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State the reason for the following(1) Aluminum oxide is called an amphoteric.(2) An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green.(3) Hydrogen gas is not evolved when most metals react with nitric acid.(4) calcium does not occur in free state in nature.(5) Sodium or potassium metals are kept immersed under kerosene. |
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Answer» Answer: --1. OXIDE is known as 'amphoteric oxide' due to its reaction with both acids and bases. ---2.The iron STRIP which dipped in the "blue copper sulphate solution" turned into the "blue solution pale green". This is due to the fact that there is "FORMATION of iron sulphate" takes PLACE inside solution. ----3.When metals reacts with the nitric acid, it is oxidised by nitrate ion and not by hydrogen ion. ---4.Calcium doesn't occur in any 'free state' in nature, because it is "highly reactive in nature". ---5.Sodium and potassium metals are reactive and act VIOLENTLY in presence of air. Explanation: mark me as Braniest |
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