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Melamine Resin

phosphoric ac...

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phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides.why? refer exemplar problem

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Q. Assertion :Aqueous solution of hydrogen peroxide is kept in the glass or metal container containing some urea or phosphoric acid. Reason: Urea or phosphoric acid acts as a negative catalyst for the decomposition of hydrogen peroxide.

Q. The catalyst present in the decomposition of hydrogen peroxide is ferrous sulphate or phosphoric acid or both?

Q. (a) Why is high temperature avoided in the preparation of hydrogen chloride from sodium sulphate and concentrated sulphuric acid?
(b) Sodium chloride is preferred for the preparation of HCI. Why? [2 MARKS]

Which metal is preferred for preparation of hydrogen

(i) from water ?

(ii) from acid ?

In the preparation of hydrogen chloride from sodium chloride and sulphuric acid, the sulphuric acid used should be concentrated

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