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Mole Concept and Avogadro's Number

The valency o...

Question

The valency of sulphide and oxide ions is:

A

- 2

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B

- 3

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C

- 4

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D

- 5

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Solution

The correct option is A $- 2$
The valency of sulphide and oxide ion is $- 2.$

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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

H_{2} S O_{4}

is a strong oxidizing agent. Reason: Concentrated

H_{2} S O_{4}

oxidises sulphide ions to sulphur trioxide.

Q. The number of valence electrons in a sulphide ion, S^2–, is :

(a) 16

(b) 10

(c) 9

(d) 8

Q. Assertion :In the coagulation of negatively charged arsenic sulphide sol, the coagulating power decreases in the order

A l^{3 +} > B a^{2 +} > N a^{+}

. Reason: Generally, greater the valency of coagulating ion, the greater is its power of coagulation.

Q. The chemical formula of sulphide of an element ‘X’ having valency 3 is

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