PART -D
IV. Answer ALL the following questions: 5 X 5 = 25
15.(a) 1.0g of non-electrolyte solute dissolved in 50g of benzene lowered the freezing point of
benzene by 0.4K. Find the molar mass of the solute. (Given - Freezing point depression constant of
benzene =5.12Kkg/mol)
(b) How solubility of a gas in liquid varies with
i) Temperature ii) Pressure ( 3 + 2 )
16. (a) Calculate the equilibrium constant for the reaction
Cu(s) + 2Ag+
(aq) -------Cu+2(aq) 2Ag+
(s) Eo
cell =0.46 V
(b) Write the symbolic representation of standard hydrogen electrode and give its standard
potential value.
17.(a) How do you convent arylhalide to diphenyl? Write the equation and name the reaction.
(b) Write SN2 mechanism of the conversion of methyl chloride to methyl alcohol.
(3+2)
18.(a) How is benzoyl chloride converted into benzaldehyde. Name the reaction.
(b) Write the chemical equation for the reaction between dilute NaOH and acetaldehyde, mention
the name of the product.
19. (a) Explain how is Hinsberg's regent is used to distinguish the primary, secondary and tertiary
amines.
(b) Write the chemical reaction involved in the conversion of aniline into phenol.
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