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Oxidation States

Statement 1 S...

Question

Statement 1 (S1): Phosphide ion is an example of a polyatomic ion.
Statement 2 (S2): Phosphide ion combines with 2 cations, hence it has a valency of 2.

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Solution

The correct answer is option (b).

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Similar questions

An element ‘X’ has a valency 1.

Write the chemical formula of its phosphide.

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

Statement 1 (S1): Ammonium ion carries +1 charge.
Statement 2 (S2): A group of atoms carrying a net positive charge is known as a polyatomic cation.

Q. The valencies of sulphide ion and phosphide ion are ____ and ____ respectively.

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