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(D) $FALSE$: Peroxide ion $(O_2^{2-})$ is diamagnetic,while dioxygen $(O_2)$ is paramagnetic.$(b)$ $FALSE$: Conc. $H_2SO_4$ acts as a dehydrating agen

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$FFTT$

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(D) $FALSE$: Peroxide ion $(O_2^{2-})$ is diamagnetic,while dioxygen $(O_2)$ is paramagnetic.$(b)$ $FALSE$: Conc. $H_2SO_4$ acts as a dehydrating agent and removes water of crystallization from $[CrCl(H_2O)_5]Cl_2 \cdot H_2O$,but it cannot remove water molecules coordinated as ligands in $[Cr(H_2O)_6]Cl_3$.$(c)$ $TRUE$: In $NO$ ($15$ electrons),the bond order is $2.5$ and it is paramagnetic. In $NO^+$ ($14$ electrons),the bond order is $3.0$ (bond length decreases) and it is diamagnetic.$(d)$ $TRUE$: Ethers do not form intermolecular hydrogen bonds,whereas alcohols do. Therefore,ethers are more volatile than isomeric alcohols.

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