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An inorganic compound (A) loses its wate...

An inorganic compound (A) loses its water of crystallisation on heating and its aqueous solution gives the following reactions:
a. It gives a white turbidity with dil HCI.
b. It decolourises a solution of iodine in KI.
c. It gives a white ppt. with `AgNO_(3)` solution, which turns black on standing.

Text Solution

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(A) is sodium thiosulphate, `Na_(2)S_(2)O_(3).5H_(2)O`.
a. `Na_(2)S_(2)O_(3)+HCI rarr NaCI+H_(2)O+underset("turbidity")underset("White")(S darr)+SO_(2)`
b. `2Na_(2)S_(2)O_(3)+underset((I_(2)"in" KI))(KI_(3))rarr Na_(2)S_(4)O_(6)+KI+2NaI
c. Na_(2)S_(2)O_(3)+2AgNO_(3)rarr underset("White ppt.")(Ag_(2)S_(2)O_(3)darr)+NaNO_(3)`
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