MEDIUM
11th CBSE
IMPORTANT
Earn 100

Which one of the following has highest Lewis acid strength?

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Important Questions on Some p-Block Elements

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11th CBSE
IMPORTANT
Pradeep's New Course CHEMISTRY Vol.II>Chapter 11 - Some p-Block Elements>Competition Focus>Q I
The bond dissociation energy of B—F in BF3 is 646 kJ mol-1 whereas that of C—F in CF4 is 515 kJ mol-1. The correct reason for higher B—F bond dissociation energy as compared to that of C—F is-
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11th CBSE
IMPORTANT
Pradeep's New Course CHEMISTRY Vol.II>Chapter 11 - Some p-Block Elements>Competition Focus>Q I
Reaction of diborane with ammonia gives initially
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11th CBSE
IMPORTANT
Pradeep's New Course CHEMISTRY Vol.II>Chapter 11 - Some p-Block Elements>Competition Focus>Q II
When PbO2 reacts with concentrated HNO3, the gas evolved is 
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11th CBSE
IMPORTANT
Pradeep's New Course CHEMISTRY Vol.II>Chapter 11 - Some p-Block Elements>Competition Focus>Q II
When formic acid is treated with concentrated H2SO4, the gas evolved is :
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11th CBSE
IMPORTANT
Pradeep's New Course CHEMISTRY Vol.II>Chapter 11 - Some p-Block Elements>Competition Focus>Q II
PbCl2 is insoluble in cold water. The addition of HCl increases its solubility due to-
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11th CBSE
IMPORTANT
Pradeep's New Course CHEMISTRY Vol.II>Chapter 11 - Some p-Block Elements>Competition Focus>Q II

The repeating structural unit in silicone is-

 

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11th CBSE
IMPORTANT
Pradeep's New Course CHEMISTRY Vol.II>Chapter 11 - Some p-Block Elements>Competition Focus>Q II
The straight chain polymer is formed by-
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11th CBSE
IMPORTANT
Pradeep's New Course CHEMISTRY Vol.II>Chapter 11 - Some p-Block Elements>Competition Focus>Q II
Silicone oil is obtained from the hydrolysis and polymerization of-