Problem 4 . A gas 1 (a compound of one of the elements of group VI) was bubbled

Question

Problem 4.

A gas 1 (a compound of one of the elements of group VI) was bubbled into a solution of common monopositive hydroxide 2 to give a solution of the salt 3. The cation of 2 gives a precipitate with the tetraphenylborate ion. Heating yellow solid 4 with a solution of 3 and evaporating the water gives crystals containing anion 5. Addition of iodine to a solution of containing anion 5gives iodide ion and a solution of anion 6. Addition of H+(acidification) to a solution of anion 5 initially produces acid 5, which then slowly decomposes to form solid 4 and gas 1. Gas 1, in turn, can be treated with a gas 7 resulting in low-melting solid 8, which vigorously reacts with water to give common strong acid. Identify all compounds from 1 to 8 and write appropriate confirmatory reactions.

Group VI: O, S, Se, Te, Po

Explanation / Answer

The only element which is gas among O, Se , Te Po is : Oxygen

The compounds will be

H2S + NaOH --> Na2S

So 1=H2S

2=NaOH

3=Na2S

Na+ + tetraphenylborate ion --> tetraphenylborate-Na+

But from where you get compound 4, not clear

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