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- The bacteria called …................living in the roots of some plant...
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- The element found more on earth.
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- The density of hydrogen is …...........than air
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- A gas was formed when zinc reacted with dilute hydrochloric acid. a...
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- Find the odd one and give reason: a) Compost, Ammonia, Urea, Factump...
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- A burning candle kept on the table is covered with a glass tumbler. ...
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- a) Write a method of preparation of hydrogen in laboratory. b) How w...
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- a)Some chemicals are given in the box .find out the substances require...
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- If hydrogen is used as a fuel, environmental pollution can be overcome...
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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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