Methane contributes towards global warming so it i | Chemistry Questions & Answers

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

Explanation:

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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

Explanation:

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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

Answer & Explanation Answer: C) Capillary action

Explanation:

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Q:

The smell that we get when LPG cylinder leaks is due to the presence of

A) Nitrogen peroxide	B) Carbon monoxide
C) Sulphur compound	D) Carbon dioxide

A) poisonous	B) carcinogenic
C) infectious	D) greenhouse

Methane contributes towards global warming so it is called a _________________ gas.

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