100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is: (Molar mass of calcium bicarbonate is 162 g.mol-1 and magnesium bicarbonate is 146 g.mol-1)

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JEE Mains Previous Paper 1 (Held On: 08 Apr 2019 Shift 1)
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  1. 5,000 ppm
  2. 1,000 ppm
  3. 100 ppm
  4. 10,000 ppm

Answer (Detailed Solution Below)

Option 4 : 10,000 ppm
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JEE Main 04 April 2024 Shift 1
90 Qs. 300 Marks 180 Mins

Detailed Solution

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Concept:

The basic formula of Parts per Million is:

The degree of hardness and the weight are interrelated. Thus,

Calculation:

∴ Degree of hardness=1

Now,

PPM = 10000 ppm

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