In how many ways can seven balls of different colours be distributed among four children?
16374
16384
16394
16349
Given that,
By the rule of product, this can be done 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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