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NVAEasyJEE 2023Concentration Terms (Molarity, Molality, etc.)

JEE Chemistry 2023 Question with Solution

The number of units, which are used to express concentration of solutions from the following is: _____

Mass percent, Mole, Mole fraction, Molarity, ppm, Molarity.

Answer

Correct answer:5

Step-by-step solution

Standard Method

Given: The listed terms are Mass percent, Mole, Mole fraction, Molarity, ppm, Molarity.

Find: The number of units used to express concentration of solutions.

The concentration units among the given terms are:

  • Mass percent
  • Mole fraction
  • Molarity
  • ppm
  • Molarity

Mole is not a concentration unit; it is an amount-of-substance unit.

Therefore, the number of units used to express concentration of solutions is 55.

Common mistakes

  • Counting Mole as a concentration unit. This is wrong because mole measures amount of substance, not concentration. Count only quantities that relate solute amount to solution or solvent.

  • Ignoring the repeated term Molarity. This is wrong because the question asks for the number of units listed from the following items. So the repeated appearance is still counted in the given list.

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