Which of these statement is true for sodium thiosulphate ?A. it acts as an antichlorB. it is used as an reducing agent in iodometric titration.C. it reacts with hydrochloric acid to form `SO_(2)` and sulphurD. it is used in photography as hypo to dissolves exess of AgBr as soluble complex.

Which of these statement is true for sodium thiosulphate ?A. it acts a

1.	Which of these statement is true for sodium thiosulphate ?A. it acts as an antichlorB. it is used as an reducing agent in iodometric titration.C. it reacts with hydrochloric acid to form `SO_(2)` and sulphurD. it is used in photography as hypo to dissolves exess of AgBr as soluble complex.
Answer» Correct Answer - ABCD (A) It removes the chorine from the surface of fibres (while deying) according to following reaction. `Na_(2)S_(2)O+4Cl_(2)+5H_(2)O to 2NaHSO_(4)+8HCl` Therefore, it is known as antichlor. (B)`I_(3)^(-)+S_(2)O_(3)^(2-) to 3I^(-)+S_(4)O_(6)^(2-)` (C ) `S_(2)O_(3)^(2-)+H^(+) to S darr ("white") +SO_(2)+SO_(2)+H_(2)O` ("disproportionation reaction"). `(D)2S_(2)O_(3)^(2-)+Ag^(+) to [Ag(S_(2)O_(3))_(2)]^(3-)` ("soluble complex") or `[Ag(S_(2)O_(3))_(3)]^(5-)` This reaction is utlized in photography where hypo is used as fixer.

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Which of these statement is true for sodium thiosulphate ?A. it acts as an antichlorB. it is used as an reducing agent in iodometric titration.C. it reacts with hydrochloric acid to form `SO_(2)` and sulphurD. it is used in photography as hypo to dissolves exess of AgBr as soluble complex.

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