Question
The fundamental basis of the present-day Periodic Table is that elements are
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$(a)$ Peroxide ion as well as dioxygen molecule both are paramagnetic species
$(b)$ In set of isomers, $[Cr(H_2O)_6]Cl_3$ and $[CrCl(H_2O) _5]Cl_2 . H_2O,$ both compounds can easily loose water molecule on treatment with cone. $H_2SO_4$
$(c)$ During transformation $NO \to NO^+$ , bond length and magnetic behaviour decreases
$(d)$ An ether is more volatile than alcohol both having same molecular formula
$C{H_3} - C{H_2} - Br\,\xrightarrow{{KCN}}\,\xrightarrow[{{H_2}O}]{{\bar OH}}\,\xrightarrow[\Delta ]{{PC{l_5}}}$ product