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प्रश्न
A substance has neither a fixed shape nor a fixed volume. State whether it is a solid, a liquid or a gas.
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उत्तर
Gases have neither a fixed shape nor a fixed volume; they acquire the shape and volume of the vessel in which they are kept.
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संबंधित प्रश्न
The mass per unit volume of a substance is called density.
(density = mass/volume).
Arrange the following in order of increasing density-
air, exhaust from chimneys, honey, water, chalk, cotton and iron.
Name the three states of matter. Give one example of each.
Give one example of diffusion of gases in a liquid.
Explain why, when a bottle of perfume is opened in a room, we can smell it even from a considerable distance.
Explain why, diffusion occurs more quickly in a gas than in a liquid.
When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment :
The space between ______ particles is the greatest one.
Comment upon the following:-
filling a gas container
Explain why?
- A gas fills a vessel completely?
- Camphor disappears without leaving any residue.
Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel. The wt. of A is 0.50 g and that of B is 0.2 g. The total pressure of the mixture is 750 mm. The partial pressure of the gases B is ______ mm Hg.
