Chemistry Questions

Q:

............ element is represented by the given symbol.

A) Hydrogen B) Mercury
C) Carbon D) Gold
 
Answer & Explanation Answer: B) Mercury

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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

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Q:

Phosphorus is kept in water because

A) its ignition temperature is very high B) its ignition temperature is very low 
C) its critical temperature is high D) its critical temperature is low
 
Answer & Explanation Answer: A) its ignition temperature is very high

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Q:

Oxide of which of the following will turn red litmus blue?

A) Magnesium B) Phosphorus
C) Sulphur D) Carbon
 
Answer & Explanation Answer: A) Magnesium

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Q:

Which of the following elements has the lowest melting point?

A) Titanium B) Tungsten
C) Argon D) Nickel
 
Answer & Explanation Answer: C) Argon

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Q:

Propyne and propene can be distinguished by

A) AgNO₃ in ammonia B) conc. H₂SO₄
C) dil. KMnO₄ D) Br₂ in CCl₄
 
Answer & Explanation Answer: A) AgNO₃ in ammonia

Explanation:

Propene, being an alkene, and propyne, being a alkyne, are distinguished using the common chemical tests namely ammoniacal silver nitrate or ammoniacal cuprous chloride. Ammoniacal silver nitrate is also called as Tollen's reagent.

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Q:

Highest percentage of carbon is found in which form of coal?

A) Anthracite B) Bituminous
C) Peat D) lignite
 
Answer & Explanation Answer: A) Anthracite

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Q:

Glycol is used to manufacture which of the following ?

A) Nylon B) Artificial silk
C) Terylene D) Rubber
 
Answer & Explanation Answer: C) Terylene

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