1.

{:("SET-1","SET-2"),((1)"Ostwald-walker",(A) "Osmotic pressure"),((2)"Cotrell's method",(B)"Depression of F.P"),((3)"Rast's camphor method","(C) Elevation of B.P"),((4)"Berkeley and Hartley's method",(D)"Lowering of vapour pressure" ):}

Answer»

`{:(A,B,C,D),(4,3,2,1):}`
`{:(A,B,C,D),(1,2,3,4):}`
`{:(A,B,C,D),(2,3,4,1):}`
`{:(A,B,C,D),(2,4,3,1):}`

ANSWER :A


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