1099+ Important Chemistry MCQ Questions Answers

Q:

Which are two chemicals used to purify water?

A) Chlorine & Fluorine	B) Fluorine & Iodine
C) Chlorine & Hydrogen peroxide	D) Fluorine & Iodine

Answer & Explanation Answer: C) Chlorine & Hydrogen peroxide

Explanation:

Removing the contaminents if any in the water which causes harm to our health is involved in the purifying of water.

This process involves chemicals. Chloramines, Hydrogen peroxide, Iodine are the chemicals which are used in purifying water.

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Q:

What is the purpose of adding Gypsum to the cement?

A) For lubrication	B) To slow down its rate of setting
C) To increase its rate of setting	D) To make it strong

Answer & Explanation Answer: B) To slow down its rate of setting

Explanation:

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Q:

Which subatomic particle has a negative charge?

A) Neutron	B) Proton
C) Ion	D) Electron

Answer & Explanation Answer: D) Electron

Explanation:

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Q:

Dissolving is best described as

A) molecules breaking into ions	B) a change from a solid to a liquid
C) breaking covalent bonds	D) a mingling of molecules and/or ions

Answer & Explanation Answer: D) a mingling of molecules and/or ions

Explanation:

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Q:

Which of the following is a metal?

A) Sulphur	B) Nitrogen
C) Oxygen	D) No option is correct

Answer & Explanation Answer: D) No option is correct

Explanation:

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Q:

The purest form of iron is

A) wrought iron	B) steel
C) pig iron	D) nickel steel

Answer & Explanation Answer: A) wrought iron

Explanation:

Wrought Iron is the purest form of iron. It contains 0.12 to 0.25% carbon and so it is the purest form of iron.

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Q:

Which of the following is a property of an acid?

A) Acids reacts with metals	B) Acids taste sour
C) Acids turn blue litmus paper red	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

The general properties of acids are as follows :-

1.They are sour to taste.

2.They turn blue litmus paper red but the red litmus paper have no effect of acids and it remains unaffected.

3.They release hydrogen ions H+ in the solution medium, making the conditions acidic.

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Q:

Which of the statement(s) about the reaction given below is/are INCORRECT?

2PbO (s) + C (s) ⟶ 2Pb (s) + CO2 (g)

I. Lead is getting reduced.

II. Carbon is getting reduced.

III. Lead oxide is getting reduced.

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

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