The reaction of aqueous KMnO4 with H2O2 in acidic conditions giv

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

1.0 g of magnesium is burnt with 0.56 g of O2 in a closed vessel. Which reactant is left in excess and how much?

  • Mg, 0.16 g

  • O2, 0.16 g

  • Mg, 0.44 g

  • Mg, 0.44 g

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12.

The pair of compounds that can exist together is 

  • FeCl3.SnCl2

  • HgCl2,SnCl2

  • FeCl2,SnCl2

  • FeCl2,SnCl2

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13.

Be2+ is isoelectronic with which of the following ions?

  • H+

  • Li+

  • Na+

  • Na+

2186 Views

14.

Which of the following molecules has the maximum dipole moment?

  • CO2

  • CH4

  • NH3

  • NH3

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15.

Which one of the following species has the plane triangular shape?

  • N3

  • NO3-

  • NO2-

  • NO2-

1207 Views

16.

Magnetic moment 2.83 BM is given by which of the following ions?

(At. no.: Ti =22; Cr=24; Mn=25; Ni=28)

  • Ti3+

  • Ni2+

  • Cr3+

  • Cr3+

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17.

In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralised 10 mL of 1 M H2SO4.The percentage of nitrogen in the soil is

  • 37.33

  • 45.33

  • 35.33

  • 35.33

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18.

Which of the following organic compounds has same hybridization as its combustion product -(CO)2?

  • Ethane

  • Ethyne

  • Ethene

  • Ethene

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19.

(I)H2O2 +O3 --> H2O +2O2
(II) H2O2 +Ag2O +--> 2Ag +H2O +O2
Role of hydrogen peroxide in the above reaction is respectively

  • oxidising in (I) and reducing (II)

  • reducing (I) and oxidizing in (II)

  • reducing in (I) and (II)

  • reducing in (I) and (II)

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20.

The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives.

  • Mn4+ and O2

  • Mn2+ and O2

  • Mn2+ and O3

  • Mn2+ and O3


B.

Mn2+ and O2

The reaction of aqueous KMnO4 with H2O2 in acidic medium is 
3H2SO4 + KMnO4 +5 H2O2 --> 5O2 +2MnSO4 +8H2O +K2SO4

In the reaction, KMnO4 oxidise H2O2 to O2 and itself [MnO4-] gets reduced to Mn2+ ions as MnSO4. Hence, aqueous solution of KMnO4 with H2O2 yields Mn2+ and O2 in acidic conditions.

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