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Balance the following reactions of: a) Preparation of ethanal by oxidation of ethanol: CH3CH2OH + K2Cr2O7 + H2SO4 =>CH3CHO + K2SO4 + Cr2(SO4)3 + H2O

Balance the following reactions of:

a) Preparation of ethanal by oxidation of ethanol:

CH3CH2OH + K2Cr2O7 + H2SO4 =>CH3CHO + K2SO4 + Cr2(SO4)3 + H2O

b) Oxidation of acetaldehyde:

CH3CHO + KMnO4 + H2SO4 =>CH3COOH + K2SO4 + MnSO4 + H2O

c) Preparation of urotropin by condensation of formaldehyde with ammonia.

HCHO + NH3 =>(CH2)6N4 + H2O

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