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Q:

Number of Sigma and Pi bonds in benzene, respectively is

A) 12 and 3 B) 3 and 3
C) 6 and 3 D) 9 and 3
 
Answer & Explanation Answer: A) 12 and 3

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Q:

In the Modern Periodic Table, elements are arranged in

A) increasing atomic mass number B) increasing atomic number
C) decreasing atomic mass number D) decreasing atomic number
 
Answer & Explanation Answer: B) increasing atomic number

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Q:

The credit for classifying the elements on the basis of their atomic masses goes to

A) John Dalton B) John Alexander Reina Newlands
C) Dmitri Mendeleev D) Johann Wolfgang Dobereiner
 
Answer & Explanation Answer: C) Dmitri Mendeleev

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Q:

Which one of the following statements is correct?

A) The oxidation number for hydrogen is always zero. B) The oxidation number for hydrogen is always + 1.
C) The oxidation number for hydrogen is always -1. D) Hydrogen can have more than one oxidation number.
 
Answer & Explanation Answer: D) Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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Q:

Acid Rain has pH value of

A) 5.5 or less B) 12.5 or more
C) 10.5 or more D) 8.5 or more
 
Answer & Explanation Answer: A) 5.5 or less

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Q:

The number of free electrons in the outermost shell of carbon atoms in diamand is

A) zero B) two
C) four D) three
 
Answer & Explanation Answer: A) zero

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Q:

The process of reducing the milk fat globules size to allow them to stay evenly distributed in milk is called ____.

A) Standardization B) Pasteurization
C) Homogenization D) Fortification
 
Answer & Explanation Answer: C) Homogenization

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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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