Question

SUPER DARE 2020.........


ANSWER ALL QUESTION TO GET A BRAINLIEST ANSWER, 30 FOLLOWERS IN YOUR ACCOUNT AND A THANKS AND A 5.0 RATE AND 50 POINTS..........​

Answer 1

1. The number of electrons involved in the reaction of Cr₂O₇^{2-} in acidic solution to Cr{+3} is

Cr₂O₇^{2-} + 3e^- → Cr{+3}

c) 3

2. When KMnO4 acts as an oxidising agent and ultimately forms [MnO4]^{-2}, MnO2, Mn2O3, Mn{2+} then the number of electrons transferred in each case respectively is

Mn2O3 ← KMnO4 → [MnO4]^{-1}

c) 1, 3, 4, 5

3. 2MnO4^{-} + 5H2O2 + 6H^{+} -> 2z + 5O2 + 8H2O in this reaction z is

5H2O2+2MnO4- +6H+ -> 2Mn2+ +8H20 + 5O2

a) Mn{2+}

4. What is "A" in the following reaction 2 Fe ^{3+} + Sn^{2+} -> 2Fe^{2+} + A

2 Fe ^{3+} + Sn^{2+} -> 2Fe^{2+} + Sn^{4+}

b) Sn^{4+}

5. MnO^{4-} + C2O4^{-2} + H^{+} -> Mn^{2+} + CO2 +H2O the correct coefficients of the reaction for the balanced reaction is

2MnO4- + 5C2O42- + 16H+ → 2Mn2+ + 10CO2 + 8H2O

a) 2, 5, 16

6. Which of the following is a redox reaction

Zn + 2AgCN   → 2Ag  + Zn(CN)2

0       +1+2-3           0          +2+2-3

There is a change in the oxidation status of the constituents.

d) Zn + 2AgCN  -> 2Ag  + Zn(CN)2

7. In the balanced chemical reaction IO3^- + aI^- + bH^+ -> cH2O + dI2 a, b, c and d respectively

IO3^- + 5I^- + 6H^+ -> 3H2O + 3I2

a) 5, 6, 3, 3

8. In the conversion KMnO4 -> K2MnO4 the oxidation number of the following changes

KMnO4 -> (+1) + (+7) + (-2)4

K2MnO4 -> (+1)2 + (+6) + (-2)4

The oxidation number of Mn changes from +7 to +6.

b) Mn

9. In the reaction MnO2 + 4HCl -> MnCl2 + Cl2 + 2 H2O2.MnO2 acts as

Cl (chlorine) is the substance which is oxidized from the HCl, and it is the reducing agent for the MnO2 as well.

c) Both

10. PbS + H2O2 -> PbSO4 + 4H2O in this reaction PbS undergoes

Sulfide ion is oxidized to sulfate ion.

a) Oxidation

Answer 2

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1. the number of electrons involved in the reduction of Cr2O7-2 in acidic solution to Cr3 is 3(C)
2. Option C
3. Option A
4. Option B
5. Option A
6. Option D
7. Option A
8. Option B
9. Option C
10. Option A

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