Question

Question 5
(a) Account for the following:
(i) Though lead is above hydrogen in the activity series, it is not used to prepare hydrogen
(ii) Potassium and sodium are not used to react with dil. HCl or dil. H2SO4 in the lab. preparation of hy
(iii) Isotopes of an element possess identical chemical properties.
(b) Distinguish by flame test : Sodium chloride and potassium chloride.
(c) State the effect of temperature on solubility of the following:
(i) Calcium sulphate
(ii) Potassium nitrate
(iii) Sodium chloride
(d) Define 'decomposition reaction'. Write an equation in each case
(i) Thermal decomposition
(ii) Decomposition by electricity​

Answer 1

Answer:

I) lead is not used in the preparation of hydrogen because lead reacts with dilute sulphuric or hydrochloric acid and forms an insoluble coating of lead sulphate or lead chloride. therefore, the further reaction is prevented.

2) Because sodium and potassium are very reactive metals so they react explosively with HCL and H2SO4 evolving a large amount of heat...

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