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It is based on the differences in the wetting property of gangue and the ore particle. mostly sulphur ores are used for froath flotaion...........when pine oil is added sulphur ore having greater affinity get wetted by it and forms a froath.and gangue particles get wetted by water and settles down thus they are seperated.....
aldehydes which do not contain a-hydrogen undergoes disproportionation when heated with NaOH.............
in this reaction one molecule of aldehyde get oxidised and the other is reduced..........
oops.sorry i thought it as acceleration due to gravity................
generally the value of g is taken as 9.8 m/s^2
here are the other values
Equator . . . sea level: 9.780 . . . 10 km . . . 9.749 Latitude 45 degrees . . . sea level: 9.806 . . . 10 km . . . 9.775 Pole . . . sea level: 9.832 . . . 10 km . . . 9.801
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