Which are not blackend by atmospheric $H_{2} S$ ?

T i O_{2}

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Z n O

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Z n S O_{4} + B a S

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All of these

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Solution

The correct option is D All of these
Both zinc oxide and zinc sulphate react with hydrogen sulphide in the presence of ammonium hydroxide to form zinc sulphide which is white in colour however on exposure to light turns yellow.

$Z n^{2 +} H_{2} S N H_{4} O H - ---- \to Z n S \to + H_{2} S O_{4}$

Similarly, titanium dioxide does not form a black precipitate with hydrogen sulphide.

So, the correct option is $D$

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Similar questions

Z n O

T i O_{2}

V_{2} O_{5}

H_{2} S

Z n S O_{4} .7 H_{2} O A b o v e 39^{\circ} C - ------ \to B e l o w 70^{\circ} C A A b o v e 70^{\circ} C - ------ \to B A b o v e 280^{\circ} C - ------ \to O_{2} + S O_{2} + Z n O

Z n O + H_{2} S O_{4} \to Z n S O_{4} + H_{2} O

{Z n O}_{(s)} + {H_{2} S O_{4}}_{(a q)} \to {Z n S O_{4}}_{(s)} + {H_{2} O}_{(a q)}

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