Compare thermal stability of $Z n O, C d O$ and $H g O$ .

C d O > Z n O > H g O

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H g O > Z n O > C d O

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Z n O > C d O > H g O

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Z n O > H g O > C d O

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Solution

The correct option is C $Z n O > C d O > H g O$
The order of thermal stability is $Z n O > C d O > H g O$ as on moving down the group, the stability of oxides decreases.

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Similar questions

Given that,

$Z n + \frac{1}{2} O_{2} \to Z n O + 35.25 K J$

$H g O \to H g + \frac{1}{2} O_{2} - 9.11 K J$

The heat of the reaction $Z n + H g O \to Z n O + H g$ is

Z n + 1 / 2 O_{2} \to Z n O + 35.25 k J . H g O \to H g + 1 / 2 O_{2} + 9.11 k J .

Z n + H g O \to Z n O + H g

Z n + \frac{1}{2} O_{2} \to Z n O Δ H = + 84000 c a l

H g + \frac{1}{2} O_{2} \to H g O Δ H = + 21700 c a l

(Δ H)

Z n + H g O \to Z n O + H g

1.35

Z n (H g) + H g O_{(s)} \to Z n O_{(s)} + H g_{(l)}

H g O (s) + H_{2} (g) \to H g (ℓ) + H_{2} O (ℓ)

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