1099+ Important Chemistry MCQ Questions Answers

Q:

In modern periodic table while going from top to bottom in a group ______.

A) size of an atom increases	B) size of an atom decreases
C) ionisation energy of an atom increases	D) size and ionisation energy of an atom increases

Answer & Explanation Answer: D) size and ionisation energy of an atom increases

Explanation:

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Q:

Rupee 5 and 10 coins are now made of

A) Ferritic stainless steel	B) Silver and steel
C) Cupro nickel alloy	D) Copper and brass

Answer & Explanation Answer: C) Cupro nickel alloy

Explanation:

The copper nickel alloys composed of copper with 25% nickel with 0.05-0.4% manganese is commonly used for the manufacture of coins, medals and other semi valuable applications.

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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:

Who first discovered the every eighth element had properties similar to that of the first?

A) Newlands	B) Moseley
C) Dobereiner	D) Mendeleev

Answer & Explanation Answer: A) Newlands

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Q:

Burning Magnesium ribbon produces white ash, which dissolves in water to form____.

A) Magnesium Halides	B) Magnesium Oxide
C) Magnesium Hydroxide	D) Magnesium Sulphate

Answer & Explanation Answer: C) Magnesium Hydroxide

Explanation:

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Q:

Fill in the blank with the most appropriate option.

An element attains stability when it achieves ________ state.

A) an only-duplet	B) an only-octet
C) a duplet or octet	D) a heptate

Answer & Explanation Answer: C) a duplet or octet

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Q:

Least distance of distinct vision for normal eye is

A) 15 cm	B) 20 cm
C) 25 cm	D) 30 cm

Answer & Explanation Answer: C) 25 cm

Explanation:

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Q:

Blotting paper absorbs ink due to

A) Coarse nature of paper	B) Osmosis
C) Capillary action	D) Siphoning

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