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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Consider the following reaction,

xMnO subscript 4 superscript minus space plus space yC subscript 2 straight O subscript 4 superscript 2 minus end superscript space plus space zH to the power of plus space rightwards arrow xMn to the power of 2 plus end exponent space plus space 2 yCO subscript 2 space plus space straight z over 2 straight H subscript 2 straight O
The values of x,y and z in the reaction are respectively

  • 5,2 and 16

  • 2,5 and 8

  • 2,5 and 16

  • 2,5 and 16

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2.

Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4?

  • 2HI+ H2SO4 →I2 +SO2+2HO

  • Ca(OH)2 +H2SO4 → CaSO4 +2H2O

  • NaCl +H2SO4 → NaHSO4 + HCl

  • NaCl +H2SO4 → NaHSO4 + HCl

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3.

Hydrogen peroxide oxidises Fe(CN)6]4- to [Fe(CN)6]3- in acidic medium but reduces [Fe(CN)6]3- to [Fe(CN)6]4- in alkaline medium. The other products formed are, respectively

  • H2O and (H2O + OH-)

  • (H2O + O2) and H2O

  • (H2O + O2) and (H2O + OH-)

  • H2O and (H2O + O2)


4.

How many faradays are required to reduce 1 mol of Cr2O72- to Cr3+ in acid medium?

  • 2

  • 3

  • 5

  • 6


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5.

Nitric acid can be obtained from ammonia via the formations of the intermediate compounds

  • nitric oxide and nitrogen dioxide

  • nitrogen and nitric oxide

  • nitric oxide and dinitrogen pentoxide

  • nitrogen and nitrous oxide


6.

In the reaction

K2Cr2O7  K2CrO4 + O2 + (X), (X) is

  • CrO3

  • C2O7

  • Cr2O3

  • CrO4


7.

What are the species (A) and (B) in the following

CrO3 + H2O → (A) OH- (B)

  • H2CrO4, H2Cr2O7

  • H2Cr2O7, Cr2O3

  • CrO42-, Cr2O72-

  • H2CrO4, CrO42-


8.

In the reaction,

2FeCl3 + H2S → 2FeCl2 + 2HCl + S

The correct statement is

  • FeCl3 acts as an oxidising agent

  • H2S and FeCl3 both act as an oxidising agent

  • FeCl3 get oxidised while H2S get reduced

  • H2S acts as an oxidising agent


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9.

When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxide are liberated in equal volumes according to the equation,

xCu + yHNO3 → Cu(NO3)2 + NO + NO2 + H2O

The coefficients of x and y are respectively

  • 2 and 3

  • 2 and 6

  • 1 and 3

  • 3 and 8


10.

The standard reduction potentials at 298 K for the following half reactions are given against each:

Zn+(aq) +2e- Zn(s)     E° = - 0.762 VCr3+ (aq) + 3e-  Cr(s)   E° = - 0.7420V2H+(aq) + 2e-  H2(g)   E° = 0.00VFe3+(aq) + 3e-  Fe2+    E° =+ 0.762 V

The strongest reducing agents is:

  • Zn(s)

  • Cr(s)

  • H2 (g)

  • Fe2+ (aq)


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