On heating a mixture of common salt and $K_2Cr_2O_7$ in equal amount along with concentrated $H_2SO_4$ in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:
A. Mn forms the oxide $\mathrm{Mn_2O_7}$, in which Mn is in its highest oxidation state.
B. Oxygen stabilizes the Mn in higher oxidation states by forming multiple bonds with Mn.
C. $\mathrm{Mn_2O_7}$ is an ionic oxide.
D. The structure of $\mathrm{Mn_2O_7}$ consists of one bridged oxygen.
Choose the correct answer from the options given below :
$\mathrm{MnO}_4{ }^{2-}$, in acidic medium, disproportionates to :
The correct decreasing order of spin only magnetic moment values (BM) of Cu+, Cu2+, Cr2+ and Cr3+ ions is :
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