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MCQ
Dilute HCl is preferred over conc. H2SO4 in the carbonate test because:
Unit-18 Qualitative Anaylsis
A H2SO4 is more expensive
B H2SO4 gives a brown ring
C insoluble calcium sulfate may stop reaction with some salts
D H2SO4 turns the solution red
Explanation

Conc. H2SO4 can form insoluble CaSO4, hindering the reaction.

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