Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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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


A.

Mg, 0.16 g

The balanced chemical equation is 
Mg + 1/2O2 --> MgO
24g    16 g        40g

From the above equation, it is clear that,
24 f Mg reacts with 16 g O2
thus, 1.0 g Mg reacts with 

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12.

The pair of compounds that can exist together is 

  • FeCl3.SnCl2

  • HgCl2,SnCl2

  • FeCl2,SnCl2

  • FeCl2,SnCl2

1542 Views

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+

952 Views

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

1861 Views

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)

1744 Views

20.

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

  • Mn4+ and O2

  • Mn2+ and O2

  • Mn2+ and O3

  • Mn2+ and O3

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