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JEE Main202329 Jan 2023Evening ShiftChemistryd and f Block ElementsActual

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.

Options

  1. A(ii) and (iii)
  2. B(i), (ii) and (iv)
  3. C(i) and (iii)
  4. D(ii), (iii) and (iv)

Correct answer

B. (i), (ii) and (iv)

Step-by-step solution

(i) The oxidation state of Mn in oxide ( Mn 2 O 7 ) is: Let us consider Mn as x . ⇒   2 x   +   7 ( - 2 )   =   0 ⇒   2 x   +   ( - 14 )   =   0 ⇒   2 x   - 14   =   0 ⇒   2 x   =   14 ⇒ x   =   7 (ii) The oxidation state of Ruthenium in oxide ( RuO 4 ) is: Consider Ru as x . ⇒   x   +   4 ( - 2 )   =   0 ⇒   x   -   8   = 0 ⇒ &#1

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