the density of oxygen is greater than that of air
the density of air is nearly the same as that of oxygen
oxygen is a component of air
air is an impure substance
Correct answer is B
Oxygen is collected in downward displacement of water because:-
nitrogen and carbondioxide
the rare gases
nitrogen and oxygen
nitrogen and the rare gases
Correct answer is D
The quick-lime is a drying agent that can dry most gases except ammonia. Hence it removes the water vapour. Quick-lime which is calcium oxide reacts with the carbon dioxide forming calcium carbonate. Hence carbon dioxide and monoxide is eliminated leaving nitrogen, and the rare gases
A balanced chemical equation obeys the law of
conservation of mass
definite proportions
multiple proportions
conservation of energy
Correct answer is A
No explanation has been provided for this answer.
I, II and III
I, II and IV
I and II only
I and IV
Correct answer is A
No explanation has been provided for this answer.
carbon(IV)oxide
carbon(ll)oxide
soda
glucose
Correct answer is A
No explanation has been provided for this answer.