Test Preparation on IIT JEE Mains Mock Test-8

1.

CHEMISTRY
Two radio active nuclides A and B have half lives
of 20 and 10 minutes respectively. If one starts an
experiment with one mole of each of them their
mole ratio after a time interval of one hour will be

Amount of A (t ½ =20 min.) left after one hour or 3 half life periods = 1→1/2 →¼ → 1/8
Amount of A (t ½ =10 min.) left after one hour or 6 half life periods =
1→1/2 → ¼ → 1/8→1/16 →1/32→ 1/64

 

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