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Identify the correct statements from the following.
i)Oxygen shows – 2, -1 ,+1, and +2 oxidation states.
ii)The thermal stability of $H_{2} O, H_{2} S e$ and $H_{2} S$ follows the order $H_{2} O < H_{2} S < H_{2} S e$
iii)The reducing nature of $H_{2} S e, H_{2} S$ and $H_{2} T e$ follows the order $H_{2} S < H_{2} S e < H_{2} T e$

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ii, iii

i, ii

i,iii

i, ii, iii

answer is C.

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Detailed Solution

Correct order is $H_{2} S e < H_{2} S < H_{2} O$ . In the respective trend, hydrogen bonding exists in water that enhances the thermal stability. As the atomic size increases, thermal stability of group 16 hydrides decreases.

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