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Sodium Thiosulphate

When strongly...

Question

When strongly heated, Sodium thiosulphate disproportionates into compounds having _____ different oxidation states.

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Solution

In the following disproportionation reaction all are solids!

$5 N a_{2} S_{2} O_{3} Δ - \to 3 N a_{2} S_{2} O_{3} + N a_{2} S + 4 S$

Earlier, Hypo was extensively used in photography because it could form a complex with undecomposed Silver halide on the photographic plate.

$A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$

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When strongly heated, Sodium thiosulphate disproportionates into compounds having ___ different oxidation states.

Q. Sodium thiosulphate on strong heating gives a compound of the form

A_{a} B_{b}

then the value of b-a is :

X

is treated with sodium hydroxide, a white ppt. of

A

is obtained which is soluble in excess of

N a O H

to form soluble complex

B

A

is soluble in dilute

H C l

to form compound

C

A

when strongly heated gives compound

D

which is used to extract metals.

X

Q. In a mildly alkaline medium, thiosulphate ion is oxidized by

K M n O_{4}

to "A". The oxidation state of sulphur in "A" is:

Q. Aqueous solution of sodium thiosulphate turns milky white on acidification showing a disproportionation reaction.
If true enter 1, else enter 0.

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