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$(1) \,LAH (LiAlH_4)$ $(2) \,OsO_4$
$(3)\, NaIO_4$ $(4)\, NaBH_4$
| $a.$ | $\ce{As_2O_3 < SiO_2 < P_2O_3 < SO_2}$ | Acid strength. |
| $b.$ | $\ce{AsH_3 < PH_3 < NH_3}$ | Enthalpy of vapourisation. |
| $c.$ | $\ce{S < O < Cl < F}$ | More negative electron gain enthalpy. |
| $d.$ | $\ce{H_2O > H_2S > H_2Se > H_2Te}$ | Thermal stability. |
${E^0}_{cell} = 0.79\;V$
$E_{C{r_2}O_7^{2 - }}^0 = 1.33\;V,\;{E^0}_{{I_2}}$ is ........... $\mathrm{V}$
$[ C ]$ is $........$