KCET2026ChemistryRedox Reactions
Given below are two statements. Statement-I: In H ₂ O ₂ , each oxygen atom is assigned an oxidation number of -1 , in RbO ₂ each oxygen atom is assigned an oxidation number of - 1 2 . Statement-II: Representation of HAuCl ₄ and MnO ₂ in stock notation is HAu(III)Cl ₄ and Mn(II)O ₂ , respectively. Examine the above statements and choose the correct answer.
Options
- ABoth Statement I and Statement II are correct
- BBoth Statement I and Statement II are incorrect
- CStatement I is correct but Statement II is incorrect
- DStatement I is incorrect but Statement II is correct
Correct answer
C. Statement I is correct but Statement II is incorrect
Step-by-step solution
In H ₂ O ₂ , the oxidation state of hydrogen is +1 . Let the oxidation state of oxygen be x . 2(+1) + 2x = 0 x = -1 In RbO ₂ , rubidium is an alkali metal with an oxidation state of +1 . Let the oxidation state of oxygen be y . +1 + 2y = 0 y = - 1 2 Thus, Statement-I is correct. In HAuCl ₄ , the oxidation state of Au is +3 . Its Stock notation is HAu(III)Cl ₄ . In MnO ₂ , the oxidation state of Mn is +4 . Its Stock notation is Mn(IV)O ₂ , not Mn(II)O ₂ . Thus, Statement-II is incorrect. Answer: Statement I is corre