#### 11th Standard Chemistry Solutions English Medium Free Online Test One Mark Questions 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
1. The molality of a solution containing 1.8g of glucose dissolved in 250g of water is

(a)

0.2 M

(b)

0.01 M

(c)

0.02 M

(d)

0.04 M

2. Which one of the following gases has the lowest value of Henry's law constant?

(a)

N2

(b)

He

(c)

CO2

(d)

H2

3. According to Raoults law, the relative lowering of vapour pressure for a solution is equal to

(a)

mole fraction of solvent

(b)

mole fraction of solute

(c)

number of moles of solute

(d)

number of moles of solvent

4. The empirical formula of a nonelectrolyte(X) is CH2O. A solution containing six gram of X exerts the same osmotic pressure as that of 0.025 M glucose solution at the same temperature. The molecular formula of X is

(a)

C2H4O2

(b)

C8H16O8

(c)

C4H8O4

(d)

CH2O

5. Normality of 1.25M sulphuric acid is

(a)

1.25 N

(b)

3.75 N

(c)

2.5 N

(d)

2.25 N

6. For a solution, the plot of osmotic pressure (p) verses the concentration (c in mol L–1) gives a straight line with slope 310R where 'R' is the gas constant. The temperature at which osmotic pressure measured is

(a)

310 x 0.082 K

(b)

310oC

(c)

37oC

(d)

${310\over 0.082}K$

7. The correct equation for the degree of an associating solute, 'n' molecules of which undergoes association in solution, is

(a)

$\alpha={n(i-1)\over n-1}$

(b)

$\alpha^2={n(1-i)\over (n-1)}$

(c)

$\alpha={n(i-1)\over 1-n}$

(d)

$\alpha={n(1-i)\over n(1-i)}$

8. The example of solid solution is

(a)

glucose in water

(b)

copper in gold

(c)

camphor in nitrogen

(d)

oxygen in nitrogen

9. The blocking of capillaires due to sudden release of bubbles of N2 gas in blood is known as

(a)

bends

(b)

blends

(c)

mends

(d)

all of these

10. The temperature at which the vapour pressure of a liquid equals external pressure is called

(a)

freezing point

(b)

boiling point

(c)

melting point

(d)

critical temperature

11. Vapour pressure is the pressure exerted by vapours

(a)

in equilibrium with liquid

(b)

in any condition

(c)

in an open system

(d)

in atmospheric conditions

12. The value of ebulllescopic constant depends upon

(a)

$\triangle$Hsolution

(b)

nature of solvent

(c)

nature of solute

(d)

freezing point of solution

13. Depression in freezing point for 1 M urea, 1 M NaCI and 1 M CaCI2 are in the ratio of

(a)

1: 2 : 3

(b)

1: 1 : 1

(c)

3: 2 : 1

(d)

Data insufficient

14. Which of the following has maximum freezing point?

(a)

Pure H20

(b)

0.1 M NaCl (aq)

(c)

0.01 M NaCl (aq)

(d)

0.5 M NaCl (aq)

15. What is the .boillng point of 1 molal aqueous solution of NaCI [Kb = 0.52 K molal-I].

(a)

99.48°C

(b)

98.96°C

(c)

100.52°C

(d)

101.04°C

16. The normality of 10% weight/volume) acetic and is

(a)

1 N

(b)

10 N

(c)

1.7 N

(d)

0.83 N

17. If solute and solvent interactions are more than solute - solute and solvent - solvent interactions then

(a)

It is ideal solution

(b)

It is non-ideal solution with positive deviation

(c)

It is non-ideal solution with negative deviation

(d)

Can't be predicted

18. Which of the following statment is true?

(a)

Molarity of solution is idependent of temperature

(b)

Molality of solution is independent of temperature

(c)

Mole fraction of solute is dependent on temperature

(d)

The unit of molality is mol dm-3

19. An azeotropic solution of two liquids has a boiling point lower than either of the boiling points of the two liquids when it

(a)

shows negative deviation

(b)

shows positive deviation

(c)

shows no deviation

(d)

is unsaturated

20. Equimolar solution of non-electrolyte in the same solvent have

(a)

same boiling point and same freezing point

(b)

different boiling point. and different freezing point

(c)

same boiling point but different freezing point

(d)

same freezing point but different boiling point