What is microcosmic salt?
- A$Na_2HPO_4 \cdot 2H_2O$
- B$(NH_4)_2HPO_4 \cdot 2H_2O$
- C$Na(NH_4)HPO_4 \cdot 4H_2O$
- DNone of these
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List-$I$ Solid salt treated with dil. $H_2SO_4$ List-$II$ Anion detected $A.$ Effervescence of colourless gas $I.$ $NO_2^-$ $B.$ Gas with smell of rotten egg $II.$ $CO_3^{2-}$ $C.$ Yellowish green gas with pungent and suffocating smell $III.$ $S^{2-}$ $D.$ Brown fumes $IV.$ $Cl^{-}$
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