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Certain blanks spaces are left in the following tables as A & B. Identify each of them.

Lab preparation Reactants used products formed drying agent method of collection
HCl gas NaCl +H2SO4 A Conc.H2SO4 B

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A : The products are sodium hydrogen sulphate (NaHSO4 ) and HCl gas. 

B : HCl gas as collected by the upward displacement of air.

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