmosphere is

A) Xe	B) He
C) Ne	D) Ar

Answer & Explanation Answer: D) Ar

Explanation:

Argon is most the most abundant Rare Gas in the atmosphere. Its elemental symbol is Ar.

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