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Redox Reactions · Question 25

AIPMT 2000MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(2) A3(BC4)2

Solution

For a neutral compound, the sum of oxidation numbers = 0.

(1) A2(BC2)2: 2(+2) + 2[(+5) + 2(-2)] = 4 + 2 = +6 ✗

(2) A3(BC4)2: 3(+2) + 2[(+5) + 4(-2)] = 6 - 6 = 0 ✓

(3) A2(BC3)2: 2(+2) + 2[(+5) + 3(-2)] = 4 - 2 = +2 ✗

(4) A3(B2C)2: 3(+2) + 2[2(+5) + (-2)] = 6 + 16 = +22 ✗

∴ The possible formula is A3(BC4)2 (like Ca3(PO4)2).

Answer: (2)

AIPMT 2000

Keep practising — Redox Reactions

2

In an acidic medium, 10 mL of 0.25 M oxalic acid is titrated with KMnO4 solution. If the volume of KMnO4 solution required to reach end point is 10 mL, the strength of the KMnO4 solution is

  1. 0.15 M
  2. 0.10 M
  3. 0.20 M
  4. 0.25 M
RE-NEET (UG) 2026
3

The correct decreasing order of oxidation state of the underlined atom in each molecule is

  1. P4O6 > Cl2O7 > AlH3
  2. P4O10 > SO3 > H2 O
  3. N2O5 > Al2O3 > H2 S
  4. PbO2 > N2O3 > SO3
RE-NEET (UG) 2026
4

Consider the following compounds : KO2, H2 O2 and H2 SO4 The oxidation state of the underlined elements in them are, respectively,

  1. +1, -2, and +4
  2. +4, -4, and +6
  3. +1, -1, and +6
  4. +2, -2, and +6
NEET (UG) 2025
5

Which reaction is NOT a redox reaction?

  1. Zn + CuSO4 ZnSO4 + Cu
  2. 2KClO3 + I2 2KIO3 + Cl2
  3. H2 + Cl2 2HCl
  4. BaCl2 + Na2SO4 BaSO4 + 2NaCl
NEET (UG) 2024
6

On balancing the given redox reaction, a Cr2O72-(aq) + b SO32-(aq) + cH+(aq) 2a Cr3+(aq) + b SO42-(aq) + c2H2O( ) the coefficients a, b and c are found to be, respectively -

  1. 3, 8, 1
  2. 1, 8, 3
  3. 8, 1, 3
  4. 1, 3, 8
NEET (UG) 2023
7

Which of the following reactions is a decomposition redox reaction?

  1. P4(s) + 3OH-(aq) + 3H2O(l) PH3(g) + 3H2PO2-(aq)
  2. 2Pb(NO3)2(s) 2PbO(s) + 4NO2(g) + O2(g)
  3. N2(g) + O2(g) 2NO(g)
  4. Cl2(g) + 2OH-(aq) ClO-(aq) + Cl-(aq) + H2O(l)
NEET (UG) 2022 (Phase 2)
8

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
NEET (UG) 2021
9

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
NEET (UG) 2020
10

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
NEET (UG) 2019
11

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
NEET 2018

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