1
Q:

In addition to nitric acid, another acid which may render iron passive is 

A) acetic acid B) oxalic acid
C) chromic acid D) citric acid

Answer:   C) chromic acid

Explanation:

Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive. 

Subject: Chemistry
Q:

Brass gets discoloured in air because of the presence of which of the following gases in air  ?

A) Hydrogen sulphide B) Oxygen
C) Nitrogen D) Carbon dioxide
 
Answer & Explanation Answer: A) Hydrogen sulphide

Explanation:
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Q:

Which of the following is a non metal that remains liquid at room temperature  ?

A) Chlorine B) Phosphorous
C) Bromine D) Helium
 
Answer & Explanation Answer: C) Bromine

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Q:

Permanent hardness of water is due to the presence of  ? 

A) Calcium sulphate B) Calcium bicarbonate
C) Sodium bicarbonate D) Magnesium bicarbonate
 
Answer & Explanation Answer: A) Calcium sulphate

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2 166
Q:

Select the correct statement (s).

A) When energy is transferred to the system from the surrounding as work, the surrounding do work on the system and the value of work (W) positive. B) When energy is transferred from the system to the surrounding as work, work is done on the surrounding and the value of W is negative.
C) Both (A) and (B) D) None of the above
 
Answer & Explanation Answer: C) Both (A) and (B)

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Q:

Triple point of water corresponds to

A) 1 atm, 0°C B) 1 atm, 0.01°C
C) 1 atm, 0 K D) 4.58 Torr, 0.01°C
 
Answer & Explanation Answer: D) 4.58 Torr, 0.01°C

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