1099+ Important Chemistry MCQ Questions Answers

Q:

Which of the following elements was the last element in Newland's Law of Octaves?

A) Thorium	B) Hydrogen
C) Rubidium	D) Bromine

Answer & Explanation Answer: A) Thorium

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Q:

Which compound is formed when a Magnesium ribbon is burnt in air?

A) Magnesium Nitrate	B) Magnesium Carbonate
C) Magnesium Oxide	D) Magnesium Nitride

Answer & Explanation Answer: C) Magnesium Oxide

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Q:

Given in the options are sets of particular characteristics of elements and how they vary across the period and down the group in the following format:

Characteristic of an element - Across the period - Down the group

A) Electropositive Character/metallic character - Increase - Decrease	B) Electropositive Character/metallic character - Increase - Increase
C) Electropositive Character/metallic character - Decrease - Increase	D) Electropositive Character/metallic character - Decrease - Decrease

Answer & Explanation Answer: C) Electropositive Character/metallic character - Decrease - Increase

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Q:

Which of the following is the most common kidney stone-forming compound?

A) Calcium oxalate	B) Magnesium oxide
C) Sodium bicarbonate	D) Magnesium citrate

Answer & Explanation Answer: A) Calcium oxalate

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Q:

What product is formed when electricity is passed through an aqueous solution of sodium chloride?

A) Sodium and Chlorine	B) Sodium oxide
C) Sodium hydroxide	D) Sodium and water

Answer & Explanation Answer: C) Sodium hydroxide

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Q:

Which among the following cannot be included among greenhouse gases?

A) Nitrous Oxide	B) Carbon Dioxide
C) Methane	D) Phosphine

Answer & Explanation Answer: D) Phosphine

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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

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Q:

Which of the following causes damage to bridges, iron railings and all objects made of metals?

A) Reduction	B) Rancidity
C) Acidity	D) Corrosion

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