(iii) What is the common difference (d) of the A.P. 5, 1, -3, -7, ...?
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(1) ionic comopound are solids and hard due to strong electrostatic force of attraction between oppositely charged ions. <br> (2) They are generally brittle. When pressure is applied they break into pieces. <br> (3) They have high melting and boiling points, due to intermolecular force of attraction is high in ionic compounds. <br> (4) They are soluble in water and insoluble in solvents such as keerosen and petrol <br> (5) Ionic compounds cannot conduct electricity when in solid state, they are electrically netural. They conduct electricity in the molten state and also in an equeous solution.
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