Solutions Test 27

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Solutions Test 27

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Weekly Quiz Competition

Question 1
1 / -0

A chemist decided to determine the molecular formula of an unknown compound. He collects following information's:
(I) Compounds contain $$2:1$$ 'H' to 'O' atoms(number of atoms).
(II) Compounds has $$40\%$$ C by mass
(III) Approximate molecular mass of the compound is $$176$$g
(IV) Compound contains C, H and O only.
What is the $$\%$$ by mass of oxygen in the compound?

A
$$53.33\%$$

B
$$88.88\%$$

C
$$33.33\%$$

D
None of these

Solution
Question 2
1 / -0

If a solute A dimerizes in water at 1atm pressure and the boiling point of the solution is 100.52$$^o$$C. If 2 moles of A is added to 1 kg of water and $$K_b$$ for water is 0.52$$^o$$C/molal, calculate the percentage association of A.

A
50

B
30

C
25

D
100
Question 3
1 / -0

For a very dilute solution of $$H_3PO_3$$ van't Hoff factor is.

A
$$i = 7$$

B
$$i = 3$$

C
$$i = 4$$

D
$$i = 5$$

Solution
Question 4
1 / -0

Acetic acid exists in benzene solution in dimer form. In an actual experiment, the van't Hoff factor was found to be $$0.52$$. Then the degree of association of acetic acid is.

A
$$0.48$$

B
$$0.88$$

C
$$0.96$$

D
$$0.52$$

Solution
Question 5
1 / -0

What is the molality of an aqueous solution,whose relative lowering of vapour pressure is 0.1

A
2m

B
2.75m

C
3.25m

D
5.56m

Solution
Question 6
1 / -0

50L of a certain liquid is confined in a piston system at the external pressure 100 atm. This pressure is suddenly released and liquid is expanded against the constant one atmosphere pressure, volume of the liquid increases by 1L and the final pressure on the liquid is 10 atm. Find the magnitude of work done.

A
$$1\ L\ atm$$

B
$$5\ L\ atm$$

C
$$50\ L\ atm$$

D
$$500\ L\ atm$$
Question 7
1 / -0

A sphere of diameter 7 cm and mass 266.5 g floats in a both of liquid. As the temperature is raised, the sphere just sinks at a temperature of 35 C. If the density of the liquid at 0 C is $$1.527 g cm^{-3}$$, then the coefficient of a cubical expansion of the liquid is

A
0.0043/C

B
0.00083/C

C
0.00025/C

D
0.00010/C
Question 8
1 / -0

The Vant Hoff factor (i) for a dilute solution of $$K_3[Fe(CN)_6]$$ is (Asuming $$100\%$$ ionsation):

A
10

B
4

C
5

D
0.25

Solution
Question 9
1 / -0

Which of the following has maximum van't Hoff factor?

A
90% ionized $$K_{2}SO_{4}$$

B
60% ionized $$NaCI$$

C
50% ionized $$K_{4}[Fe(CN)_{6}]$$

D
100% ionized $$KOH$$
Question 10
1 / -0

What is the Van't Hoff factor of 50% ionized $$K_{2}SO_{4}$$ ?

A
1

B
1.5

C
2

D
2.5