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Two elements A and B combine chemical...

Two elements `A` and `B` combine chemically to from compounds combining with a fixed mass of `A` in I, II and III is `1:3:5`, if 32 parts by mass of `A` combine with 84 parts by mass of `B` in II, then III, 16 parts of `A` will combine with................ by mass of `B`.

A

42 parts

B

70 parts

C

64 parts

D

96 parts

Text Solution

Verified by Experts

The correct Answer is:
B
In II, 32 parts by mass of `A` combine with 84 parts by mass of `B`. Thus, 16 parts by mass of `A` (in II) will combine with 42 parts by mass of `B`. According to the data, different masses of `B` combine with a fixed mass of `A` in II and III are in the ratio `3:5`, i.e.,
`("Mass of B in II")/("Mass of B in III") = (3)/(5)`
`:.` Mass of `B` in III `= (5)/(3) xx` Mass of `B` in `II`
`= (5)/(3) xx 42 = 70` parts
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