7.What are alkalies ? Give two examples.
8.Write balanced equations for the reaction of a)Aluminium when heated in air. b)Calcium with water.
9. a)Hydrogen gas is not evolved when a metal reacts with nitric acid. Why? b )Name two metals which react with very dil.HNO3 to evolve H2.
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7.
All bases are not soluble in water.
Bases that dissolve in water are called alkalies. Some examples of alkalies are sodium Hydroxide, calcium hydroxide and potassium hydroxide.
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