The radius of the smallest circle that can be drawn to pass through the point (0,4) and touching the x-axis is
-1
-2
2
4
when α = 0, smallest radius = 2.
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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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