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Q.

Unknown sample (A) on heating swells up first and aqueous solution of (A) gives white ppt. with NaOH which becomes soluble with excess of NaOH addition —

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a

Borax

b

Alum

c

Ammonium salt

d

Magnesium salts

answer is B.

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Detailed Solution

K2SO4.Al2(SO4)3.24H2O→swells∆K2SO4+Al2(SO4)3Amorphous power+24H2OK2SO4.Al2(SO4)3.24H2O+8NaOH→2KOHsoluble + 2Al(OH)3(white ppt.)↓+4Na2SO4soluble→ Excess of NaOH[Al(OH)4]-soluble
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