MCQ
Among the following the weakest base is
- A${C_6}{H_5}C{H_2}N{H_2}$
- ✓${C_6}{H_5}C{H_2}NHC{H_3}$
- C${O_2}N\,C{H_2}N{H_2}$
- D$C{H_3}NH\,CHO$
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$(A)$ Dinitrogen is a diatomic gas which acts like an inert gas at room temperature.
$(B)$ The common oxidation states of these elements are $-3,+3$ and +5 .
$(C)$ Nitrogen has unique ability to form $\mathrm{p} \pi-\mathrm{p} \pi$ multiple bonds.
$(D)$ The stability of +$5$ oxidation states increases down the group.
$(E)$ Nitrogen shows a maximum covalency of $6$.
Choose the correct answer from the options given below.
$E_{cell} = $ ?

$(I)$ Mond's process for purification of nickel
$(II)$ Removal of unreacted $AgBr$ from photographic plate
$(III)$ Removal of lead poisoning from the body
$I$ $-$ $II$ $-$ $III$