Calcium chloride solution
Concentrated hydrochloric acid
Ethanol
Ethanedioc acid
Aqueous ammonia
Correct answer is E
No explanation has been provided for this answer.
Pipe-borne water is usually chlorinated in order to
improve the teste of the water
remove the hardness in the water clear
coagulate sediments in the water
kill harmful bacteria in the water
make the water clear and colourless
Correct answer is D
No explanation has been provided for this answer.
Substances which absorb water from the atmosphere without dissolving in it are sid to be
anhydrous
hygroscopic
insolube
hydrated
efflorescent
Correct answer is B
No explanation has been provided for this answer.
How many electrons are removed from Cr2- when it is oxidized to CrO42-?
0
2
4
8
10
Correct answer is D
From Cr2- to CrO42- involves 8 electrons to give oxidation state of Cr is +6
0.318g
0.635g
18g
6.35g
9.65g
Correct answer is A
Cu2+ + 2e- → Cu, From the equation 2 Faraday will liberate 63.5gm of copper The quantity of electricity passed (Q) Q = 1. 0 965 = 965 coulomb :. 2 x 96500 → 63.5, 965 → x. x = 965 / 2x96500 x 63.5 = 0.3175g \(\approx\) 0.328