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Q.

Correct statements among the following

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a

Lapis Lazuli is a precious stone blue in colour

b

Aqueous solutions of alums are acidic in nature.  

c

Alums are prepared by using  K2SO4.Al2(SO4)3.4Al(OH)3

d

CuSO4   Al2(SO4)3    24H2O  belongs to pseudo alum 

answer is A, B, C, D.

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Detailed Solution

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Lapis Lazuli is a precious stone blue in colour
CuSO4   Al2(SO4)3    24H2O   belongs to pseudo alum 
 Alums are prepared by using  K2SO4.Al2(SO4)3.4Al(OH)3
 Aqueous solutions of alums are acidic in nature.

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