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Ammonia

State one obs...

Question

State one observation for the following:
Ammonia gas is passed over heated copper (II) oxide.

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Solution

$3 C u O (B l a c k) + 2 N H_{3} Δ - ---- \to 3 C u + N_{2} (R e d d i s h P i n k) + 3 H_{2} O$

The black colour copper oxide will change to reddish pink copper.

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Similar questions

Q. Give the balanced equation for the following conversions:
(i) Ammonia to nitrogen using an acidic gas.
(ii) Ammonia to nitrogen using copper oxide.
(iii) Ammonia to nitrogen using oxygen.
(iv) Ammonia to nitrogen trichloride.
(v) Ammonia to ammonium sulphate.
(vi) Ammonia solution to an amphoteric hydroxide.
(vii) Ammonia to ammonium carbonate.
(viii) Copper oxide to copper.

Q. What do you observe when
(i) Excess ammonia is mixed with chlorine.
(ii) Ammonia in excess is mixed with chlorine.
(iii) Filter paper dipped in colourless phenolphthalein is introduced into ammonia.
(iv) Ammonia is passed over heated lead oxide.
(v) Ammonia solution is added to ferric chloride solution.
(vi) Ammonia solution is added drop by drop and then in excess to aqueous copper sulphate solution.
(vii) Ammonia comes in contact with the eyes of a person.

Q. state your observation when ammonia gas is passed over black copper oxide

Pure Nitrogen can be obtained by passing ammonia vapours over heated copper (II) oxide $(C u O)$ .

Q. Why black coating on the surface of copper oxide turns brown when hydrogen gas is passed over heated copper oxide

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