An alloy consists of rubidium and one of the other alkali metals. A sample of `4.6g` of the alloy when allowed to react with water, liberates `2.241dm^(3)` of hydrogen at `STP`. Relative atomic masses: `A_(T)(Li)=7,A_(T)(Na)=23,A_(T)(K)=39,A_(T)(Rb)=85.5,A_(T)(Cs)=1.33` Which alkali metal is the component of the alloy?

An alloy consists of rubidium and one of the other alkali metals. A sa

1.	An alloy consists of rubidium and one of the other alkali metals. A sample of `4.6g` of the alloy when allowed to react with water, liberates `2.241dm^(3)` of hydrogen at `STP`. Relative atomic masses: `A_(T)(Li)=7,A_(T)(Na)=23,A_(T)(K)=39,A_(T)(Rb)=85.5,A_(T)(Cs)=1.33` Which alkali metal is the component of the alloy?
Answer» Correct Answer - `M-alkali metal Reaction:`2M+2H_(2)Orarr2MOH+H_(2)` `n(H_(2)):0.1`mol `n(M):0.2`mol Mean molar mass: `M=(4.6g)/(0.2mol)=23gmol^(-1)`

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