Chemistry Test 85

Result

Chemistry Test 85

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Weekly Quiz Competition

Question 1
4 / -1

In an ideal solution partial v.p. of methanol and ethanol are 2.8 and 4.2 kPa respectively the mole fraction of ethanol in vapour at equilibrium is :-

A
0.67

B
0.33

C
0.4

D
0.6

Solution

P_EOH = Y_EOH P_S

P_S = P_EOH + P_MOH= 2.8 + 4.2 = 7.0

Y_EOH = P_EOH/ P_S= 4.2 / 7 = 0.6
Question 2
4 / -1

Which one of the following pair of solution are not isotonic at same temperature ?

A
0.2 M urea and 0.1 M-NaCl

B
0.3 M urea and 0.1 M-MgCl₂

C
0.1 M Na₂SO₄ and 0.1 M NaCl

D
0.1 M Na₂SO₄ and 0.1 M-Ca(NO₃)₂

Solution

0.1 × 3 ≠ 0.3 × 3

C₁i₁ ≠ C₂i₂