#### 11th Standard Chemistry Gaseous State 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. Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

(a)

at high pressure the collision between the gas molecule become enormous

(b)

at high pressure the gas molecules move only in one direction

(c)

at high pressure, the volume of gas become insignificant

(d)

at high pressure the intermolecular interactions become significant

2. A bottle of ammonia and a bottle of HCI connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be

(a)

At the center of the tube

(b)

Near the hydrogen chloride bottle

(c)

Near the ammonia bottle

(d)

Throughout the length of the tube

3. The table indicates the value of van der Waals constant 'a' in (dm3)2 atm. mol-2.

 Gas O2 N2 NH3 CH4 a 1.360 1.390 4.170 2.253

The gas which can be most easily liquefied is

(a)

O2

(b)

N2

(c)

NH3

(d)

CH4

4. Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are Vander Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases the most easily liquefiable one is

(a)

P

(b)

Q

(c)

R

(d)

S

5. The units of Vander Waals constants 'b' and 'a' respectively

(a)

mol L-1 and L atm2 mol-1

(b)

mol L and L atm mol2

(c)

mol-1L and L2 atm mol-2

(d)

none of these

6. What is the density of N2 gas at 227o C and 5.00 atm pressure? (R=0.082 L atm K-1 mol-1 )

(a)

1.40 g/L

(b)

2.81 g/L

(c)

3.41 g/L

(d)

0.29 g/L

7. 25g of each of the following gases are taken at 27°C and 600 mm Hg pressure. Which of these will have the least volume?

(a)

HBr

(b)

HCI

(c)

HF

(d)

HI

8. The compressibility factor is given by

(a)

Z=PV

(b)

Z=nRT

(c)

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

(d)

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

9. Statement I: H2 when allowed to expand at room temperature it causes heating effect.
Statement II: H2 has inversion temperature mush below room temperature.

(a)

Both statement I and statement II are true and statement II explains statement I.

(b)

Both statement I and statement II are true but statement II does not explain statement I.

(c)

Statement I is true but statement II is false.

(d)

Both the statements are false

10. The inversion temperature for a gas is given by _______________

(a)

$\frac { 2a }{ Rb }$

(b)

$\frac { a }{ Rb }$

(c)

$\frac { Rb }{ 2a }$

(d)

$\frac { Rb }{ a }$

11. The corrected term for pressure in the vanderwaal's equation of state is _____________

(a)

(V-b)

(b)

$P+\frac { a }{ { V }^{ 2 } }$

(c)

(b-V)

(d)

$\frac { a }{ { V }^{ 2 } } \times P$

12. Maximum deviations from ideal gas is expected from:

(a)

H2(g)

(b)

N2(g)

(c)

CH4(g)

(d)

NH3(g)

13. The scope of the plot between PV and P at constant temperature is

(a)

zero

(b)

1

(c)

$\frac{1}{2}$

(d)

$\frac{1}{\sqrt2}$

14. Which of the following is the correct mathematical relation for Charles' law at constant pressure?

(a)

$V\propto T$

(b)

$V\propto t$

(c)

$V\propto \frac{1}{T}$

(d)

all of above

15. The compressibility factor, z for an ideal gas is ________.

(a)

zero

(b)

less than one

(c)

greater than one

(d)

equal to one

16. Which one of the following is not a monoatomic gas?

(a)

Neon

(b)

Xenon

(c)

Argon

(d)

Oxygen

17. Which of the following is a triatomic gas at room temperature?

(a)

Oxygen

(b)

Helium

(c)

Ozone

(d)

Nitrogen

18. Among the following, which is deadly poison?

(a)

CO2

(b)

HCN

(c)

HCI

(d)

NH3