1.

A partially dried clay mineral contaisn 8% water. The original the partially contained 12% water and 45% silica. The % of silica in the partially dried sample is nearly:

Answer»

0.5
0.49
0.55
0.47

Solution :`{:("Initial STAGE","Clay","SILICA","Water"),(,43%,45%,12%),("Final stage",(92.x),x,8%):}`
Ratio of silica and clay will REMAIN CONSTANT, before and after drying.
`therefore (45)/(43)=(x)/(92-x)`
`x=47%`.


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