If the ratio of the coefficient of third and fourth term in the expansion of is 1 : 2, then the value of n will be
18
16
12
-10
But according to the equation
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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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