The rational term in the expansion of is
60
61
62
59
The rth term is
For rational term r is a multiple of 3 i.e.
r = 3m and 5 - 3m is a multiple of 2
Also 5 - 3m >0 Hence m =1
= 60
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50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pKb of ammonia solution is 4.75, the pH of the mixture will be : Option: 1 3.75 Option: 2 4.75
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