Chemistry - Study Mode

[#386] The major constituent of air is
Correct Answer

(B) nitrogen
(E) Nitrogen

Explanation

Solution: Below a height of about 86 kilometers, the three main gaseous elements, which together account for about 99.9% of the total atmosphere, exist in essentially constant proportion to the total: nitrogen comprises 78% of air by volume, oxygen comprises 21% of air by volume, and argon comprises another 0.9%.

[#387] The main chemical constituent of clay is
Correct Answer

(D) aluminium silicate

Explanation

Solution: Aluminium silicate is the main Chemical constituent of clay.

[#388] The mineral containing both magnesium and calcium is
Correct Answer

(D) dolomite

Explanation

Solution: The mineral containing both magnesium and calcium is
Dolomite.

[#389] The metal does not give H 2 on treatment with dilute HCL is
Correct Answer

(C) Ag

Explanation

Solution: The metal does not give H2 on treatment with dilute HCL is Ag.

[#390] The number of g-molecule of oxygen in 6.02 x 10 24 CO molecules is
Correct Answer

(C) 5 gram of molecule

Explanation

Solution: In this question gram molecules simply means number of moles of O 2 molecules. So we have 6.02*10^24 atoms of Oxygen means 3.01*10^24 molecules of O 2 . 3.01*10^24 molecules of O 2 are equal to 5 moles . Source : Quora.com