1099+ Important Chemistry MCQ Questions Answers

Q:

Which among the following will be a negative ion?

A) If it has more electrons than protons	B) If it has more electrons than neutrons
C) If it has more protons than electrons	D) If it has more protons than neutrons

Answer & Explanation Answer: A) If it has more electrons than protons

Explanation:

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Q:

One turn of the citric acid cycle produces

A) two molecules of carbon dioxide are released	B) three molecules of NADH and one molecule of FADH2 are generated
C) one molecule of ATP or GTP is produced	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

One turn of the citric acid cycle produces

1. Two molecules of carbon dioxide are released.

2. One molecule of ATP or GTP is produced.

3. Tree molecules of NADH and one molecule of FADH2 are generated.

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Q:

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

A) Element with 18 neutrons and 20 protons	B) Element with 19 neutrons and 18 protons
C) Element with 19 neutrons and 20 protons	D) Element with 18 neutrons and 22 neutrons

Answer & Explanation Answer: D) Element with 18 neutrons and 22 neutrons

Explanation:

Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.

Mass number Electrons Neutrons

Calcium 40 20 20

Argon 40 18 22

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Q:

What is the chemical formula of aluminium nitride?

A) AlN	B) Al2N
C) AlN2	D) AlN3

Answer & Explanation Answer: A) AlN

Explanation:

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Q:

The complexity and variety of organic molecules is due to

A) their interaction with water	B) their tremendously large sizes
C) the chemical versatility of carbon atoms	D) the variety of rare elements in organic molecules

Answer & Explanation Answer: C) the chemical versatility of carbon atoms

Explanation:

The complexity and variety of organic molecules is due to the chemical versatility of carbon atoms.

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Q:

Infiltration is the process by which rainwater becomes

A) river water	B) ground water
C) salt water	D) ocean water

Answer & Explanation Answer: B) ground water

Explanation:

The process of absorbtion of rain water by the soil on the earth is called infiltration. By this process, the rain water that falls on the soil becomes ground water.

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Q:

Which among the following is false about alpha particles?

A) They have high ionizing power	B) They have high penetrating power
C) They have high kinetic energy	D) They are positively charged helium nuclei

Answer & Explanation Answer: B) They have high penetrating power

Explanation:

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Q:

At low temperature, Lead behaves as a :

A) Semi conductor	B) Super conductor
C) Insulator	D) Conductor

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