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(a) In general, which metals are expecte...

(a) In general, which metals are expected to occur in the native state in nature ?
(b) A certain metal `M` occurs in three compounds namely `X,Y` and `Z.X` has `15 %` of `M,Y` has `66 %` of `M` and `Z` has `71%` of `M`. If we extract `M` from `X, Y` and `Z`, it costs `Rs. 35 per kg, Rs. 45 per kg` and `Rs. 100 per kg` respectively. Out of `X,Y` and `Z` which material can be considered as an ore of `M` ?

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(a) The elements which lie below hydrogen in the electrichemical series are expected to occur in the nature in the native state. For example, `Cu, Ag,Au,Pt` etc.
(b) All three `X,Y` and `Z` are minerals as they contain `M`, but all cannot be called ores. Extraction of `M` from minteral `X` would cost less but but result in very less amount. Similarly, extraction from `Z` would result in large amount, but it will also cost a large sum. Hence `Y` is the appropriate mineral from which `M` should be extracted as it would give sufficient amount and would not even cost much.
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