How does ozone react with the following?
(i) $C_{2} H_{4}$
(ii) Moist $I^{-}$
(iii) $H g$
(iv) $A g$

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Solution

(i) Ethylene reacts with ozone to form ozonide which is decomposed by zinc dust and water to form formaldehdye.
$C H_{2} = C H_{2} + O_{3} \to 2 C H_{2} O + H_{2} O_{2}$
(ii) Moist iodide ion is oxidized to iodine.
$2 K I + H_{2} O + O_{3} \to 2 K O H + I_{2} + O_{2}$
(iii) Mercury reacts with ozone to form an oxide. Meniscus of mercury is lost and mercurous oxide sticks to the glass. It is known as tailing of mercury.
On shaking with water, the meniscus is restored.
$2 H g + O_{3} \to H g_{2} O + O_{2}$
(iv) Ag reacts with ozone to form silver oxide.
$2 A g + O_{3} \to A g_{2} O + O_{2}$
Silver oxide may be reduced back to Ag by ozone.
$A g_{2} O + O_{3} \to 2 A g + 2 O_{2}$

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Question 6
What happens when calcium is treated with water?

(i) It does not react with water.
(ii) It reacts violently with water.
(iii) It reacts less violently with water.
(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

a) (i) and (iv) (b) (ii) and (iii)

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How does ozone react with the following?(i) C2H4(ii) Moist I−(iii) Hg(iv) Ag

How does ozone react with the following?
(i) $C_{2} H_{4}$
(ii) Moist $I^{-}$
(iii) $H g$
(iv) $A g$