Oxidation and Reduction

31.	The oxidation state of Mn in KMnO4 is –
	A. +2
	B. -2
	C. +7
	D. -7 Option”C” is correct

32.	Which of the following is the correct oxidation number of iron (Fe) in the hexa cyanoferrate ion [Fe(CN)₆]⁴ ?
	A. +2
	B. +3
	C. +4
	D. -2 Option”A” is correct

33.	In which of the following chemicals, which one element has an oxidation state in all its compounds?
	A. Carbon
	B. florin
	C. hydrogen
	D. oxygen Option”B” is correct

34.	In the reaction of potassium permanganate with ferrous ammonium sulphate in acidic medium, the change in oxidation state of manganese in potassium permanganate is –
	A. +5 to +2
	B. +6 to +2
	C. +7 to +2
	D. +7 to +3 Option”C” is correct

35.	The oxidation number of nickel in K₄ [Ni(CN)₄] is –
	A. Zero
	B. +4
	C. -4
	D. +8 Option”A” is correct

36.	The oxidation state of oxygen in OF₂ is +1.
	A. CL₂O
	B. HCI
	C. ICI
	D. HCIO₄ Option”A” is correct

37.	The oxidation number of carbon in oxalic acid (H₂C₂O₄) is –
	A. +4
	B. +2
	C. +3
	D. +1 Option”C” is correct

38.	In which of the following the oxidation number of chlorine is +1
	A. chlorine oxide
	B. hydrochloric acid
	C. iodine chloride
	D. potassium chloride Option”A” is correct

39.	Which of the following is the compound having +2 oxidation state of oxygen?
	A. F₂O
	B. MnO₂
	C. H₂O₂
	D. CO₂ Option”A” is correct

40.	The oxidation state of sulfur in Na₂S₂O₃ is –
	A. +2
	B. -2
	C. +3
	D. +4 Option”A” is correct

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