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Reaction of Metals with Bases

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Question

It has been said that there are only 2 oxides dissolving in water which are pottassium oxide making pottassium hydroxide and sodium oxide making sodium hydroxide. But what about calcioum hydroxide, magnesium hydroxide and ammonium hydroxide?

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Solution

Generally metal oxides are insoluble in water. Calcium oxide reacts with water to form calcium hydroxide, so oxide of sodium, potassium and calcium are soluble in water. Ammonium hydroxide is not a metallic oxide, it is a non-metallic oxide.

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Hot concentrated sodium hydroxide reacts with lead hydroxide to produce lead oxide, sodium oxide and water.

Q. When water is added to magnesium oxide ,magnesium hydroxide is produced which is also present in lime water .So, is it correct that the magnesium hydroxide present in lime water and the magnesium hydroxide formed from magnesium oxide and water are one and the same?

Q. Few statements regarding the properties of bases are given below. Mark the correct statements
(i) Sodium hydroxide and potassium hydroxide are soluble in water.
(ii) Calcium hydroxide and magnesium hydroxide are partially soluble in water.
(iii) All metallic hydroxides react with acids to form their respective metallic salts.
(iv) Metallic oxides are acidic oxides hence they react with acids to form salts.

Identify the odd one out and justify.

(a) Chloride, nitrate, hydride, ammonium

(b) Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia

(c) Acetic acid, carbonic acid, hydrochloric acid, nitric acid

(d) Ammonium chloride, sodium chloride, potassium nitrate, sodium sulphate

(e) Sodium nitrate, sodium carbonate, sodium sulphate, sodium chloride

(f) Calcium oxide, magnesium oxide, zinc oxide, sodium oxide.

(g) Crystalline blue vitriol, crystalline common salt, crystalline ferrous sulphate, crystalline sodium carbonate.

(h) Sodium chloride, potassium hydroxide, acetic acid, sodium acetate.

Q. What happens when aluminium oxide dissolves in aqueous sodium hydroxide.

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