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प्रश्न
Name a metal which is soft and a non-metal which is hard.
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उत्तर
Sodium is a soft metal, whereas diamond is a hard non-metal.
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संबंधित प्रश्न
Name the processes involved in two cases.
Name the terms for the particles of matter which may or may not have independent existence.
Name the terms for the change of vapour into a liquid.
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
One of the following represents the solution of solid in a solid. This one is :
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
How will you separate water from mustard oil ?
What is chromatography ? State its two applications.
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
Explain the meaning of the term ‘matter’.
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
Liquids cannot be compressed and they have fixed volume.
Intermolecular space is maximum in ______.
Examples of foam are ______.
