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:

By volume, 78% of air is _______________

A) nitrogen	B) oxygen
C) hydrogen	D) helium

Answer & Explanation Answer: A) nitrogen

Explanation:

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Q:

Which of the following type of medicine is used for treating indigestion?

A) Antibiotic	B) Analgesic
C) Antacid	D) Antiseptic

Answer & Explanation Answer: C) Antacid

Explanation:

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Q:

Which of the following is a vertebrate?

A) Kiwi	B) Sponges
C) Star fish	D) Threadworm

Answer & Explanation Answer: A) Kiwi

Explanation:

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Q:

In which of the following solution the concentration of H+ ion is the maximum?

A) pH 6	B) pH 8
C) pH 5	D) pH 9

Answer & Explanation Answer: C) pH 5

Explanation:

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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

Explanation:

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Q:

What was the element used in traditional thermometers which is highly toxic in nature?

A) Carbon	B) Mercury
C) Arsenic	D) Cadmium

Answer & Explanation Answer: B) Mercury

Explanation:

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Q:

Which of the following states has the maximum area of Mangrove forest?

A) Rajasthan	B) Uttar Pradesh
C) Sikkim	D) West Bengal

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