The locus of the centre of a circle which touches externally the circle and also touches the y-axis, is given by the equation
Let the centre be (h, k), then radius
Also,
Thus, locus of
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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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