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Redox Reactions

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
Ques. 1AIPMT 2012 (Prelims)

When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

  1. zero to +1 and zero to −5
  2. zero to −1 and zero to +5
  3. zero to −1 and zero to +3
  4. zero to +1 and zero to −3

Answer

(2) zero to −1 and zero to +5

Solution

3Cl2+6NaOH(hot, conc.) 5NaCl+NaClO3+3H2O

In NaCl, Cl = −1 ; in NaClO3, 1+x+3(-2)=0 x=+5

Chlorine disproportionates: 0 → −1 and 0 → +5.

Answer: (2)

Keep practising — Redox Reactions

Ques. 2AIPMT 2012 (Prelims)

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?

  1. S
  2. H
  3. Cl
  4. C
Ques. 3AIPMT 2012 (Prelims)

In which of the following compounds, nitrogen exhibits highest oxidation state?

  1. N2H4
  2. NH3
  3. N3H
  4. NH2OH
Ques. 4AIPMT 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
Ques. 5AIPMT 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. 6AIPMT 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. 7AIPMT 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. 8AIPMT 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. 9AIPMT 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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