Practice free Solutions (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The Henry's law constant ($K_H$) values of three gases (A, B, C) in water are $145$, $2\times 10^{-5}$ and $35$ kbar, respectively. The solubility of these gases in water follow the order:
Solubility $\propto 1/K_H$; B has the smallest $K_H$, A the largest.
The plot of osmotic pressure ($\Pi$) vs concentration ($\text{mol L}^{-1}$) for a solution gives a straight line with slope $25.73\ \text{L bar mol}^{-1}$. The temperature at which the osmotic pressure measurement is done is:
(Use $R = 0.083\ \text{L bar mol}^{-1}\text{K}^{-1}$)
$\Pi = MRT$, slope $= RT = 25.73$, $T = 25.73/0.083 = 310$ K $= 37^\circ$ C.
Match List-I with List-II:
List-I (Example) — A. Humidity, B. Alloys, C. Amalgams, D. Smoke
List-II (Type of Solution) — I. Solid in solid, II. Liquid in gas, III. Solid in gas, IV. Liquid in solid
Choose the correct answer:
Humidity = liquid in gas (II); Alloys = solid in solid (I); Amalgams = liquid (Hg) in solid (IV); Smoke = solid in gas (III).
Which of the following aqueous solution will exhibit highest boiling point?
Boiling-point elevation $\propto i\times m$. Effective concentrations: urea 0.01, KNO₃ 0.02, Na₂SO₄ 0.03, glucose 0.015. Na₂SO₄ ($i=3$) is highest.
5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?
Ideal (Raoult) pressure $= \tfrac13(63)+\tfrac23(78) = 73$ torr. Observed 70 torr < 73 torr → negative deviation.
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