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Redox Reactions

AIPMT 2009MCQEasy📈 Topic in 25% papers+4−1
Ques. 1AIPMT 2009

Oxidation numbers of P in PO43-, of S in SO42- and that of Cr in Cr2O72- are respectively

  1. +3, +6 and +5
  2. +5, +3 and +6
  3. –3, +6 and +6
  4. +5, +6 and +6

Answer

(4) +5, +6 and +6

Solution

Take O = –2 and equate the sum to the charge of the ion.

PO43-: x + 4(-2) = -3 x = +5

SO42-: x + 4(-2) = -2 x = +6

Cr2O72-: 2x + 7(-2) = -2 x = +6

Answer: (4)

Keep practising — Redox Reactions

Ques. 2AIPMT 2008

Number of moles of MnO4- required to oxidize one mole of ferrous oxalate completely in acidic medium will be

  1. 7.5 moles
  2. 0.2 moles
  3. 0.6 moles
  4. 0.4 moles
Ques. 3AIPMT 2004

Which is the best description of the behaviour of bromine in the reaction given below? H2O + Br2 HOBr + HBr

  1. Proton acceptor only
  2. Both oxidised and reduced
  3. Oxidised only
  4. Reduced only
Ques. 4AIPMT 2003

The oxidation states of sulphur in the anions SO32-, S2O42- and S2O62- follow the order

  1. S2O42- < SO32- < S2O62-
  2. SO32- < S2O42- < S2O62-
  3. S2O42- < S2O62- < SO32-
  4. S2O62- < S2O42- < SO32-
Ques. 5AIPMT 2002

Which reaction is not feasible?

  1. 2KI + Br2 2KBr + I2
  2. 2KBr + I2 2KI + Br2
  3. 2KBr + Cl2 2KCl + Br2
  4. 2H2O + 2F2 4HF + O2
Ques. 6AIPMT 2000

Oxidation numbers of A, B, C are +2, +5 and -2 respectively. Possible formula of compound is

  1. A2(BC2)2
  2. A3(BC4)2
  3. A2(BC3)2
  4. A3(B2C)2

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