#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Ten

11th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25

25 x 1 = 25
1. 7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

(a)

NO

(b)

N2O

(c)

CO

(d)

CO2

2. How many moles of water is present in lL of water?

(a)

1

(b)

18

(c)

55.55

(d)

5.555

3. Assertion: The spectrum of Heis expected to be similar to that of hydrogen
Reason: He is also one electron system.

(a)

If both assertion and reason are true and reason is the correct explanation of correct explanation of assertion.

(b)

If both assertion and reason are reason are true but reason is not the correct explanation of assertion

(c)

If assertion is true but reason is false

(d)

If both assertion and reason are false

4. The orbital diagram in which both the Pauli's exclusion principle and Hund's rule are violated is:

(a)

(b)

(c)

(d)

5. Which of the following factor decreases across the period?

(a)

Ionisation energy

(b)

electron affinity

(c)

(d)

electronegativity

6. The effective nuclear charge across the period (from left to right)

(a)

Decreases

(b)

Increases

(c)

First decreases and then increases

(d)

First increases and then decreases

7. When beryllium carbide reacts with water, the product mainly formed is ______

(a)

ethane

(b)

methane

(c)

acetylene

(d)

ethene

8. If temperature and volume of an ideal gas is increased to twice its values, the initial pressure P becomes

(a)

4P

(b)

2P

(c)

P

(d)

3P

9. Consider the following statements
1. Gases are the most compressible state of matter.
2. Gases take the shape of the container.
3. The density of gases is higher than that of liquids
Which of the following statement(s) given above is/ are correct?

(a)

1 & 3

(b)

only 1

(c)

2 & 3

(d)

1 & 2

10. The compressibility factor is given by

(a)

Z=PV

(b)

Z=nRT

(c)

$Z=\frac { nRT }{ PV }$

(d)

$Z=\frac { PV }{ nRT }$

11. An ideal gas expands from the volume of 1 x 10-3 m3 to 1 x 10-2 m3 at 300 K against a constant pressure at 1 x 105 Nm-2. The work done is

(a)

- 900 J

(b)

900 kJ

(c)

270 kJ

(d)

-900 kJ

12. Which among the following is not an extensive property?

(a)

Volume

(b)

internal energy

(c)

Mass

(d)

temperature

13. The direct conversion of A $\rightarrow$ B is difficult Hence it is carried out by the following paths shown:
$\Delta$( A$\rightarrow$ C) = 50 e.u
$\Delta$(C$\rightarrow$ D) = 30 e.u
$\Delta$(B$\rightarrow$D) = 20 e.u. where e.u. is entropy unit, then $\Delta$S (A-B) is

(a)

+ 100 e.u.

(b)

+ 60 e.u

(c)

- 100 e.u

(d)

- 60 e.u.

14. Which one of the following depend on the mass of the system?

(a)

Density

(b)

Mole fraction

(c)

Mass

(d)

Molar mass

15. The process depicted by the equation. $H_2 {O_{(s)}}\rightarrow H_2 O_{(l)}$ ΔH= +1.43 kcal represents

(a)

fusion

(b)

melting

(c)

evaporation

(d)

boiling

16. Which of the following represents physical equilibrium?

(a)

PCl5(g) ⇌ PCl3(g) + Cl2(g)

(b)

H2(g) + 12(g)⇌ 2HI(g)

(c)

H2O(l) ⇌ H2O(g)

(d)

N2(g) + 3H2(g) ⇌ 2NH3(g)

17. In the reaction, 2NH3(g) ⇌ N2(g) + 3H2(g)

(a)

Kp=Kc

(b)

Kp<Kc

(c)

Kp>Kc

(d)

Kp=$\frac{1}{K_c}$

18. Hydrogen molecule (H2) can be dissociated into hydrogen atoms (H). Which one of the following changes will not increase the number of atoms present at equilibrium?

(a)

(b)

increasing the temperature

(c)

increasing the total pressure

(d)

increasing the volume of the container

19. Statement I: Salt solution is an aqueous solution.
Statement II: If water is used as the solvent, the resultant solution is called an aqueous solution.

(a)

Statements I and II are correct but II is not the correct explanation of I.

(b)

Statements I and II are correct and II is the correct explanation of I.

(c)

Statement I is correct but statement II is wrong.

(d)

Statement I is wrong but statement II is correct.

20. Which of the following shows negative deviation from Raoult's law?

(a)

Phenol and aniline

(b)

Benzene and toluene

(c)

Acetone and ethanol

(d)

Benzene and acetone

21. Statement I: A solution of potassium chloride in water deviates from ideal behavior.
Statement II : The solute dissociates to give K+ and Cl- ion which form strong ion dipole interaction with water molecules

(a)

Statement I& II are correct and II is the correct explanation of I

(b)

Statement! & IIare correct but II is not correct explanation of I

(c)

Statement I is correct but statement II is wrong.

(d)

Statement I is wrong but statement II is correct

22. In the determination of molar mass of A+B- using a colligative property, what may be the value ofvan't Hoff factor if the solute is 50% dissociates?

(a)

0.5

(b)

1.5

(c)

2.5

(d)

1

23. CaO and NaCl have the same crystal structure and approximately the same radii. It U is the lattice energy of NaCl, the approximate lattice energy of CaO is

(a)

U

(b)

2U

(c)

U/2

(d)

4U

24. Pick out the molecule having double bond.

(a)

O2

(b)

N2

(c)

He2

(d)

H2

25. Photo chemical smog formed in congested metropolitan cities mainly consists of

(a)

Ozone, SO2 and hydrocarbons

(b)

Ozone, PAN and NO2

(c)

PAN, smoke and SO2

(d)

Hydrocarbons, SO2 and CO2