The sum of coefficients of even powers of x in the expansion of is
0
Even power of x exists only if 11 − 2 r = an even number not possible
Sum of coefficient = 0
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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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