If the ratio of the 7 th term from the beginning to the 7 th term from the end in the expansion of , then x is
9
6
12
None of these.
7th term from the end in
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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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