Which is incorrect statement? (a) The heats of hydration of the dip...

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Which is incorrect statement?
(a) The heats of hydration of the dipositive alkaline earth metal ions decrease with an increase in their ionic size
(b) \( \mathrm{NaNO}_{3} \) forms \( \mathrm{Na}_{2} \mathrm{O}_{2} \) on heating
\( \mathrm{P} \)
(c) Hydration of alkali metal ion is less than that of IIA group
W
(d) Alkaline earth metal ions, because of their much larger charge to size ratio, exert a much stronger electrostatic attraction on the oxygen of water molecule surrounding them
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