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Potassium Dichromate

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Question

Write the formula and names of the compounds formed between:
a) Potassium and Iodide ion. b) Sodium and Sulphide ion.

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Solution

a. Potassium iodide, KI
b. Sodium sulphide, Na₂S

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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

P b^{2 +}, N_{2}, B, P H_{3}, A g, I^{-}

Name the compound formed from

P b^{2 +}

I^{-}

ions and write a formula for it.

Q. Name the hormone that regulates the sodium and potassium ion metabolism

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