1 ) An amount of water of mass 20 g at 0 C ( Celsius ) is mixed with 40 g of water at 10 C . Final temperature of mixture is : -
A ) 10 C , B ) 40 C ,
C ) 273 C , D ) None of these ,
Correct Answer : - B ) 40 C ,
Solution : -
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2 ) If the molecule of HCL is totally polar , the observed value of dipole moment is 1.03 D but the experimental value of dipole moment was 6.12 D . Calculate the percentage of ionic character ?
A ) 1.3 % , B ) 17 % ,
C ) 71 % , D ) None of these ,
Correct Answer : - B ) 17 % ,
Solution : -
Dipole moment is the difference in electronegativity of two atoms of a molecule .
µ = 0 , ( For non – polar ) And µ ≠ 0 , ( For polar ) .
So ,
Ionic character = ( Observed / Calculated ) x 100 ,
Ionic character = ( 1.03 D / 6.12 D ) x 100 ,
Ionic character = 17 % , Answer .
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3 ) Calculate the percentage of covalent character of HX having bond length = 1.62 A and observed dipole moment = 0.39 D ?
A ) 1.3 % , B ) 17 % ,
C ) 95 % , D ) None of these ,
Correct Answer : - C ) 95 % ,
Solution : -
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 An amount of water of mass 20 g at 0 C ( Celsius ) is mixed with 40 g of water at 10 C . Final temperature of mixture is : - A ) 10 C , B ) 40 C , C ) 273 C , D ) None of these ,){kind=link}
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