1.

Sodium thiosulphate can be prepared by

Answer»

Boiling `Na_(2)SO_(3)` solution with sulphur in acidic MEDIUM
Boling an aqueous solution of NAOH with sulphur
Neutralising `H_(2)SO_(4)` with NaOH
Boiling `Na_(2)SO_(3)` with sulphur in alkaline medium

Solution :Choice (b) is correct
When sulphur is boiled in aqueous NaOH then sodium THIOSULPHATE and sodium sulphide are formed
`4S + 6NaOH to Na_2S_2O_(3) + 2Na_(2)S + 3H_(2)O`
Choice (d)is also correct becausewhen sulphur is boiled with sodium sulphite, then sodium thiosulphate is formed
`Na_(2)SO_(3) + S to Na_(2)S_(2)O_(3)`


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