1099+ Important Chemistry MCQ Questions Answers

Q:

Which process is not associated with mechanical weathering?

A) reactions with oxygen	B) frost wedging
C) biological oxygen activity	D) unloading

Answer & Explanation Answer: A) reactions with oxygen

Explanation:

The process that occurs when physical forces break rock into smaller pieces without changing the rock's chemical composition is called mechanical weathering.

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Q:

If the electronic configuration of elements A and B are $1 S^{2}, 2 S^{2} 2 P^{6}, 3 S^{1} and 1 S^{2}, 2 S^{2} 2 P^{6}, 3 S^{2} 3 P^{4}$ respectively, then the formula of the compound formed by the combination of these elements will be:

A) AB3	B) AB2
C) A2B	D) AB

Answer & Explanation Answer: C) A2B

Explanation:

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Q:

All isotopes of the same element have ____________

A) different atomic numbers and different atomic mass	B) different atomic numbers and the same atomic mass
C) the same atomic number but different atomic masses	D) the same atomic number and the atomic mass

Answer & Explanation Answer: C) the same atomic number but different atomic masses

Explanation:

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Q:

Which one of the following elements has the lowest atomic mass?

A) Lithium	B) Nitrogen
C) Hydrogen	D) Helium

Answer & Explanation Answer: C) Hydrogen

Explanation:

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Q:

Atomic mass of Carbon is 12 and that of Helium is 4. State which of the following statements is true for 1 mole of each of the elments?

A) 1 mole of Helium will contain 3 times more atoms than 1 mole of Carbon	B) 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium
C) 1 mole of Carbon will contain one-third the number of atoms present in 1 mole of Helium	D) 1 mole of Carbon will contain 3 times more atoms than 1 mole of Helium

Answer & Explanation Answer: B) 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium

Explanation:

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Q:

When electricity is passed through an aqueous solution of Sodium Chloride (brine), it decomposes to form.

A) NaOH + H2 + Cl2	B) NaOH + H2 + O2
C) NaOH + HCl + H2	D) NaOH + H2 + N2

Answer & Explanation Answer: A) NaOH + H2 + Cl2

Explanation:

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Q:

When milk becomes sour, ___ is produced.

A) Lactose	B) Lactic acid
C) Salicylic acid	D) Linoleic acid

Answer & Explanation Answer: B) Lactic acid

Explanation:

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Q:

Ice floats on water because its density is

A) more than water	B) zero
C) less than water	D) same as water

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