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Valency

Write down th...

Question

Write down the valency of the following ions.

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Solution

Nitride ion, $N^{3 -}$ , carries a -3 charge on it. It can combine with 3 cations. Thus, its valency is 3.

Sulphide ion, $S^{2 -}$ , carries a -2 charge on it. It can combine with 2 cations. Thus, its valency is 2.

Oxide ion, $O^{2 -}$ , carries a -2 charge on it. It can combine with 2 cations. Thus, its valency is 2.

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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

Q. (a) What is the difference between a cation and an anion ? Explain with examples.
(b) The valencies (or charges) of some of the ions are given below :

Ion	Valency (Charge)	Ion	Valency (Charge)
Sodium ion	1+	Nitrate ion	1–
Copper ion	2+	Sulphide ion	2–

Using this information, write down the formulae of :
(i) Sodium sulphide
(ii) Copper nitrate

Q. (a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).
(b) An element Y has a valency of 4. Write the formula for its :
(i) chloride
(ii) oxide
(iii) sulphate
(iv) carbonate
(v) nitrate

Q. Write down the valency of the following ions.

Ion	Valency
Phosphate
Calcium
Sulphide
Nitride

Q. Write the valency of the following ions:
(a)

{N a}^{+}

F^{-}

O^{2 -}

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