Q2 of 53 Page 1

Name the method that is used for refining of nickel.

Nickel is purified by Mond’s process. In this method Nickel form volatile complex Nickel carbonyl with CO which decomposes on further heating to give pure nickel. The reactions involved in this process is shown as below:



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30

(a) Write the products formed when CH3CHO reacts with the following reagents:

(i) HCN


(ii) H2N-OH


(iii) CH3CHOin the presence of dilute NaOH


(b) Give simple chemical tests to distinguish between the following pairs of compounds:


(i) Benzoic acid and Phenol


(ii) Propanal and Propanone


OR


(a) Account for the following:


(i) Cl-CH2COOH is stronger acid than CH3COOH


(ii) Carboxylic acids do not give reactions of carbonyl group.


(b) Write the chemical equations to illustrate the following name reactions:


(i) Rosenmund reduction


(ii) Cannizzaro’s reaction


(c) Out ofCH3CH2-CO-CH2CH3 and CH3CH2-CH2-CO-CH3, which gives iodoform test?


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Why is adsorption always exothermic ?

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Why does NO2 dimerise ?

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Based on molecular forces what type of polymer is neoprene ?