MCQ
Following is a confirmatory test for aromatic primary amines. Identify reagent (A) and (B)


- A$A = HNO _3 / H _2 SO _4$

- B$A = NaNO _2+ HCl , 0-5^{\circ} C$

- C$A = NaNO _2+ HCl , 0-5^{\circ} C$

- ✓$A = NaNO _2+ HCl , 0-5^{\circ} C$








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Statement $(I)$ : Oxygen being the first member of group $16$ exhibits only $-2$ oxidation state.
Statement $(II)$ : Down the group $16$ stability of $+4$ oxidation state decreases and $+6$ oxidation state increases.
In the light of the above statements, choose the most appropriate answer from the options given below:
$(I)\,\,La(OH)_3$ is the least basic among hydroxides of lanthanides.
$(II) \,\,Zr^{4+}$ and $Hf^{4+}$ posses almost the same ionic radii.
$(III)\,\,Ce^{4+}$ can as an oxidizing agent
Which of the above is/are true ?
(At. nos. $Ce = 58, Sm = 62,$$ Eu = 63, Yb = 70$)