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Compounds

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Question

State the formula and valency of ammonium ion.

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Solution

Explanation:
Valency: Valency refers to the number of electrons that are gained or lost by an atom in order to complete its outermost shell.
Ammonium ion has the chemical formula of ${NH}_{4}^{+}$ having valency of +1 in the form of a positive ion.

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Q. (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 are given below :

Ion	Valency (Charge)	Ion	Valency (Charge)
Sodium ion	1+	Bromide ion	1–
Ammonium ion	1+	Hydroxide ion	1–
Calcium ion	2+	Sulphate ion	2–
Lead ion	2+	Phosphate ion	3–

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

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