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प्रश्न
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
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उत्तर
- Elements: An element is a substance made up of one type of atom.
(a) sodium, (d) silver, (f) tin, (g) silicon - Compounds: A compound is a substance made up of two or more types of atoms that are chemically bonded together to form molecules.
(e) Calcium carbonate, (k) methane, (j) soap, (l) carbon dioxide - Mixtures: A mixture is a combination of substances that are not chemically bonded together.
(c) Sugar solution, (b) soil, (i) air, (h) coal, (m) blood
संबंधित प्रश्न
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
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.
Name the property which enables metals to be drawn into wires.
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Which of the following are compounds ?
- CO
- No
- NO
- Co
Which one of the following is not a metalloid ?
In what respects does a true solution differ from a colloidal solution ?
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Explain what happens when a beam of light is passed through a colloidal solution.
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
The dyes present in fountain pen ink can be separated by the technique of :
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Liquids have ______.
Define the term matter.
Define the term matter.
