Q76
neet_2024_05_may_morning
Concentration Terms and Henry's Law
Identify the correct statements:
(A) The molality of 2.5 g of ethanoic acid (Molar mass: 60 g mol⁻¹) in 75 g of benzene solution is 0.556 m.
(B) The molarity of a solution containing 5 g of NaOH (molar mass: 40 g mol⁻¹) in 450 mL of solution is 0.278 M at 298 K.
(C) Aquatic species are more comfortable in cold water.
(D) The solubility of gas increases with decrease in pressure.
(E) For a binary mixture of A and B, the number of moles of A and B are nA and nB respectively. The mole fraction of B will be xB = (nA)/(nA × nB).
Choose the correct answer from the options given below:
Solution
Related Formula
m = (wB)/(MB) × (1000)/(wA(g)), M = (wB)/(MB) × (1000)/(V(mL))Core Logic
(A) m = (2.5)/(60) × (1000)/(75) = 0.556 m (Correct). (B) M = (5)/(40) × (1000)/(450) = 0.278 M (Correct). (C) Lower temp higher gas solubility more O₂ in cold water (Correct). (D) Gas solubility increases with increase in pressure (Incorrect). (E) xB = (nB)/(nA + nB) (Incorrect).
Step 1: Conclusion
Statements A, B and C are correct (Option 2).
Pattern Recognition
Verify numerical formulas for molality, molarity, and Henry's law temperature dependence.
Chapter Mix
Class 12 Chemistry: Solutions
