12th Class Chemistry The Solid State / ठोस प्रावस्था Question Bank

done Assertion And Reason (MCQs) - Solid State Total Questions - 16

• question_answer1)

  Direction (1 - 16): In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices:

  Assertion: The total number of atoms present in a simple cubic unit cell is one.

  Reason: Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer2)

  Assertion: In Frenkel defect, density of a solid remains unchanged.

  Reason: Ions shift from lattice sites to intersitial sites in Frenkel defect.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer3)

  Assertion: Graphite is a good conductor of electricity, however diamond belongs to the cateogry of insulators.

  Reason: Graphite is soft in nature while diamond is very hard and brittle.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer4)

  Assertion: Total number of octahedral voids present in unit cell of cubic close packing, including the one that is present at the body centre, is four.

  Reason: Besides the body centre, there is one octahedral void present at the centre of each of the six faces of the unit cell and is shared between two adjacent unit cells.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer5)

  Assertion: The packing efficiency is maximum for the fcc structure.

  Reason: The coordination number is 12 in/cc structure.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer6)

  Assertion: Schottky defect is generally shown by the compounds with high co-ordination number.

  Reason: In Schottky defect, equal number of anions and cations are missing from the lattice sites.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer7)

  Assertion: Crystalline solids are anisotropic.

  Reason: Crystalline solids are not as closely packed as ionic solids.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer8)

  Assertion: Zinc blende and Wurtzite have both/cc arrangement of \[{{S}^{2-}}\] ions.

  Reason: A unit cell of zinc blende has 4 formula units while that of Wurtzite has 6 formula units.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer9)

  Assertion: The presence of a large number of Schottky defects lowers the density of NaCI crystals.

  Reason: In NaCI, there are approximately 106 Schottky pairs per \[c{{m}^{3}}\] at room temperature.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer10)

  Assertion: Covalent crystals have generally very high melting points.

  Reason: Covalent bonds are stronger than the ionic bonds.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer11)

  Assertion: On heating, ferromagnetic or ferrimagnetic substances become paramagnetic.

  Reason: The electrons change their spins on heating.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer12)
   

  Assertion: Electrical conductivity of semi-conductors increases with increasing temperature.

  Reason: With the increase in temperature, large number of electrons from valence band can jump to the conduction band.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer13)

  Assertion: Group-13 doped crystals of silicon are called p-type semi-conductors.

  Reason: Holes (positive in charge) are responsible for the semi-conducting properties.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer14)

  Assertion: Band gap in germanium is small.

  Reason: The energy spread of each germanium atomic energy level is infinitesimally small.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer15)

  Assertion: Metals are generally good conductors of electricity.

  Reason: Electrical conductivity of metals is due to Schottky type of defects.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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• question_answer16)

  Assertion: Increase in dielectric constant is observed for crystals having Frenkel defect.

  Reason: Similarly charged cations come closer in the crystal lattice.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement.  done clear
  D)
  Assertion is wrong statement but reason is correct statement.  done clear
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