[" In which ratio of volumes "0.4MHCl" a...

[" In which ratio of volumes "0.4MHCl" and "0.9MHCl" are to "],[" be mixed such that the concentration of the resultant "],[" solution becomes "0.7M],[[" (a) "4:9," (b) "2:3],[" (c) "3:2," (d) "1:1]]

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