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Chemical Bonding And Molecular Structure

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Question
CBSEENCH11008197
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Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is

  • SO2 < P2O3 < SiO2 < Al2O3

  • Al2O3 < SiO2 < P2O3 < SO2

  • Al2O3 < SiO2 < SO2 < P2O3

  • SiO2 < SO2 < Al2O3 < P2O3

Solution

B.

Al2O3 < SiO2 < P2O3 < SO2

While moving along a group from top to bottom acidic nature of oxides decreases and along a period left to right, acidic nature increases. 
Al, Si, P, S

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Question
CBSEENCH11008159
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Among the following mixtures, dipole-dipole as the major interaction is present in

  • benzene and ethanol

  • acetonitrile and acetone

  • KCl and water

  • benzene and carbon tetrachloride

Solution

B.

acetonitrile and acetone

Question
CBSEENCH11008090
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Among the following, the maximum covalent character is shown by the compound

  • FeCl2

  • SnCl2

  • AlCl3

  • MgCl2

Solution

C.

AlCl3

The covalent character in ionic compounds is governed by Fazanís Rule.
(i) larger the charge on the ions.
(ii) smaller the size of anions.
(iii) larger the size of anion.
(iv) larger the polarizing power larger the covalent character.
AlCl3 will show Maximum covalent character on account of the higher polarising power of Al3+ because of its having higher positive charge and smaller size.

Question
CBSEENCH11008163
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In Fe(CO)5, the Fe – C bond possesses 

  •  π-character only

  • both σ and π characters

  • ionic character

  • σ-character only 

Solution

B.

both σ and π characters

Question
CBSEENCH11008161
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In which of the following molecules/ions are all the bonds not equal?

  • SF4

  • SiF4

  • XeF4

  • BF4−

Solution

A.

SF4

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