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Q.

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R). 

A precipitate of Mg (OH)2 attains blue color when precipitated in presence of magneson reagent.

Methylene blue dye is negative sol.

In the light of the given statements, choose the correct answer from the options given. 

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a

Both (A) and (R) are true and (R) is the correct explanation of (A)

b

Both (A) and (R) are true but (R) is not the correct explanation of (A)

c

(A) is true but (R) is false

d

Both (A) and (R) are false

answer is C.

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Detailed Solution

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Magneson is azo dye used to confirm the presence of magnesium ion present in a given solution. It's formulae is C12H9N3O4

 A precipitate of Mg (OH)2 attains blue color when precipitated in presence of magneson reagent due to adsorption 

Basic dyes like methylene blue are positively charged sol

(A) is true but (R) is false

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