19.9% of au boron atoms are , 80.1 % are . The appoximate atomic mass of Boron is :
10.6
10.7
10.8
10.9
In 100% the atomic mass
19.9% of au boron atoms are and 80.1 % are .
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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