1099+ Important Chemistry MCQ Questions Answers

Q:

Which of the following is NOT a compound?

A) Ammonia	B) Milk
C) Sodiumchloride	D) Chalk

Answer & Explanation Answer: B) Milk

Explanation:

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Q:

Consider the following chemical reaction :

${aFe}_{2} O_{3} (s) + bCO (g) + cFe (s) + {dCO}_{2}$

In the balanced chemical equation of the above, which of the following will be the values of the coefficients a, b, c and d respectively?

A) 3, 2, 3, 1	B) 1, 3, 2, 3
C) 2, 3, 3, 1	D) 3, 3, 2, 1

Answer & Explanation Answer: B) 1, 3, 2, 3

Explanation:

Fe2O3 + 3CO = 2Fe + 3CO2

Hematite + Carbon Monoxide = Iron + Carbon Dioxide

In this reaction, the iron oxide is reduced to iron, and the carbon is oxidised to carbon dioxide.

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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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1 108256

Q:

Which of the following statements are CORRECT?

I. The soap molecules form structures called micelles.

II Soap micelles cannot scatter light.

III. Oily dirt gets collected in the center of the micelle.

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

Answer & Explanation Answer: B) Both I and III

Explanation:

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Q:

Which among the following noble gas has highest molar mass?

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

Answer & Explanation Answer: D) Xe

Explanation:

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Q:

Which of the following solutions is alkaline?

A) H+ <1 × 10-7 Mol/l	B) H+ = 1 × 10-4 Mol/l
C) H+ = 1 × 10-7 Mol/l	D) H+ > 1 × 10-7 Mol/l

Answer & Explanation Answer: A) H+ <1 × 10-7 Mol/l

Explanation:

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Q:

SnCl2 + 2HgCl2 ---> Hg2Cl2 + SnCl4

In the given reaction

A) HgCl2 is oxidised	B) SnCl2 is oxidised
C) Hg2Cl2 is oxidised	D) SnCl2 is reduced

Answer & Explanation Answer: B) SnCl2 is oxidised

Explanation:

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Q:

Atmosphere of Venus mostly contains which of the following gases?

A) Nitrogen	B) Hydrogen
C) Oxygen	D) Carbon dioxide

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