Metallurgy and Salt Analysis
|(Column A)||(Column B)|
Out of the following two (a and b) reasons which is/are true for the above observation?
(a) Metal nitrates are highly unstable.
(b) Metal nitrates are highly soluble in water.
|Column I||Column II|
Roasting of sulphides gives the gas X as a by-product. This is a colorless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is:
Assertion : Nitriding is a process of heating steel in an atmosphere of nitrogen.
Reason : Steel becomes brittle after nitriding.
Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is
KCN K2SO4 (NH4)2C2O4 NaCl Zn(NO3)2 FeCl3 K2CO3 NH4NO3 LiCN
Reason Transparent bead (NaBO2 + B2O3) forms coloured bead with coloured cation.
A solution of colorless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colorless salt (s) H is (are)
(i) On passing H2S, we get a black precipitate of (C), which dissolves only in aqua regia. On extraction and reaction with SnCl2, a greyish white precipitate is obtained.
(ii) On treatment with ammonium hydroxide, a reddish brown precipitate (D) is obtained.
The sodium extract of the solution gives the following tests:
(i) On reaction with AgNO3, it gives a yellow precipitate which is insoluble in NH3.
(ii) On shaking with FeCl3 and CCl4, a violet colouration in CCl4 layer is obtained.
Mixture on performing flame test gives lilac colour. Identify the compounds (A), (B), (C) and (D).