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(a) (i) Give reasons for the following :
(I) Covalent compounds are poor conductor of electricity.
(II) Soap does not form lather in hard water.
(III) Carbon shows catenation but silicon does not.
(ii) Write chemical equations for the following :
(I) Oxidation of ethanol by acidified $\ce{K2Cr2O7}$.
(II) Hydrogenation of ethene.
(I) Covalent compounds are poor conductor of electricity.
(II) Soap does not form lather in hard water.
(III) Carbon shows catenation but silicon does not.
(ii) Write chemical equations for the following :
(I) Oxidation of ethanol by acidified $\ce{K2Cr2O7}$.
(II) Hydrogenation of ethene.
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(a) (i)
(I) They do not give rise to charged particles/ ions. (1)
(II) Soap reacts with calcium and magnesium salts present in
hard water and forms insoluble substances called Scum. (1)
(III) C-C bonds are strong and stable whereas Si-Si bonds are
relatively weak. (1)
(ii) (I) $\ce{CH3CH2OH ->[acidified K2Cr2O7+heat] CH3COOH}$ (1)
(II) $\ce{CH2=CH2 + H2 ->[Ni] CH3-CH3}$ (1)
(I) They do not give rise to charged particles/ ions. (1)
(II) Soap reacts with calcium and magnesium salts present in
hard water and forms insoluble substances called Scum. (1)
(III) C-C bonds are strong and stable whereas Si-Si bonds are
relatively weak. (1)
(ii) (I) $\ce{CH3CH2OH ->[acidified K2Cr2O7+heat] CH3COOH}$ (1)
(II) $\ce{CH2=CH2 + H2 ->[Ni] CH3-CH3}$ (1)