Abhishek was given a salt ‘X’ for analysis which was white in colour. On strong heating it produced a yellow residue, a colourless gas, and also a reddish-brown gas. The solution of the salt ‘X’ when tested with excess of ammonium hydroxide produced a chalky white insoluble precipitate.
(a) Name the coloured gas evolved when Abhishek heated the salt strongly.
(b) Which cation was present in the sample given to Abhishek?
(c) Identify the salt given to Abhishek for analysis.
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(a) Nitrogen dioxide
Reason — The reddish-brown colour indicates that the gas is Nitrogen dioxide.
(b) Lead ion (Pb2+)
Reason — The chalky white insoluble precipitate with excess of ammonium hydroxide indicates that the cation present is Pb2+.
(c) Lead nitrate[Pb(NO3)2]
Reason — The given salt is a nitrate salt as nitrogen dioxide (NO2), is a common product obtained from heating nitrates. As the cation is lead, hence the salt is Lead nitrate.