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- Bleaching powder is used as for purification of water. a) Why is ble...
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- a) Which are the reactants used in the preparation of hydrogen in labo...
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- Mention two advantages of organic fertilisers.
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- The molecules of hydrogen and oxygen combined to form the new substanc...
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- In the laboratory preparation of chlorine , a) Why chlorine gas is pa...
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- Oxygen is prepare by heating of potassium permagnate. a) Write the c...
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- O, O2, O3 Various forms of oxygen are given above. a) Which among ...
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- Take a small quantity of sulphur in a spatula and burn it. a) Which s...
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- A product of industrial importance is prepared by passing a gas with g...
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- When potassium permaganate is heated strongly, oxygen gas is liberated...
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- Ozone layer ensures the protection of living beings from dangerous ult...
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- a) Which are the chemicals required for the preparation of chlorine in...
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- The element is essential for the growth of plants. a) Suggest any tw...
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- a) It is said that lightning is a blessing for plants. What could be t...
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- Find the gases for which the following statements are related: a) Bur...
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- Given below are certain uses of chlorine, oxygen, nitrogen and hydroge...
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- Classify the following reactions into combination,displacement,decom...
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- Excess use of C.F.C causes depletion of ozone layer. a) What is C.F....
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- Find the relation and fill in the blanks: Combustion gas: Hydrogen C...
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- Which element found more in stratosphere.
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