${A g N O}_{3} Δ - \to (W) + (X) + O_{2}$
$(X) + H_{2} O ⟶ H {N O}_{2} + H {N O}_{3}$
$(W) + H {N O}_{3} ⟶ Y + N O + H_{2} O$
$(Y) + {N a}_{2} S_{2} O_{3} (excess) ⟶ Z + N a {N O}_{3}$
Identify $(W)$ to $(Z)$ :

W = A g, X = N_{2} O, Y = A g {N O}_{3}, Z = {N a}_{2} [A g {(S_{2} O_{3})}_{2}]

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W = {A g}_{2} O, X = N O, Y = A g {N O}_{3}, Z = {N a}_{3} [A g {(S_{2} O_{3})}_{2}]

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W = A g, X = N O_{2}, Y = A g {N O}_{3}, Z = {N a}_{3} [A g {(S_{2} O_{3})}_{2}]

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W = {A g}_{2} O, X = N_{2}, Y = A g {N O}_{3}, Z = N a [A g {(S_{2} O_{3})}_{2}]

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Solution

The correct option is C $W = A g, X = N O_{2}, Y = A g {N O}_{3}, Z = {N a}_{3} [A g {(S_{2} O_{3})}_{2}]$
On heating, silver nitrate decomposes to silver, nitrogen dioxide and oxygen.
$2 A g N O_{3} heat - - \to 2 A g W + 2 N O_{2} X + O_{2}$
Nitrogen dioxide reacts with water to form mixture of nitrous acid and nitric acid.
$2 N O_{2} X + H_{2} O \to H N O_{2} + H N O_{3}$
Silver reacts with nitric acid to form silver nitrate, nitric oxide and water.
$3 A g W + 4 H N O_{3} \to 3 A g N O_{3} Y + N O + 2 H_{2} O$
Silver nitrate reacts with excess hypo solution to form sodium argento thiosulphate.
$2 A g N O_{3} Y + 4 N a_{2} S_{2} O_{3} excess \to 2 N a_{3} [A g (S_{2} O_{3})_{2}] Z + 2 N a N O_{3}$

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Similar questions

H g {(N O_{3})}_{2} Δ - \to W + X + O_{2}

X + H_{2} O ⟶ H N O_{2} + H N O_{3}

W + H N O_{3} ⟶ Y + N O + H_{2} O

Y + N a_{2} S_{2} O_{3} (e x c e s s) ⟶ Z + N a N O_{3}

W

X

Y

Z

{A g N O}_{3}

{N a}_{2} S_{2} O_{3}

{N a}_{3} [{A g (S_{2} O_{3})}_{2}]

A g

{N a}_{3} [A g {(S_{2} O_{3})}_{2}]

A g B r

{N a}_{3} [{A g (S_{2} O_{3})}_{2}]

C a C O_{3} △ \to W + X

W + H_{2} O \to Y

Y + Z \to N a O H + C a C O_{3}

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