Q10 of 55 Page 1

Define half-life of a reaction. Write the expression of half-life for

a) Zero order reaction and


b) First order reaction


Half-life of a reaction – it is defined as the time required for certain substance to become half from its initial given amount.


a)


b)


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8

Name the two components of α-glucose which constitute starch.

 9

A solution of is electrolysed between platinum electrodes using a current of 5.0 Ampere, for 20 minutes. What mass of Nickel will be deposited at the cathode?

(Given At mass of Ni = 58.7 g/mol, 1 F = 96500 C/mol)


 11

Write the chemical reactions involved in the extraction of silver from silver ore?

 12

Name two most important allotropes of Sulphur. Which one of the two is stable at room temperature? What happens when the stable form is heated above 370 K?

OR


(i) Write the conditions to maximise the yield of by contact process.


(ii) Why is <<for in water?