A metal ‘X’ loses two electrons and a non-metal ‘Y’ gains one electron. Show the electron dot structure of compound formed between them. Is ionic or covalent? Does it have high melting point or low? Will it conduct electricity in solid state or in aqueous solution and why? Will it be soluble inwater? A student has mixed the solutions of lead (II) nitrate and potassium iodide,(i)What was the colour of the precipitate formed? Can you name the compound precipitated? (ii) Write the balanced chemical equation for this reaction,(iii) What type of reaction is it?
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Since X loses two electrons, its valence becomes +2 and it forms the ion of the form X2+. Similarly, valency of Y is -1 and its ionic form is Y- . Since compound is formed by ions it is ionic. Ionic compounds are High melting points, are soluble in aqueous solutions because of mobile ions and are soluble in water.
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