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 Chemistry Questions

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Q:

Atomic explosion is triggered by

A) thermo nuclear reaction B) chemical reaction
C) controlled chain reaction D) uncontrolled chain reaction
 
Answer & Explanation Answer: D) uncontrolled chain reaction

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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:

Crystallisation is an example of?

A) Physical Change B) Chemical Change
C) Chemical Reaction D) Galvanisation
 
Answer & Explanation Answer: A) Physical Change

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Q:

Oxide of which of the following will turn red litmus blue?

A) Magnesium B) Phosphorus
C) Sulphur D) Carbon
 
Answer & Explanation Answer: A) Magnesium

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Q:

Beryl is an ore/mineral of

A) Nickel B) Beryllium
C) Lead D) Tin
 
Answer & Explanation Answer: B) Beryllium

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Q:

Which drug is used for Pain Relief?

A) Risedronate B) Tramadol
C) Folic Acid D) Bupropion
 
Answer & Explanation Answer: B) Tramadol

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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 water treatment plant, use of chloramines ensures __________

A) taste and odour control B) weed control in reservoirs
C) disinfection D) removal of permanent hardness
 
Answer & Explanation Answer: C) disinfection

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