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(a) What is an ion ? How is an ion forme...

(a) What is an ion ? How is an ion formed ? Explain with the help of two examples of different ions.
(b) The valencies (or charges) of some of the ions of are given below :

Using this information, write down the formulae of the following compunds :
(i) Sodium phosphate , (ii) Ammonium sulphate
(iii) Calcium hydroxide , (iv) Lead bromide

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