Questions  

An inorganic compound 'A' shows the following reactions
i) It is white solid, exists as dimer and fumes in wet air
ii) It sublimes at 180⁰C and forms monomer if heated to 4000C
iii) Its aqueous solution turns blue litmus to red and gives a white precipitate with AgNO₃ solution which is soluble in NH₄OH
iv) Addition of NH₄OH and NaOH separately to the soltion of 'A' gives a gelatinous precipitate which in however soluble in excess of NaOH.
The compound 'A' is

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