Solutions Test 26

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Solutions Test 26

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Weekly Quiz Competition

Question 1
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A $$0.010 g$$ sample of $$\mathrm { Cr } \left( \mathrm { NH } _ { 3 } \right) _ { 4 } \left( \mathrm { SO } _ { 4 } \right) \mathrm { Cl }$$ is dissolved in $$25.0\mathrm { mL }$$ of water and the osmotic pressure of the solution is $$59.1 \ \text{torr}$$ at $$25 ^ { \circ } \mathrm { C }.$$ How many moles of ions are produced per mole of compound?

A
$$1$$

B
$$4$$

C
$$2$$

D
$$3$$

Solution

solution:
$$\pi = iCRT = \dfrac{59.1}{760} atm$$

$$c = molarity = \dfrac{no.\ of\ moles}{volume } \times 1000$$

$$c=$$ (weight of given solute / (mol. mass x 25) ) x 1000

$$\pi=\dfrac {59.1}{760} = i \times \dfrac{0.010 \times 1000 }{251.5 \times 25} \times 0.0821 \times 298$$

$$i = \dfrac{59.1 \times 251.5 \times 25 }{0.010 \times 1000 \times 0.0821 \times 298}$$

$$i = 2$$

Hence the correct option: C
Question 2
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Which of the following is satisfied by an ideal solution?

A
Formation of an azeotropic mixture

B
$$ \Delta S_{mix} = 0$$

C
Raoult's law is obeyed under particular set of conditions only

D
$$ \Delta H_{mix} = 0$$

Solution
Question 3
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How much water should be mixed with $$12\mathrm { mL }$$ of methanol to give a $$12\%$$ solution of methanol?

A
$$100\mathrm { mL }$$

B
$$112\mathrm { mL }$$

C
$$1000\mathrm { mL }$$

D
$$88\mathrm { mL }$$
Question 4
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Find the volume of gases evolved by passing $$0.1 A$$ of current for $$965s$$ through an aqueous solution of sodium succinate at $$27 ^ { \circ } { C }$$ $$\&$$ $$1atm$$. Assume $$100\%$$ current efficiency $$\&$$ $$22.4 { L }$$ volume of $$1$$ mole of gas.

A
$$22.4 { mL }$$

B
$$44.8 { mL }$$

C
$$67.2 { mL }$$

D
$$49.23mL$$

Solution
Question 5
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$$10 \mathrm { mL } , 30 \mathrm { mL }$$ and $$60\mathrm { mL }$$ of three liquids are mixed together. What is the concentration in volume percent of the solutes ?

A
$$10 \%$$ and $$60 \%$$

B
$$10 \%$$ and $$30 \%$$

C
$$30 \%$$ and $$60 \%$$

D
None of these

Solution
Question 6
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Which of the following solution is hypertonic at constant identical temperature?

A
1 M Aqueous glucose

B
1 M Benzoic acid in benzene

C
1 M aqueous ammonium phosphate

D
1 M aqueous calcium chloride

Solution
Question 7
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Solubility of NaOH in water:

A
increases with increase in temperature

B
decreases with increase in temperature

C
is not affected by a change in temperature

D
first increases and then decreases with temperature

Solution
Question 8
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The equilibrium constant for the following equilibrium is given at $$0^0C$$:

$$Na_2HPO_4.12H_2O(s)\rightarrow Na_2HPO_4.7H_2O(s)+5H_2O(g); K_p=31.25 \times 10^{-13}$$.

The vapor pressure of water is:

A
$$2 \times 10^{-4}\,atm$$

B
$$5 \times 10^{-4}\,atm$$

C
$$5 \times 10^{-2}\,atm$$

D
$$5 \times 10^{-3}\,atm$$
Question 9
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The relative lowering of vapour pressure of a solution of $$6g$$ of urea in $$90g$$ of water is equal to.

A
$$0.02$$

B
$$0.04$$

C
$$0.60$$

D
$$0.03$$

Solution
Question 10
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When metal 'M' is treated with $$NaOH$$, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of $$NaOH$$. Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is:

A
$$Ca$$

B
$$Al$$

C
$$Fe$$

D
$$Zn$$

Solution