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3(i)On adding BaCl2 solutions to a portion of saturated Na2CO3 precipitate is formed,precipitate dissolves on adding excess dilute HCl
3 (ii) Q is reducing agent like SO2, H2S, CO
3bi calcium oxide(Cao)
(ii) concentrated H2SO4
3c NaOH pellet is delinquescent because it absorb moisture from the atmosphere to form solution
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