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How are impurities in preparation of N2 from Nh4NO2 removed by passing through sulphuric acid and potassium Dichromate?

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In laboratory preparation of hydrogen, impurities of arsine and phosphine can be removed by passing it through which of the following solution?

Q. When sulphur dioxide is passed through potassium dichromate solution, the colour changes from to .

Q. The colour of potassium dichromate upon reaction with sulphuric acid changes from__

When potassium dichromate is treated with dilute sulphuric acid, it forms:

Q. Assertion :Chlorides are confirmed by the chromyl chloride test. Reason: When the salt is heated with potassium dichromate and concentrated sulphuric acid, red vapours of tetrachromyl chloride are produced.

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