Two elements A and B on burning in air give corresponding oxides. oxides of both A and B are soluble in water. The aqueous solution of oxide of A is alkaline and reacts with aqueous solution of oxides of B to give another compound. A and B are_____

A and B both are metal

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A and B are non-metal

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A is metal and B is non metal

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A is non metal and B is metal

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Solution

The correct option is C A is metal and B is non metal
A is metal because the oxide of metal dissolves in $H_{2} O$ to form alkaline solution.

The aqueous solution of oxide of element A reacts with aqueous solution of oxide of element B, thus aqueous solution of oxide of element B will be acidic because reaction between two alkalies is not possible.

Therefore element B will be non metal as oxides of non metals are acidic in nature.

Option C is correct.

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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.

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Q. An acid reacts with a solution of a non-metallic oxide to form salt and water.

Name:

(a) two metals which are liquid at room temperature,

(b) metal which do not corrode easily

(d) a non-metal which is lustrous,

(e) a non-metal which conducts electricity,

(f) a metal which is brittle,

(g) two elements which are monoatomic,

(h) two metallic oxides which are acidic,

(i) two metallic oxides which are amphoteric,

(j) two metallic which react with cold water,

(k) the compound responsible for green deposit on the surface of copper,

(l) a non-metal which can form a positive ion,

(m) a non-metal which shows reducing property,

(n) a metal whose oxide is reduced only by carbon.

Question 24.
Which of the following statements is not correct ?

(a) All metal carbonates react with acid to give a salt, water and carbon dioxide
(b) All metal oxides react with water to give salt and acid
(c) Some metals react with acids to give salt and hydrogen
(d) Some non-metal oxides react with water to form an acid

Q. The ratio of non-metal atoms to the number of atoms of two non-metallic oxides A and B are 0.33 and 0.25 respectively. Find the valencies of non-metals present in the those non-metallic oxides.

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