Let the equation of two ellipses be and , if the product of their eccentricities is , then the length of the minor axis of is
1
2
3
4
and the required length is 4 .
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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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