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Q:

What is the chemical formula of Ozone?

A) O B) O2
C) O3 D) O4
 
Answer & Explanation Answer: C) O3

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Q:

Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic table?

A) Scandium B) Gallium
C) Titanium D) Germanium
 
Answer & Explanation Answer: B) Gallium

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Q:

CuO + H2 ---> Cu + H2O. This equation is an example of

A) Oxidation B) Decomposition
C) Reduction D) Redox
 
Answer & Explanation Answer: D) Redox

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Q:

Two or more elements combine to form a

A) atom B) valency
C) compound D) radical
 
Answer & Explanation Answer: C) compound

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Q:

Which of the following elements has a total of 3 shells with 8 electrons in the last orbit?

A) Ar B) P
C) S D) Al
 
Answer & Explanation Answer: A) Ar

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Q:

What is an endothermic reaction?

A) Reaction in which heat is released. B) Reaction in which heat is absorbed.
C) Reaction in which neither heat is released nor absorbed. D) None of these
 
Answer & Explanation Answer: B) Reaction in which heat is absorbed.

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Q:

Why does carbon tetrachloride have no dipole moment?

A) Because of same size of carbon and chlorine atoms B) Because of regular tetrahedral structure
C) Because of planar structure D) Because of similar electron affinities of carbon and chlorine
 
Answer & Explanation Answer: B) Because of regular tetrahedral structure

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Q:

Who stated the following law : 'The properties of the elements are the periodic function of their atomic masses'?

A) Dobereiner B) Moseley
C) Newlands D) Mendeleev
 
Answer & Explanation Answer: D) Mendeleev

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