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Q.

20 gm of a mixture of NaCl and NaOH exactly requires 7.3 gm HCl for complete reaction. The mass percent of NaCl in the original mixture is:

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a

60 %

b

50 %

c

80 %

d

40 %

answer is B.

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Detailed Solution

In the given reaction we have,

nHCl=nNaOH=7.336.5

% NaCl=20−7.336.5×4020×100

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