Assertion :An aqueous solution of sodium thiosulphate on acidification turns milky white. Reason: Colloidal sulphur is formed during acidification of an aqueous solution thiosulphate.

Read the above assertion and reason and choose the correct option regarding it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Option (A) is correct.
A mild reducing agent is used for sensitized silver bromide.
The unreacted is treated with sodium thiosulphate (hypo) to give a soluble complex.
$A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$
An aqueous solution of sodium thiosulphate on acidification turns milky white because colloidal sulphur is formed.
$N a_{2} S_{2} O_{3} + 2 H C l \to 2 N a C l + H_{2} O + S O_{2} + S$

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Assertion :An aqueous solution of sodium thiosulphate on acidification turns milky white. Reason: Colloidal sulphur is formed during acidification of an aqueous solution thiosulphate.Read the above assertion and reason and choose the correct option regarding it.

Assertion :An aqueous solution of sodium thiosulphate on acidification turns milky white. Reason: Colloidal sulphur is formed during acidification of an aqueous solution thiosulphate.

Read the above assertion and reason and choose the correct option regarding it.