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:

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

Explanation:

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Q:

What is the other name of sodium carbonate?

A) Baking soda	B) Washing soda
C) Baking powder	D) No option is correct

Answer & Explanation Answer: B) Washing soda

Explanation:

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Q:

Which one of the following is also regarded as Disguised unemployment?

A) Underemployment	B) Frictional unemployment
C) Seasonal unemployment	D) Cyclical unemployment

Answer & Explanation Answer: A) Underemployment

Explanation:

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Q:

West Bengal approved the construction of states 1st Deep Sea Port at

A) Udaipur	B) Digha
C) Bakkhali	D) Tajpur

Answer & Explanation Answer: D) Tajpur

Explanation:

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Q:

In which of the following the dominant phase is Gametophyte?

A) Bryophyta	B) Pteridophyta
C) Gymnosperms	D) Angiosperms

Answer & Explanation Answer: A) Bryophyta

Explanation:

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Q:

Which cricket player recently became the 6th Indian to take 300 wickets in test cricket?

A) Bhuvanesh Kumar	B) Jasprit Bumrah
C) Ishant Sharma	D) Ravichandran Ashwin

Answer & Explanation Answer: C) Ishant Sharma

Explanation:

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Q:

Which of the following is the cleanest source of energy?

A) Biofuel	B) Fossil fuel
C) Nuclear power	D) Wind energy

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