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When H2S is passed through Hg2S we get 
When H2S is passed through Hg2S we get a mixture of mercurous sulphide and mercury (Hg2S + Hg) .
How do we differentiate between Fe3+ and Cr3+ in group III?
When we add NH4Cl, it suppresses the ionisation of NH4OH and prevents the precipitation of higher group hydroxide in gp(III).
NOTE : Further ferric chloride and chromium chloride form different colour precipitates with NH4OH.
Which one of the following statements is correct ?
Between AgCl and AgI, AgI is less soluble, hence ammonia can dissolve ppt. of AgCl only due to formation of complex as given below: AgCl + 2NH3 → [Ag (NH3)2]Cl
The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is 
Prussian blue Fe4 [Fe(CN)6 ]3 is formed in lassaigne test for nitrogen.
The equation which is balanced and represents the correct product(s) is: [JEE M 2014]
The complex [CoCl(NH3)5]+ decomposes under acidic medium, so