The sum of first terms of the series
is
when is even. When is odd the sum is
Let n=2m
=> to 2m terms=
Now sum of odd terms is
=>
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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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