JEE Main · 2023 · 29 Jan 2023 · Shift 2 · d and f Block Elements

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The set of correct statements is:
(i) Manganese exhibits +7 oxidation state in its oxide.
(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.
(iii) Sc shows +4 oxidation state which is oxidizing in nature.
(iv) Cr shows oxidising nature in +6 oxidation state.

(A)(ii) and (iii)
(B)(i), (ii) and (iv)✓ Correct
(C)(i) and (iii)
(D)(ii), (iii) and (iv)

Answer: (B)

Solution

Manganese reaches its group oxidation state of

+ 7

in its heptoxide

Mn X_{2} O X_{7}

, so the first statement holds. Ruthenium and osmium attain the

+ 8

state in the tetroxides

RuO X_{4}

and

OsO X_{4}

, so the second statement holds. Scandium has only the

+ 3

state available to it and shows no

+ 4

oxidation state, so the third statement fails. Chromium in its

+ 6

state, as in the dichromate ion, is a strong oxidising agent, so the fourth statement holds. The correct statements are the first, the second and the fourth.

JEE Main · 2023 · 29 Jan 2023 · Shift 2 · Single correct option

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JEE Main · 2023 · 29 Jan 2023 · Shift 2 · d and f Block Elements

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