Worksheets Class 11 Chemistry States of Matter

Students should refer to Worksheets Class 11 Chemistry States of Matter Chapter 5 provided below with important questions and answers. These important questions with solutions for Chapter 5 States of Matter have been prepared by expert teachers for Class 11 Chemistry based on the expected pattern of questions in the class 11 exams. We have provided Worksheets for Class 11 Chemistry for all chapters on our website. You should carefully learn all the important examinations questions provided below as they will help you to get better marks in your class tests and exams.

States of Matter Worksheets Class 11 Chemistry

Question. When did substances exist in different crystalline forms the phenomenon is called :
(a) Allotropy
(b) Polymorphism
(c) Polymerization
(d) Isomorphism  

Question. Equal masses of ethane and hydrogen are mixed in an empty container at 25°C . The fraction of total pressure exerted by hydrogen is
(a) 1 : 2
(b) 1 : 1
(c) 01 : 16
(d) 15 : 16 

Question. When did substances exist in different crystalline forms the phenomenon is called :
(a) Allotropy
(b) Polymorphism
(c) Polymerization
(d) Isomorphism

Question. Cooling is caused by :
(a) Evaporation
(b) Convection
(c) Conduction
(d) none of the above  

Question. If the pressure of a gas is increased then its mean free path becomes:
(a) 0
(b) Less
(c) More
(d) Infinity 

Question. According to kinetic theory of gases,in an ideal gas,between two successive collisions a gas molecule travels
(a) In a circular path
(b) In a wavy path
(c) In a straight line path
(d) With an accelerated velocity

Question. The volume of 2.8 g of carbon monoxide at 27°C and 0.0821 atm is
(a) 30 L
(b) 3 L
(c) 0.3 L
(d) 1.5 L 

Question. Standard conditions are :
(a) 0°C and 14. 7mm
(b) 32°F and 76 cm
(c) 273°C and 760 mm
(d) 4°C and 76 m  

Question. 1 atmosphere is equal to:
(a) 1 torr
(b) 760 cm
(c) 760 mm
(d) 76 torr  

Question. The rates of diffusion of gases are inversely proportional to square root of their densities . This statement refers to :
(a) Daltons Law
(b) Grahams Law
(c) Avogadros Law
(d) None of the Above  

Question. A gas cylinder can withstand a pressure of 15 atm. The pressure of cylinder is measured 12  atm at 27°C. Upto which temperature limit the cylinder will not burst?
(a) 375°C
(b) 102°C
(c) 33.75°C
(d) 240°C

Question. Which of the following plots is not according to Boyle’s law?

Question. For the type of interactions;
(I) covalent bond,
(II) van der Waals forces,
(III) hydrogen bonding,
(IV) dipole-dipole interaction, which represents the correct order of increasing stability?
(a) (I) < (III) < (II) < (IV)
(b) (II) < (III) < (IV) < (I)
(c) (II) < (IV) < (III) < (I)
(d) (IV) < (II) < (III) < (I)

Question. If P, V and T represent pressure, volume and temperature of the gas, the correct representation of Boyle’s law is
(a) V ∝ 1/P (P is constant) 
(b) PV = RT
(c) V ∝ 1/P (at constant T)
(d) PV = nRT

Question. Maximum deviation from ideal gas is expected from
(a) CH₄(g)
(b) NH₃(g)
(c) H₂(g)
(d) N₂(g)

Question. Use of hot air balloons in sports and meteorological observations is an application of
(a) Boyle’s law
(b) Newton’s law
(c) Kelvin’s law
(d) Charles’ law.

Question. A gas such as carbon monoxide would be most likely to obey the ideal gas law at
(a) low temperatures and high pressures
(b) high temperatures and high pressures
(c) low temperatures and low pressures
(d) high temperatures and low pressures.

Question. Which of the following is true about gaseous state?
(a) Thermal energy = molecular attraction
(b) Thermal energy >> molecular attraction
(c) Thermal energy << molecular attraction
(d) Molecular forces >> those in liquids

Case Based MCQs :

Intermolecular forces are the forces of attraction and repulsion that exist between molecules of a compound. These cause the compound to exist in a certain state of matter – solid, liquid or gas and affect the melting and boiling points of compounds as well as the solubilities of one substance in another. Attractive intermolecular forces are also called van der Waals’ forces. These are weak forces.

Question. The nature of inter-particle forces in benzene is
(a) dipole-dipole interaction
(b) dispersion force
(c) ion-dipole interaction
(d) H-bonding.

Question. In which of the following molecules, the van der Waals forces are likely to be the most  important in determining the m.pt. and b.pt?
(a) CO
(b) H₂S
(c) Br₂
(d) HCl

Question. Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is
(a) more than unit electronic charge
(b) equal to unit electronic charge
(c) less than unit electronic charge
(d) double the unit electronic charge.

Question. The interaction energy between two temporary dipoles is proportional to (where r is the distance between the two particles)
(a) 1/r⁴
(b) 1/r²
(c) 1/r⁵
(d) 1/r⁶

Question. Attractive intermolecular forces known as van der Waals forces do not include which of the following types of interactions?
(a) London forces
(b) Dipole-dipole forces
(c) Ion-dipole forces
(d) Dipole-induced dipole forces

If a hydrogen atom is bonded to a highly electronegative element such as fluorine, oxygen, nitrogen, then the shared pair of electrons lies more towards the electronegative element. This leads to a polarity in the bond in such a way that a slight positive charge gets developed on H-atom, viz,
H^δ+ : Oδ^– H^δ+ : F^δ– H^δ+ : N^δ–
Such a bond between the hydrogen atom of one molecule and the more electronegative atom of the same or another molecule is called hydrogen bond.

Question. Which of the following statements is not true?
(a) Intermolecular hydrogen bonds are formed between two different molecules of compounds.
(b) Intramolecular hydrogen bonds are formed between two different molecules of the same compound.
(c) Intramolecular hydrogen bonds are formed within the same molecule.
(d) Hydrogen bonds have strong influence on the physical properties of a compound.

Question. Unusual high b.p. of water is result of
(a) intermolecular hydrogen bonding
(b) intramolecular hydrogen bonding
(c) both intra and intermolecular hydrogen bonding
(d) high specific heat.

Question. Boiling point of hydrogen fluoride is highest amongst HF, HCl, HBr and HI. Which type of intermolecular forces are present in hydrogen fluoride?
(a) H—F has highest van der Waals forces and dipole moment.
(b) H—F has highest London forces.
(c) H—F has highest dipole moment hence has dipole-dipole, London forces and hydrogen bonding.
(d) H—F has strong intermolecular interactions like dipole-induced dipole.

Question. Which of the following compounds can form hydrogen bond?
(a) CH₄
(b) H₂O
(c) NaCl
(d) CHCl₃

Question. The boiling point is not affected due to hydrogen bonding in
(a) water
(b) ammonia
(c) methyl alcohol
(d) hydrogen chloride.

An ideal gas is a gas to which the laws of Boyle and Charles are strictly applicable under all conditions of temperatures and pressures. 

Ideal gas equation is a relation between four variables and it describes the state of any gas. For this reason, it is also called equation of state.

Question. If P is the pressure and r is the density of a gas, then P and r are related as
(a) P ∝ p
(b) P ∝ p²
(c) P ∝ 1/p
(d) P ∝ 1/p²

Question. I, II, III are three isotherms respectively at T₁, T₂ and T₃. Temperature will be in order

Question. 7.0 g of a gas at 300 K and 1 atm occupies a volume of 4.1 litre. What is the molecular mass of the gas?
(a) 42
(b) 38.24
(c) 14.5
(d) 46.5

Question. If volume of 2 moles of an ideal gas at 540 K is 44.8 litre, then its pressure will be
(a) 1 atm
(b) 3 atm
(c) 2 atm
(d) 4 atm

Question. At 25°C and 730 mm pressure, 380 mL of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occupy at 760 mm pressure?
(a) 365 mL
(b) 449 mL
(c) 569 mL
(d) 621 mL

Real gases do not obey ideal gas equation under all conditions. They nearly obey ideal gas equation at higher temperatures and very low pressures. However, they show deviations from ideality at low temperatures and high pressures.
The isotherms obtained by plotting pressure, P against volume, V for real gases do not coincide with that of ideal gas, as shown :

The deviation from ideal gas behaviour can also be expressed by compressibility factor, Z.

Question. The units of van der Waals’ constants a and b respectively are
(a) L atm² mol^–1 and mol L^–1
(b) L atm mol² and mol L
(c) L² atm mol^–2 and mol^–1 L
(d) L^–2 atm^–1 mol^–1 and L mol^–2

Question. The correction factor ‘b’ to the ideal gas equation corresponds to
(a) density of the gas molecules
(b) excluded volume or covolume
(c) electric field present between the gas molecules
(d) forces of attraction between the gas molecules.

Question. The gas equation PV = nZRT becomes ideal gas equation when
(a) Z = 0
(b) Z = 0.5
(c) Z = 1
(d) Z = 2