JEE Questions for Chemistry The Solid State Quiz 5 - MCQExams.com

Point out the correct statement

  • Chemistry-The Solid State-8579.png
  • Interfacial angles in crystals are measured by goniometer
  • Schottky defect is a stoichiometric defect
  • All the above
Germanium is an example of
  • An intrinsic semiconductor
  • An n- type semiconductor
  • A p- type semiconductor
  • Insulator
Of the five ΔH values required to calculate a lattice energy using the Born-Haber cycle, the one that is most difficult to measure is
  • The electron affinity of the non-metal
  • The heat of formation of gaseous atoms of the non-metal
  • The ionisation energy of the metal
  • The heat of sublimation of metal
The total number of three fold axes of symmetry in ccp arrangement is
  • 6
  • 4
  • 2
  • 1
Pressure cooker reduces cooking time because
  • the heat is more easily distributed
  • the higher pressure tenderizes the food
  • the boiling point of the water inside is elevated
  • a large flame is used
The number of atoms contained in a fcc unit cell of a monoatomic substance is
  • 1
  • 2
  • 4
  • 6
Most crystals show good cleavage because their atom, ions or molecules are
  • weakly bonded together
  • strongly bonded together
  • spherically symmetrical
  • arranged in planes
The three states of matter are solid, liquid and gas. Which of the following statements is true about them ?
  • Gases and liquids have viscosity as a common property
  • The molecules in all the three states possess random translational motion
  • Gases cannot be converted into solids without passing through the liquid phase
  • Solids and liquids have pressure as a common property
In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is
  • Interstitial defect
  • Vacancy defect
  • Frenkel defect
  • Schottky defect
A closed flask contains water in all its three states solid, liquid and vapour at OºC. In this situation, the average kinetic energy of water molecules will be
  • the greatest in all the three states
  • the greatest in vapour state
  • the greatest in the liquid state
  • the greatest in the solid state
In the fluorite structure, the coordination number of Ca2+ ion is
  • 4
  • 6
  • 8
  • 3
On doping Ge metal with a little of In or Ga, one gets
  • p- type semi conductor
  • n-type semi conductor
  • insulator
  • rectifier
The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming.
  • Allotropic crystals
  • Liquid crystals
  • Isomeric crystals
  • Isomorphous crystals
The existence of a substance in more than one solid modification is known as
  • Isomorphism
  • Polymorphism
  • Amorphism
  • Allotropy
A liquid can exist only:
  • between triple point and critical temperature
  • at any temperature above the melting point
  • between melting point and critical temperature
  • between boiling and melting temperature
For a covalent solid, the units which occupy lattice points are :
  • atoms
  • ions
  • molecules
  • electrons
When electrons are trapped into the crystal in anion vacancy, the defect is known as :
  • Schottky defect
  • Frenkel defect
  • Stoichiometric defect
  • F-centres
In the laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine. The salt obtained is yellow in colour. The cause of yellow colour is
  • Presence of Na+ ions in the crystal lattice
  • Presence of Cl- ions in the crystal lattice
  • Presence of electrons in the crystal lattice
  • Presence of face centred cubic crystal lattice
If one end of a piece of a metal is heated the other end becomes hot after some time. This is due to
  • Energised electrons moving to the other part of the metal
  • resistance of the metal
  • mobility of atoms in the metal
  • minor perturbation in the energy of atoms
If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur ?
  • p -Type
  • n – Type
  • both (and (2)
  • none of the two
A metallic crystal crystallises into a lattice containing a sequence of layers AB AB AB …..Any packing of spheres leaves out voids in the lattice. What percentage of volume of this lattice is empty space ?
  • 74%
  • 26%
  • 50%
  • none of these
A solid has a structure in which W atoms are located at the corners of a cubic lattice, O atoms at the centre of edges and Na atom at centre of the cube. The formula for the compound is
  • NaWO2
  • NaWO3
  • Na2WO3
  • NaWO4
The critical temperature of water is higher than that of O2 because the H2O molecule has
  • fewer electrons than O2
  • two covalent bonds
  • V- shape
  • dipole moment
The co-ordination number of a metal crystallising in a hexagonal close packed structure is
  • 12
  • 4
  • 8
  • 6
The packing fraction for a body-centred cubic is
  • 0.42
  • 0.53
  • 0.68
  • 0.82
The range of radius ratio (cationic to anionic) for an octahedral arrangement of ions in an ionic solid is
  • 0 ‒ 0.155
  • 0.155 ‒ 0.225
  • 0.225 ‒ 0.414
  • 0.414 ‒ 0.732
When molten zinc is cooled to solid state, it assumes HCP structure. Then the number of nearest neighbours of zinc atom will be
  • 4
  • 6
  • 8
  • 12
When the temperature is increased, surface tension of water
  • increases
  • decreases
  • remains constant
  • shows irregular behaviour
Co-ordination number of Na+ in NaCl is
  • 4
  • 3
  • 6
  • 5
When the temperature is raised, the viscosity of the liquid decreases. This is because
  • decreased volume of the solution
  • increase in temperature increases the average kinetic energy of molecules which over comes the attractive force between them
  • decreased covalent and hydrogen bond forces
  • increased attraction between molecules
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