Most stable and least stable oxides are:

P_{4} O_{10}, C l_{2} O_{7}

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N a_{2} O, C l_{2} O_{7}

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M g O, C l_{2} O_{7}

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C l_{2} O_{7}, M g O

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Solution

The correct option is A $P_{4} O_{10}, C l_{2} O_{7}$
From data, it can be seen that $P_{4} O_{10}$ has the maximum negative heat of formation ( $2984$ kJ/mole), so it is most stable.
And $C l_{2} O_{7}$ have a positive value of heat of formation, so it is least stable.

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