States Of Matter CBSE Questions & Answers

States Of Matter

This is Chemistry Class 11 States of Matter CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The drain cleaner, Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen. What volume of dihydrogen at \({\text{2}}0{\text{ }}^\circ {\text{C}}\) and one bar will be released when 0.15g of aluminum reacts?
  • A
    202.5 mL
    Correct
  • B
    108.2 mL
  • C
    302.5 mL
  • D
    252.5 mL
2
What will be the pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a 9 \({\text{d}}{{\text{m}}^{\text{3}}}\) flask at \({\text{27 }}^\circ {\text{C}}\)?
  • A
    \({\text{9}}.{\text{313 }} \times {\text{ 1}}{0^{\text{4}}}\) Pa
  • B
    \({\text{8}}.{\text{314 }} \times {\text{ 1}}{0^{\text{4}}}\) Pa
    Correct
  • C
    \({\text{7}}.{\text{452 }} \times {\text{ 1}}{0^{\text{4}}}\) Pa
  • D
    \({\text{6}}.{\text{224 }} \times {\text{ 1}}{0^{\text{4}}}\) Pa
3
What will be the pressure of the gaseous mixture when 0.5 L of \({{\text{H}}_{\text{2}}}\) at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at\({\text{27}}^\circ {\text{C}}\) ?
  • A
    1.8 bar
    Correct
  • B
    2.6 bar
  • C
    3.7 bar
  • D
    0.8 bar
4
Density of a gas is found to be 5.46 \({\text{g}}/{\text{d}}{{\text{m}}^{\text{3}}}\) at 27 \(^\circ {\text{C}}\) at 2 bar pressure. What will be its density at STP?
  • A
    \({\text{4g}}/{\text{d}}{{\text{m}}^{\text{3}}}\)
  • B
    \({\text{5g}}/{\text{d}}{{\text{m}}^{\text{3}}}\)
  • C
    \({\text{2g}}/{\text{d}}{{\text{m}}^{\text{3}}}\)
  • D
    \({\text{3g}}/{\text{d}}{{\text{m}}^{\text{3}}}\)
    Correct
5
34.05 mL of phosphorus vapour weighs 0.0625 g at 546 \(^\circ {\text{C}}\) and 0.1 bar pressure. What is the molar mass of phosphorus?
  • A
    1247.7 g
    Correct
  • B
    1325.9 g
  • C
    1097.6 g
  • D
    1120.3 g
6
A student forgot to add the reaction mixture to the round bottomed flask at 27 \(^\circ {\text{C}}\) but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 \(^\circ {\text{C}}\). What fraction of air would have been expelled out?
  • A
    2/ 3
  • B
    1/ 2
  • C
    41338.0
    Correct
  • D
    3/ 7
7
Calculate the temperature of 4.0 mol of a gas occupying 5 \({\text{d}}{{\text{m}}^{\text{3}}}\)at 3.32 bar. (R = 0.083 bar \({\text{d}}{{\text{m}}^{\text{3}}}{{\text{K}}^{ - {\text{1}}}}{\text{mo}}{{\text{l}}^{ - {\text{1}}}}\)).
  • A
    50 K
    Correct
  • B
    150 K
  • C
    70 K
  • D
    310 K
8
Calculate the total number of electrons present in 1.4 g of dinitrogen gas.
  • A
    \({\text{4}}.{\text{2154 }} \times {\text{ 1}}{0^{{\text{23}}}}\) electrons
    Correct
  • B
    \({\text{4}}.{\text{4521 }} \times {\text{ 1}}{0^{{\text{23}}}}\) electrons
  • C
    \({\text{5}}.0{\text{832 }} \times {\text{ 1}}{0^{{\text{23}}}}\) electrons
  • D
    \({\text{4}}.{\text{6329 }} \times {\text{ 1}}{0^{{\text{23}}}}\) electrons
9
The van der Waals Equation adjusts the measured volume
  • A
    down by adding a factor from the entire container volume that accounts for the molecular volume
  • B
    up by subtracting a factor from the entire container volume that accounts for the molecular volume
  • C
    down by subtracting a factor from the entire container volume that accounts for the molecular volume
    Correct
  • D
    up by subtracting a factor from the entire container volume that accounts for the container volume
10
The van der Waals Equation adjusts the measured pressure
  • A
    up by subtracting a factor that accounts for intermolecular attractions
  • B
    down by adding a factor that accounts for intermolecular attractions
  • C
    up by adding a factor that accounts for intramolecular attractions
  • D
    up by adding a factor that accounts for intermolecular attractions
    Correct
11
Pay load is defined as the difference between the mass of displaced air and the mass of the balloon. Calculate the pay load when a balloon of radius 10 m, mass 100 kg is filled with helium at 1.66 bar at\({\text{27}}^\circ {\text{C}}\). (Density of air = 1.2 kg m-3 and R = 0.083 bar \({\text{d}}{{\text{m}}^{\text{3}}}{{\text{K}}^{ - {\text{1}}}}{\text{mo}}{{\text{l}}^{ - {\text{1}}}}\).
  • A
    3811.1 kg
    Correct
  • B
    3905.3 kg
  • C
    3345.2 kg
  • D
    3568.2 kg
12
Calculate the volume occupied by 8.8 g of CO2 at 31.1\(^\circ {\text{C}}\) and 1 bar pressure. R = 0.083 bar \({\text{d}}{{\text{m}}^{\text{3}}}{{\text{K}}^{ - {\text{1}}}}{\text{mo}}{{\text{l}}^{ - {\text{1}}}}\).
  • A
    4.25 L
  • B
    6.35 L
  • C
    3.03 L
  • D
    5.05 L
    Correct
13
2.9 g of a gas at 95 \(^\circ {\text{C}}\) occupied the same volume as 0.184 g of dihydrogen at 17 \(^\circ {\text{C}}\), at the same pressure. What is the molar mass of the gas?
  • A
    50 g \({\text{mo}}{{\text{l}}^{ - {\text{1}}}}\)
  • B
    40 g \({\text{mo}}{{\text{l}}^{ - {\text{1}}}}\)
    Correct
  • C
    43 g \({\text{mo}}{{\text{l}}^{ - {\text{1}}}}\)
  • D
    46 g \({\text{mo}}{{\text{l}}^{ - {\text{1}}}}\)
14
A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.
  • A
    0.8 bar
    Correct
  • B
    1.12 bar
  • C
    0.97 bar
  • D
    0.65 bar
15
The vapor pressure of different substances at the same temperature increases if
  • A
    the intermolecular forces of the substance are strong
  • B
    the molecules of the substance are covalent bonded
  • C
    the intermolecular forces of the substance are weak
    Correct
  • D
    the molecules of the substance are ionic bonded