Test: Gaseous State - 4 | 20 Questions MCQ Test

QUESTION: 1

Maximum number of electrons in a subshell with l = 3 and n = 4 is

A.
10
B.
12
C.
14
D.
16

Solution:

n = 4, l =3

In f subshell, there are 7 orbitals and each orbital can accommodate a maximum of two electrons, so, maximum no. of electrons in 4f subshell = 7×2 = 14

QUESTION: 2

Among the following curves, which is not according to Charle’s law:

Solution:

QUESTION: 3

The electronic configuration of a dipositive metal M²⁺ is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be

A.
56
B.
36
C.
98
D.
30

Solution:

QUESTION: 4

Which in not correct curve for gay-lussac’s law:

Solution:

QUESTION: 5

Which is incorrect curve for Boyle’s law:

Solution:

QUESTION: 6

The energy of an electron in first Bohr orbit of H-atom is –13.6 eV. The possible energy value of electron in the excited state of Li²⁺ is

A.
– 122.4 eV
B.
30.6 eV
C.
-30.6 eV
D.
13.6 eV

Solution:

where

E₁=Energy of first Bohr orbit =−13.6eV

n= no of orbit

Z=Atomic no

For Li²⁺, the excited state, n=2 and Z=3

QUESTION: 7

Which of the following curve does not represent gay lusacc’s law:

Solution:

P = KT
P = K(t^∘C+273)

QUESTION: 8

For the gaseous reaction, the rate is often expressed in terms of dp/dt instead of dC/dt or dn/dt. What is the relationship among these three expression:

A.
B.
C.
D.
None of the above is correct

Solution:

QUESTION: 9

A gas can be liquefied most suitably at:

A.
T = T_c and P < P_c
B.
T < T_c and P> P_c
C.
T < T_c and P = P_c
D.
T > T_c and P > P_c

Solution:

For liquefaction of gas temperature should be lower than critical temperature. Also higher is the P in comparison to critical pressure easier is liquefaction .

QUESTION: 10

For a closed (not rigid) container containing n = 10 moles of an ideal gas fitted with movable, frictionless, weightless piston operating such that pressure of gas remains constant at 0.821 atm, which graph represents correct variation of log V vs log T where V is in litre and T in Kelvin:

Solution:

QUESTION: 11

At a definite temperature (T), the distribution of velocities is given by the curve. The curve that indicates that the velocity corresponding to points A, B and C are:

A.
Most probable, root mean square and average
B.
Average, root mean square and most probable
C.
Root mean square, average and most probable
D.
Most probable, average and root mean square

Solution:

QUESTION: 12

A graph is plotted between P (atm) vs t°C for 10 mol of an ideal gas as follows:

Then slope of curve and volume of container (L) respectively, is

A.
0.1, 8.21
B.
8.21, 0.1
C.
27.3, 8.21
D.
8.21, 27.3

Solution:

QUESTION: 13

For two samples A and B of ideal gas following curve is plotted between n vs V (volume) of container) at 16.42 atm pressure as follows, then temperature of A and B respectively are:

Solution:

QUESTION: 14

Match the Column-I and Column-II:

A.
A-P, B-S, C-R, D-Q
B.
A-R, B-S, C-P, D-Q
C.
A-Q, B-S, C-R, D-P
D.
A-Q, B-S, C-P, D-R

Solution:

Correct Answer :- D

Explanation : A-Q, B-S, C-P, D-R

QUESTION: 15

Match the correct from List-1 to List-2 on the basic of following Andrews isotherm of Real gas

A.
A-QS, B-R, C-PT, D-T
B.
A-PT, B-R, C-QS, D-T
C.
A-QS, B-PT, C-R, D-T
D.
A-R, B-QS, C-T, D-PT

Solution:

Refer to the following diagram and compare

QUESTION: 16

Match the Colum –I and Column-II

Fraction of the gas particles

A.
A-S, B-P, C-S, D-QR
B.
A-P, B-S, C-P, D-QR
C.
A-S, B-QR, C-P, D-S
D.
A-S, B-P, C-QR, D-S

Solution:

QUESTION: 17

Initial temperature of an ideal gas is 75°C. At what temperature, the sample of neon gas would be heated to double its pressure, it the initial volume of gas is reduced by 15%:

A.
60°C
B.
592°C
C.
128°C
D.
319°C

Solution:

QUESTION: 18

At constant volume for a fixed number of moles of a gas, the pressure of the gas increases with the rise in temperature due to

A.
Increases in average molecular speed
B.
Increase in rate of collisions amongst molecules
C.
Increase in molecule attraction
D.
Increase in mean free path

Solution:

QUESTION: 19

Three flasks of equal volumes contain CH₄, CO₂, and Cl₂ gases respectively. They will contain equal number of molecules if:

A.
The mass of all the gases is same
B.
The moles of all the gas is same but temperature is different
C.
Temperature and pressure of all the flasks are same
D.
Temperature, pressure and masses same in the flasks

Solution:

QUESTION: 20

At 0°C and one atm pressure, a gas occupied 100 cc. If the pressure is increased to one and a halftime and temperature is increased by one-third of absolute temperature, then final volume of the gas will be: