An alkaline earth metal (M) gives a salt with chlorine, which is insoluble in water at room temperature but soluble in boiling water. It also forms an insoluble sulphate whose mixture with a sulphide of a transition metal is called 'lithopone' - a white pigment. Metal M is :

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Solution

The correct option is C Ba
An alkaline earth metal (M) gives a salt with chlorine, which is insoluble in water at room temperature but soluble in boiling water. It also forms an insoluble sulphate whose mixture with a sulphide of a transition metal is called 'lithopone ' a white pigment. Metal M is $B a$ .
The salt with chlorine is barium chloride $B a C l_{2}$ .
The insoluble sulphate is barium sulphate $B a S O_{4}$ . Lithopone is an insoluble mixture of barium sulfate and zinc sulfide that precipitates upon mixing solutions of barium sulfide and zinc sulfate. The precipitate is recovered by filtration, then calcined (roasted) at temperatures above $600^{o} C$ .

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Similar questions

Q. An alkaline earth metal 'M' readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. M is :-

Name :

(a) a chloride which is insoluble in cold water but dissolves in hot water,

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(d) a basic salt,

(e) an acidic salt,

(f) a mixed salt,

(g) a complex salt,

(h) a double salt,

(i) a salt whose solubility increases with temperature,

(j) a salt whose solubility decreases with temperature.

Q. Which of the following salts is insoluble in water at room temperature but soluble in boiling water?

A metal M readily forms sulphate $M S O_{4}$ which is water insoluble. It forms oxide MO which becomes inert on heating. It forms insoluble hydroxide which is soluble in NaOH. The metal M is:

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X

and

Y

belong to the second group of the periodic table.

X

forms insoluble oxide but soluble sulphate.

Y

forms a soluble oxide but insoluble sulphate. The hydroxide of metal

X

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N a O H

while that of metal

Y

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Y

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