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An alkaline earth metal (M) gives a salt with chlorine, which is soluble in water at room temperature. It also forms an insoluble sulphate whose mixture with a sulphide of a transition metal is called `lithopone'-a white pigment. Metal M is-
  • a)
    Ca
  • b)
    Mg
  • c)
    Ba
  • d)
    Sr
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
An alkaline earth metal (M) gives a salt with chlorine, which is solub...
Lithopane is (BaSO4 + ZnS)
white pigment
BaSO4 is insoluble in water
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Most Upvoted Answer
An alkaline earth metal (M) gives a salt with chlorine, which is solub...
Explanation:

Alkaline earth metals are a group of elements in the periodic table that includes beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). These metals have two valence electrons and are highly reactive.

Soluble Chloride Salt:
When an alkaline earth metal reacts with chlorine (Cl), it forms a salt called an alkaline earth metal chloride. This salt is soluble in water at room temperature. In the case of the given question, the metal M reacts with chlorine to form a chloride salt that dissolves in water.

Insoluble Sulphate:
The alkaline earth metals also have a tendency to form insoluble sulphates when they react with sulphuric acid (H2SO4) or any other sulphate compound. In the case of the given question, the metal M forms an insoluble sulphate. This means that when a compound containing M reacts with sulphuric acid or a sulphate compound, a white precipitate of the sulphate is formed.

Lithopone - A White Pigment:
The mixture of the insoluble sulphate of metal M with the sulphide of a transition metal is called lithopone. Lithopone is a white pigment that is commonly used in the production of paints, coatings, and plastics. It provides excellent hiding power, opacity, and weather resistance to the materials it is added to.

Identification of Metal M:
Based on the given information, metal M forms a soluble chloride salt and an insoluble sulphate that is used in the production of lithopone. Among the options given (Ca, Mg, Ba, Sr), only Barium (Ba) forms an insoluble sulphate, while the others form soluble sulphates. Therefore, the correct answer is option 'C' - Ba (Barium).

In summary, the metal M in this question is Barium (Ba), which forms a soluble chloride salt and an insoluble sulphate used in the production of lithopone, a white pigment.
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An alkaline earth metal (M) gives a salt with chlorine, which is soluble in water at room temperature. It also forms an insoluble sulphate whose mixture with a sulphide of a transition metal is called `lithopone'-a white pigment. Metal M is-a)Cab)Mgc)Bad)SrCorrect answer is option 'C'. Can you explain this answer?
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