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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:

The atoms of the elements having same difference between mass number and atomic number are called ______.

A) Isobar B) Isotopes
C) Isotones D) No option is correct
 
Answer & Explanation Answer: C) Isotones

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Q:

Nitrification is the biological process of converting

A) N2 into nitrate B) N2 into nitrite
C) Ammonia into nitrite D) Ammonia into N2
 
Answer & Explanation Answer: C) Ammonia into nitrite

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Q:

Soft drinks contain:

A) Oxalic acid B) Tartaric acid
C) Carbonic acid D) Citric acid
 
Answer & Explanation Answer: C) Carbonic acid

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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:

Who formulated ‘the atomic theory’ of a matter?

A) Avogadro B) Dalton
C) Newton D) Pascal  
 
Answer & Explanation Answer: B) Dalton

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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:

In the reaction H2O2 + Cl2 -----> 2HCl + O2, H2O2 acts as

A) an acid B) an oxidising agent
C) a reducing agent D) a base
 
Answer & Explanation Answer: C) a reducing agent

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