NEET AIPMT Chemistry Chapter Wise Solutions - Redox Reactions

NEET AIPMT Chemistry Chapter Wise Solutions – Redox Reactions

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NEET AIPMT Chemistry Chapter Wise Solutions Physics Biology

1. Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour? (NEET-II 2016)
(a) Cu + 2H₂S0₄ -> CuS0₄ + S0₂ + 2H₂0
(b) S + 2H₂S0₄ -> 3S0₂ + 2H₂0
(c) C + 2H₂S0₄ -> C0₂ + 2S0₂ + 2H₂0
(d) CaF₂ + H₂S0₄ -> CaS0₄ + 2HF

2. The pair of compounds that can exist together is (2014)
(a) FeCl₃, SnCl₂
(b) HgCl₂, SnCl₂
(c) FeCl₂, SnCl₂
(d) FeCl₃, KI

3. (I) H₂0₂ + 0₃ –>H₂0 + 20₂
(II) H₂0₂ + Ag₂0 –>2Ag + H₂0 + 0₂
Role of hydrogen peroxide in the above reactions is respectively (2014)
(a) oxidizing in (I) and reducing in (II)
(b) reducing in (I) and oxidizing in (II)
(c) reducing in (I) and (II)
(d) oxidizing in (I) and (II)

4. In acidic medium, H₂0₂ changes Cr₂0₇2- to Cr0₅ which has two (—O—O—) bonds. Oxidation state of Cr in Cr0₅ is (2014)
(a) +5
(b) +3
(c) +6
(d) -10

5. When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from (2012)
(a) zero to +1 and zero to -5
(b) zero to -1 and zero to +5
(c) zero to -1 and zero to +3
(d) zero to +1 and zero to -3

6. A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number? (2012)
(a) S
(b) H
(c) a
(d) C

7. Oxidation numbers of P in P0₄3-, of S in S0₄2- and that of Cr in Cr₂0₇2- are respectively (2009)
(a) +3, +6 and +5
(b) +5, +3 and +6
(c) -3, +6 and +6
(d) +5, +6 and +6

8. Number of moles of Mn0_4- required to oxidize one mole of ferrous oxalate completely in acidic medium will be (2008)
(a) 7.5 moles
(b) 0.2 moles
(c) 0.6 moles
(d) 0.4 moles.

9. Which is the best description of the behaviour of bromine in the reaction given below? H₂0 – Br₂–> HOBr + HBr (2004)
(a) Proton acceptor only
(b) Both oxidised and reduced
(c) Oxidised only
(d) Reduced only

10. The oxidation states of sulphur in the anions SO₃2-,S_{2 O4}2-and and S₂0₆2- follow the order (2003)
(a) S_{2 O4}2-< SO₃2- < S₂0₆2-
(b) SO₃2- <S_{2 O4}2- < S₂0₆2-
(c) S_{2 O4}2– <S₂0₆2- < SO₃2-
(d)S₂0₆2-< S_{2 O4}2- < SO₃2-

11. Oxidation state of Fe in Fe₃0₄ is (1999)
(a) 5/4
(b) 4/5
(c) 3/2
(d)8/3

12. Which of the following is redox reaction? (1997)
(a) Evaporation of H₂0
(b) Both oxidation and reduction
(c) H₂S0₄ with NaOH
(d) In atmosphere 0₃ from 0₂ by lighting.

13. The oxide, which cannot act as a reducing agent is (1995)
(a) C0₂
(b) Cl02
(c) N02
(d) S02

14. Which substance is serving as a reducing agent in the following reaction?
14H⁺ + Cr207^2- + 3Ni –> 7H20 + 2Cr³⁺ + 3Ni²⁺ (1994)
(a) H⁺
(b) Cr207^2-
(c) H20
(d) Ni