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In Fischer-Ringe 's method of separation of nobles gas mixture from air, ................... is used:

\[\begin {array} {1 1} (a)\;90 \% CaC_2+10 \% CaCl_2 & \quad (b)\; coconut\; charcoal \\ (c)\;soda\; lime + potash \;solution & \quad (d)\;90 \%CaCO_3+10 \% urea \end {array}\]

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