Matter in our surroundings class 9 notes
Important and Best Chemistry Notes
Matter in Our Surroundings class 9 notes are available in this article. These MCQs and Chemistry Notes have been designed for the best possible training and cover all of the chapter’s relevant topics.
1.The space between the molecules of hydrogen gas would increase when :-
(i) Some hydrogen gas leaking out of the container
(ii) Increasing pressure on hydrogen contained during a closed container
(iii) Increasing the quantity of the container of hydrogen gas
(iv) Adding more hydrogen gas to the container without increasing the quantity of the container
(a) (i) and (iii)
(b) (i) and (iv)
c. (ii) and (iii)
(d) (ii) and (iv)
Answer — (a) (i) and (iii)
2.When a gas jar with crammed with air is placed the incorrect high on a gas jar crammed with bromine vapors , the red-brown vapors of bromine from the lower jar go upward into the jar containing air. In this experiment:
a. Air is heavier than bromine
b. Both air and bromine have an equivalent density
c. Bromine is heavier than air
d. Bromine cannot be heavier than air because it’s going upwards against the gravity
Answer- c. Bromine is heavier than air
3.Which one among the subsequent statements isn’t true?
a. The molecules which are in a solid vibrate about a fixed position
b. The molecules which are during a liquid are arranged during a regular pattern
c. The molecules which are during a gas exert negligibly small forces on one another , except during collisions
d. The molecules of a gas occupy all the space available
Answer- b. The molecules which are during a liquid are arranged during a regular pattern
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