Solutions Test 25

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Solutions Test 25

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Weekly Quiz Competition

Question 1
1 / -0

For a binary ideal liquid solution, the total vapour pressure of the solution is given as:

A
$${ P }_{ total }\quad =\quad { P }_{ A }^{ \circ }\quad +\quad \left( { P }_{ A }^{ \circ }\quad -\quad { P }_{ B }^{ \circ } \right) { X }_{ B }$$

B
$${ P }_{ total }\quad =\quad { P }_{ B }^{ \circ }\quad +\quad \left( { P }_{ A }^{ \circ }\quad -\quad { P }_{ B }^{ \circ } \right) { X }_{ A }$$

C
$${ P }_{ total }\quad =\quad { P }_{ B }^{ \circ }\quad +\quad \left( { P }_{ B }^{ \circ }\quad -\quad { P }_{ A }^{ \circ } \right) { X }_{ A }$$

D
$${ P }_{ total }\quad =\quad { P }_{ B }^{ \circ }\quad +\quad \left( { P }_{ B }^{ \circ }\quad -\quad { P }_{ A }^{ \circ } \right) { X }_{ B }$$

Solution
Question 2
1 / -0

When non-volatile solute is added to a pure solvent, the

A
vapour pressure of the solution becomes lower than the pressure of the pure solvent.

B
rate of evaporation of solvent is reduced

C
solute does not affect the rate of condensation

D
none of these

Solution
Question 3
1 / -0

A mixture of $$KCl$$ and $$KClO_3$$ weighing $$1.8$$ gms was heated . After the reaction, the dry oxygen gas generated occupied $$140$$ ml at STP. What percent of original mixture was $$KClO_3$$?

A
$$28.4\%$$

B
$$37.5\%$$

C
$$42.6\%$$

D
$$64.8\%$$

Solution
Question 4
1 / -0

The reduction potential of hydrogen electrode will be positive if

A
$${P_{{H_2}}} = 2\;atm;\left[ {H^ + } \right] = 1\;M$$

B
$${P_{{H_2}}} = 2.5\;atm;\left[ {H^ + } \right] = 1.5\;M$$

C
$${P_{{H_2}}} = 2.5\;atm;\left[ {H^ + } \right] = 1\;M$$

D
$${P_{{H_2}}} = 1\;atm;\left[ {H^ + } \right] = 2\;M$$

Solution
Question 5
1 / -0

For an ideal solution with $$P_A$$ > $$P_B$$ , which of the following is true?

A
$$X_A(l)$$ = $$X_A(v)$$

B
$$X_A(l)$$ > $$X_A(v)$$

C
$$X_A(l)$$ < $$X_A(v)$$

D
No relationship in their mole fraction
Question 6
1 / -0

18 g of glucose $${ (C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 })$$ is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at $${ 100 }^{ \circ }C$$ is ?

A
7.60 Torr

B
76.00 Torr

C
752.40 Torr

D
759.00 Torr

Solution
Question 7
1 / -0

Calculate solubility (in moles / litre) of a saturated aqueous solution of $$Ag_3PO_4$$ if the vapour pressure of the solution becomes 750 torr at 373 K
(Assume molality=molarity).

A
$$2/15$$

B
$$1/30$$

C
$$10/54$$

D
$$20/27$$

Solution
Question 8
1 / -0

The solubility of a specific non-volatile salt is $$4g$$ in $$100g$$ of water at $$25^{\circ} C$$. If $$2.0g,4.0g$$ and $$6.0g$$ of the salt added of $$100g$$ of water at $$25^\circ C$$, in system X, Y and Z. The vapour pressure would be in the order:

A
$$X<Y<Z$$

B
$$X>Y>Z$$

C
$$Z>X>Y$$

D
$$X>Y=Z$$

Solution
Question 9
1 / -0

Liquids $$A$$ and $$B$$ form an ideal solution. At $$30^o$$ C, the total vapour pressure of a solution containing $$1$$ mol of $$A$$ and $$2$$ mols of $$B$$ is $$250$$ mm $$Hg$$. The total vapour pressure becomes $$300$$ mm $$Hg$$ when $$1$$ more mol of A is added to the first solution. The vapour pressures of pure $$A$$ and $$B$$ at the same temperature are

A
$$450, 150$$ mm $$Hg$$

B
$$150, 450$$ mm $$Hg$$

C
$$250, 300$$ mm $$Hg$$

D
$$125, 150$$ mm $$Hg$$

Solution
Question 10
1 / -0

Consider a binary mixture of volatile liquids. If at $$X_A=0.4$$ the vapour pressure of solution is $$580\ torr$$ then the mixture could be $$(p_{A}^{0}=300\ torr, p_{B}^{0}=800\ torr)$$

A
$$CHCl_3-CH_3COCH_3$$

B
$$C_6H_5Cl-C_6H_5Br$$

C
$$C_6H_6-C_6H_5CH_3$$

D
$$nC_6H_{14}-nC_7H_{16}$$

Solution