Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Identify the wrong statement in the following.

  • Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius

  • Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

  • Atomic radius of the elements increases as one moves down the first group of the periodic table

  • Atomic radius of the elements increases as one moves down the first group of the periodic table

890 Views

12.

pA and pB are the vapour pressure of pure liquid components, A and B, respectively of and ideal binary solution. If xA represents the mole fraction of component A, the total pressure of the solution will be

  • pA + xA(pB-pA)

  • pA + xA(pA-pB)

  • pB + xA(pB-pA)

  • pB + xA(pB-pA)

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13.

Which of the following species contains three bond pairs and one lone pair around the central atoms?

  • H2O

  • BF3

  • NH2-

  • NH2-

820 Views

14.

The pair of species with t he same bond order is 

  • O22-, B2

  • O2+, NO+

  • NO, CO

  • NO, CO

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15.

Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

  • [BCl3 and BrCl3]

  • [NH3 and NO3-]

  • [NF3 and BF3]

  • [NF3 and BF3]

751 Views

16.

When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

  • zero to +1 and zero to -5

  • zero to -1 and zero to +5

  • zero to -1 and zero to +5

  • zero to -1 and zero to +5

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17.

In which of the following compounds, nitrogen exhibits highest oxidation state?

  • N2H4

  • NH3

  • N3H

  • N3H

1073 Views

18.

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes a maximum change in the oxidation number?

  • S

  • H

  • Cl

  • Cl

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19.

Which one of the alkali metals, forms only the normal oxide, M2O on heating in air?

  • Rb

  • K

  • Li

  • Li

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20.

Which one of  the following statements regarding photochemical smog is not correct?

  • Carbon monoxide does not play any role in photochemical smog formation

  • Photochemical smog is an oxidising agent in character

  • Photochemical smog is formed through photochemical reaction involving solar energy

  • Photochemical smog is formed through photochemical reaction involving solar energy


D.

Photochemical smog is formed through photochemical reaction involving solar energy

Photochemical smog is formed in warm and sunny climate during day time by the action of sunlight on primary pollutants. It contains nitrogen oxides, ozone, PAN etc. , which are oxidising in nature. so, photochemical smog is an oxidising agent in character. it causes irritation in eyes and throat. 

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