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प्रश्न
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
उत्तर
A mixture of kerosene and petrol can be separated by fractional distillation.
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संबंधित प्रश्न
Name two processes which provide the best evidence for the motion of particles in matter.
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Name one solid, one liquid and one gaseous non-metal.
Which type of elements, metals or non-metals, show the property of brittleness ?
What is the other name for impure substances ? Give two examples of impure substances.
Give reason why copper metal is used for making electric wires.
Which of the following does not have a fixed melting point/boiling point ?
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Which of the two will scatter light : soap solution or sugar solution ? Why ?
What is the most common way of expressing the concentration of a solution ?
One of the following does not show Tyndall effect. This one is :
The dyes present in fountain pen ink can be separated by the technique of :
Explain the meaning of the term ‘matter’.
______ is not made of matter.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
Solids possess very high kinetic energy.
Which statement is not correct for a mixture
The movement of particles in liquids is ______.
Gases change to liquid by the process of ______.
Evaporation does form bubbles.
