**Match the mixtures with the property that remains constant:**

**Column I:**
(A) Dilution of a solution
(B) Mixing two solutions of the same solute
(C) Chemical reaction in a clos

Question

**Match the mixtures with the property that remains constant:**

**Column I:**
(A) Dilution of a solution
(B) Mixing two solutions of the same solute
(C) Chemical reaction in a closed vessel
(D) Phase change ($H_2O(l) \rightarrow H_2O(g)$)

**Column II:**
(P) Total mass
(Q) Total moles of solute
(R) Total number of atoms
(S) Molarity

Prashant Kotian · Accepted Answer

Correct answer: (A) $\RIGHTARROW$ P, Q, R
(B) $\RIGHTARROW$ P, Q, R
(C) $\RIGHTARROW$ P, R
(D) $\RIGHTARROW$ P, R. **(A & B)** In dilution or mixing, mass, moles of solute, and atoms are conserved; molarity changes.
**(C)** In a chemical reaction, mass and atoms are conserved; moles of molecules may change.
**(D)** In phase change, mass and total atoms are conserved; volume and density change.

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