Assertion and reason

Exercise and reference answers

Questions

1. Reason

   It is defined by mass, which does not change when the solution is warmed.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Molality is preferred for work over a temperature range.

2. Reason

   They depend on the number of particles, which relates count to mass.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Colligative properties can reveal a solute's molar mass.

3. Reason

   Concentration expresses how much solute is present.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   Molarity is defined per kilogram of solvent.

Explanation