Question 11
Generally, metallic oxides are basic and non-metallic oxides are acidic in nature. The solution of which of the following oxides in water will change the colour of blue litmus to red?

(a) sulphur dioxide
(b) magnesium oxide
(c) iron oxide
(d) copper oxide

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Solution

(a) sulphur dioxide

Sulphur dioxide is the non-metallic oxide among the given options. It is acidic in nature. The solution of sulphur dioxide in water will change the colour of blue litmus to red.

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Fill in the following balnks with suitable words:

(a) Metals are ........................... conductors of heat and ............................

(b) Most non-metals are ........................... conductors of heat and ...........................

(d) Metals react with acids to produce ........................... gas.

(e) Iron is more ........................... than copper.

(f) Metals form ........................... oxides whereas non-metals form ........................... oxides.

(g) Sulphur forms ........................... oxide whereas magnesium forms ........................... oxide.

(h) A non-metal is used to make an antiseptic solution called tincture ...........................

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