1099+ Important Chemistry MCQ Questions Answers

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

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:

For dilution of a concentrated acid, we should add:

A) water into the diluted acid	B) water into the concentrated acid
C) first water into the acid and then more acid into the water	D) concentrated acid into water

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