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Concentrationprocess Name of process
A Hydrogen on finely divided palladium 1 Physisorption
B Hydrogen on nickel 2 Chemisorption
C Hydrogen on charcoal 3 occlusion
4 Desorption
A B C
1 1 2 3
2 3 1 4
3 3 2 1
4 4 3 2

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answer is C.

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