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

Which of the following figures does not represent 1 mole of dioxygen gas at STP?

A
16 grams of gas
Correct
B
\({\text{6}}.0{\text{22 }} \times {\text{ 1}}{0^{{\text{23}}}}\)dioxygen molecules
C
22.7 liters of gas
D
32 grams of gas

under which of the following two conditions, a gas deviates most from the ideal behavior?

A
Low temperature only
B
High temperature and Low pressure
C
High pressure and Low temperature
Correct
D
Low pressure only

Which of the following changes decrease the vapour pressure of water kept in a sealed vessel?

A
Decreasing the quantity of water
B
Adding salt to water
Correct
C
Decreasing the volume of the vessel to one-half
D
increasing the temperature of water

Heat of vaporization is always larger than the Heat of fusion because

A
it takes less energy to separate particles completely than just to free them from their fixed positions in the solid
B
it takes no energy to separate particles completely than just to free them from their oscillating positions in the solid
C
it takes more energy to separate particles completely than just to free them from their random positions in the solid
D
it takes more energy to separate particles completely than just to free them from their fixed positions in the solid
Correct

The fraction of molecules with enough energy to escape the liquid

A
is greater at the higher temperature
Correct
B
is independent of temperature
C
is lesser at the higher temperature
D
is greater at the lower temperature

The ease with which the electron cloud of a particle can be distorted is called its

A
negativity
B
cloud strength
C
polarizability
Correct
D
polarity

Molecules in the interior of liquid experience intermolecular

A
attractions in all directions
Correct
B
repulsion in all directions
C
repulsion away from surface only
D
attractions towards surface only

Surface tension results because

A
a liquid tends to maximize the number of molecules at the surface
B
a liquid tends to increase the number of molecules at the surface
C
a liquid tends to minimize the number of molecules at the surface
Correct
D
surface molecules have different properties

Capillarity results from a competition between the

A
intermolecular forces within tubewall and intramolecular forces within tubewall
B
intramolecular forces within the liquid (cohesive forces) and those between the liquid and the tube walls (adhesive forces)
C
intermolecular forces within the liquid (cohesive forces) and those between the liquid and the tube walls (adhesive forces)
Correct
D
intermolecular forces within liquid and intramolecular forces within liquid

The van der Waals Equation adjusts the measured pressure

A
up by adding a factor that accounts for intermolecular attractions
Correct
B
up by subtracting a factor that accounts for intermolecular attractions
C
up by adding a factor that accounts for intramolecular attractions
D
down by adding a factor that accounts for intermolecular attractions

The van der Waals Equation adjusts the measured volume

A
up by subtracting a factor from the entire container volume that accounts for the molecular volume
B
down by adding 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

Acetylene\(\left( {{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}} \right)\), an important fuel in welding, is produced in the laboratory when calcium carbide \(\left( {{\text{Ca}}{{\text{C}}_{\text{2}}}} \right)\) reacts with water: \({\text{Ca}}{{\text{C}}_{\text{2}}}\left( {\text{s}} \right){\text{ }} + {\text{ 2}}{{\text{H}}_{\text{2}}}0\left( {\text{l}} \right){\text{ }} \to {\text{ }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\left( {\text{g}} \right){\text{ }} + {\text{ Ca}}{\left( {{\text{OH}}} \right)_{\text{2}}}\left( {{\text{aq}}} \right)\) For a sample of acetylene collected over water, total gas pressure (adjusted to barometric pressure) is 738 torr and the volume is 523 mL. At the temperature of the gas\(\left( {{\text{23}}^\circ {\text{C}}} \right)\), the vapor pressure of water is 2 1 torr. How many grams of acetylene are collected?

A
\(0.{\text{832 g }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\)
B
\(0.{\text{763 g }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\)
C
\(0.{\text{529 g }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\)
Correct
D
\({\text{1}}.{\text{236 g }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\)

A scale model of a blimp rises when it is filled with helium to a volume of 55.0 \({\text{d}}{{\text{m}}^{\text{3}}}\). When 1.10 mol of He is added to the blimp, the volume is 26.2 \({\text{d}}{{\text{m}}^{\text{3}}}\). How many more grams of He must be added to make it rise? Assume constant T and P.

A
5.21 g He
B
3.98 g He
C
4.26 g He
D
4.84 g He
Correct

Hot \({{\text{H}}_{\text{2}}}\)can reduce copper(II) oxide, forming the pure metal and \({{\text{H}}_{\text{2}}}{\text{O}}\). What volume of \({{\text{H}}_{\text{2}}}\)at 765 torr and 225\(^\circ {\text{C}}\) is needed to reduce 35.5 g of copper(II) oxide?

A
18.1 L
Correct
B
22.3 L
C
13.1 L
D
15.7 L

What mass of potassium chloride forms when 5.25 L of chlorine gas at 0.950 atm and 293 K reacts with 17.0 g of potassium?

A
41.5 g KCl
B
30.9 g KCl
Correct
C
23.3 g KCl
D
35.7 g KCl