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Q.

Properties common to the elements manganese, iron, cobalt, nickel and copper include the ready formation by them all of :
(I) coloured ions in aqueous solution
(II) oxides of nitrogen are formed on reaction with concentrated HNO₃
(III) chlorides of formula MCl₂ and MCl₃

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a

I, II, III

b

I, II

c

II, III

d

I only

answer is B.

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Detailed Solution

${Mn}^{3 +} (aq) ⟶ violet colour$
${Mn}^{2 +} (aq) ⟶ Pink colour$
${Fe}^{2 +} (aq) ⟶ green colour$
${Fe}^{3 +} (aq) ⟶ yellow colour.$
${Co}^{3 +} (aq) / {Co}^{2 +} (aq) ⟶ blue-pink colour.$
${Ni}^{2 +} (aq) ⟶ green colour.$
${Cu}^{2 +} (aq) ⟶ blue colour$
${Cu}^{3 +} does not exist, {Ni}^{3 +} does not exist.$

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