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Identify incorrect statement or reaction from following is

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${Na}_{2} {CO}_{3} . 10 H_{2} O \to {Na}_{2} {CO}_{3} . H_{2} O + 9 H_{2} O (T < 375 K)$

IA metal peroxides are coloured and paramagnetic in nature

KO₂ is a paramagnetic and coloured due to the presence of unpaired electron

For Cs the stability of ${Cs}_{2} O < {CsO}_{2}$

answer is B.

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Peroxide anion does not have unpaired e^-

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