Chemistry - Study Mode

[#366] Mixture can be
Correct Answer

(C) Both A and B

Explanation

Solution: Mixture can be homogeneous and heterogeneous.

[#367] Which one out of the following helps in burning ?
Correct Answer

(A) Oxygen

Explanation

Solution: Oxygen helps in burning.

[#368] Except mercury which is the other metal that is liquid at standard conditions for temperature and pressure?
Correct Answer

(B) Bromine

Explanation

Solution: Bromine is the other metal that is liquid at standard conditions for temperature and pressure.

[#369] Which among the following metals provides amphoteric oxide ?
Correct Answer

(C) Aluminium

Explanation

Solution: In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid and as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide.

[#370] Impure camphor is purified by
Correct Answer

(A) Sublimation

Explanation

Solution: Sublimation apparatus is a piece of laboratory glassware used in the technique of sublimation usually used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface, leaving the non-volatile residue impurities behind. This cooled surface often takes the form of a cold finger. Once heating ceases and the vacuum is released, the sublimed compound can be collected from the cooled surface. Impure camphor is purified by this process.