NEET Chemistry Redox Reactions Questions Solved


2 gm limestone (CaCO3 + Impurities ) is reacted with 100ml N/2 HCl. The excess acid requires 60ml N/2 NaOH. The % purity of limestone is

1. 25%

2. 50%

3. 75%

4. 100%

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(2) Total milliequivalents of HCl = 100x1/2=50

Left milliequivalents of HCl = 60x1/2=30

Used milliequivalents of HCl = 20

Miliequivalents of pure CaCO3 = Milli w/50x1000=20

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