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A colourless solution of a compound gives a precipitate with AgNO3 solution but no precipitate with a solution of Na2CO3. The action of concentrated H2SO4 on the compouund liberates a suffocating reddish brown gas. The compound is : 

(A) Ba(NO3)

(B) CaCl

(C) NaI 

(D) NaBr

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The compound is NaBr.

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