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Amphoteric Oxides of Metals

Zinc metal fo...

Question

Zinc metal forms oxides having both acidic and _________nature.

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Solution

Zinc oxide (ZnO) is amphoteric in nature. Amphoteric oxides behave as both acidic and basic oxides.
Hence, Zinc metal forms oxides having both acidic and basic nature.

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Q. Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide

Q. Name a non-metallic element which
(a) forms acidic and neutral oxides
(b) has a metallic lustre
(c) is a liquid at ordinary temperatures
(d) is a conductor of electricity

Q. Metal A burns in air, on heating, to form an oxide A₂O₃ whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A₂O₃ and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
(a) What is the nature of oxide A₂O₃?
(b) What is the nature of oxide BO?
(c) Name one metal like A.
(b) Name one metal like B.

Q. Indicate if the following statements are true or false.
(a) Oxides of non-metals dissolve in water to form some acids.
(b) Sulphites are salts formed from sulphuric acid.
(c) Phosphoric acid is tribasic.
(d) Nitric acid can only form normal salts.
(e) Hydrochloric acid can form both carbonates and bicarbonate.
(f) Carbonic acid can form both carbonates and bicarbonates.
(g) Water of crystallisation is found in anhydrous salts.
(h) Litmus turns red in the presence of alkalis.
(i) An acid reacts with a carbonate to form a salt, and hydrogen gas is obtained.
(j) Acid taste sweet.
(k) When the metal zinc reacts with hydrochloric acid, a salt called zinc chloride is formed.
(l) when metals react directly with acids, the reaction is called a displacement reaction.
(m) Sulphuric acid has the formula H₂SO₃.
(n) Carbon dioxide gas is given off as a result of displacement reactions between acids and metals.

an element 'A' forms two oxides AO and AO₂. the oxide AO is neutral whereas oxide AO₂ is acidic in nature. would u call element 'A' a metal or non metal?

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