Heavy water is obtained by
a) Boiling water
b) Fractional distillation of water
c) Prolonged electrolysis of water
d) Heating water
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On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and brown gas (X) is formed.
(a) 2Cu(NO3)2 → 2CuO+ 4NO2+O2 (b) The brown gas 'X' has to be nitrogen dioxide. (c) This type of reaction falls under the category of Decomposition reactions. (d) The pH of the aqueous...
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It is possible to obtain oxygen from air by fractional distillation because
(c) Air is liquified by making use of the joule-Thompson effect (cooling by expansion of the gas) Water vapour and CO2 are removed by solidification. The remaining major constituents of...
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The sensation of fatigue in the muscles after prolonged strenuous physical work is caused by
(d) Fatigue is caused by excess anaerobic metabolism, which results in production of excess lactic acid. This lactic acid causes the muscle pain.
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Explain ,why an organic liquid vapourises at a temperature below its boiling point in steam distillation?
Because for boiling to occur vapour pressure of organic compound & steam should be equal to atmospheric pressure. As vapour pressure of water is higher than organic liquid. Therefore, organic...
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Two liquids (A) and (B)are separated by fractional distillation, the boiling point of (A) is less than (B).
The liquid (a) comes out first in distillate. On boiling the vapours of lower boiling component are formed first.
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A liquid with high boiling point decomposes on simple distillation but it can be steam distilled for its purification .Explain how is it possible?
In steam, distillation boiling occurs when the vapour pressure of organic compound & steam becomes equal to atmospheric pressure. As vapour pressure of water is higher than the organic liquid....
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2 g of lead, nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. Now answer the following :
(i) Brown fumes. white residue. (ii) Decomposition reaction 2Pb(NO3)2 →2PbO+4NO2+O2
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Why is it not possible to obtain pure ethanol by fractional distillation?
The solution or mixture having same composition in liquid as well as in vapour phase and boils at a constant temperature is known as azeotropes. Due to constant composition it...
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Explain why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged use?
To increase friction to make it more effective for grinding again.
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