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Redox Reactions

NEET (UG) 2021MCQEasy📈 Topic in 25% papers+4−1
Ques. 1NEET (UG) 2021

Which of the following reactions is the metal displacement reaction? Choose the right option.

  1. 2Pb(NO3)2 2PbO + 4NO2 + O2
  2. 2KClO3 2KCl + 3O2
  3. Cr2O3 + 2Al Al2O3 + 2Cr
  4. Fe + 2HCl FeCl2 + H2

Answer

(3) Cr2O3 + 2Al Al2O3 + 2Cr

Solution

(1) and (2) are decomposition reactions, while (4) is a hydrogen displacement reaction (Fe displaces hydrogen from the acid).

In (3), Al, a more reactive metal, displaces Cr from its oxide (thermite / aluminothermic reaction).

∴ As per NCERT, Cr2O3 + 2Al Al2O3 + 2Cr is a metal displacement reaction.

Answer: (3)

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Ques. 2NEET (UG) 2020

What is the change in oxidation number of carbon in the following reaction? CH4(g) + 4Cl2(g) CCl4(l) + 4HCl(g)

  1. 0 to +4
  2. -4 to +4
  3. 0 to -4
  4. +4 to +4
Ques. 3NEET (UG) 2019

Which of the following reactions are disproportionation reaction? Select the correct option from the following :

  1. A, C and D
  2. A and B only
  3. A and D only
  4. A, B and C
Ques. 4NEET 2018

Consider the change in oxidation state of bromine corresponding to different emf values as shown in the given diagram : BrO4- 1.82 V BrO3- 1.5 V HBrO 1.595 V Br2 1.0652 V Br- Then the species undergoing disproportionation is :

  1. BrO4-
  2. BrO3-
  3. Br2
  4. HBrO
Ques. 5NEET 2018

The correct order of N-compounds in its decreasing order of oxidation states is

  1. HNO3, NO, N2, NH4Cl
  2. HNO3, NO, NH4Cl, N2
  3. HNO3, NH4Cl, NO, N2
  4. NH4Cl, N2, NO, HNO3
Ques. 6NEET 2018

For the redox reaction, MnO4- + C2O42- + H+ Mn2+ + CO2 + H2O The correct coefficients of the reactants for the balanced equation are

  1. array|c|c|c| MnO4- & C2O42- & H+ \ 16 & 5 & 2 \ array
  2. array|c|c|c| MnO4- & C2O42- & H+ \ 2 & 5 & 16 \ array
  3. array|c|c|c| MnO4- & C2O42- & H+ \ 2 & 16 & 5 \ array
  4. array|c|c|c| MnO4- & C2O42- & H+ \ 5 & 16 & 2 \ array
Ques. 7AIPMT 2015

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?

  1. FeSO3
  2. FeC2O4
  3. Fe(NO2)2
  4. FeSO4
Ques. 8AIPMT 2015 (Cancelled)

Which of the following processes does not involve oxidation of iron?

  1. Formation of Fe(CO)5 from Fe.
  2. Liberation of H2 from steam by iron at high temperature.
  3. Rusting of iron sheets.
  4. Decolourisation of blue CuSO4 solution by iron.
Ques. 9AIPMT 2014

The pair of compounds that can exist together is

  1. FeCl3, SnCl2
  2. HgCl2, SnCl2
  3. FeCl2, SnCl2
  4. FeCl3, KI
Ques. 10AIPMT 2014

In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two (-O-O-) bonds. Oxidation state of Cr in CrO5 is

  1. +5
  2. +3
  3. +6
  4. -10
Ques. 11AIPMT 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

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