Question Pool The Solid State
The Solid State - SAMAGRA Question Pool & Answers | Class 12
Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Chemistry The Solid State
Which of the following is anisotropic, Glass or Diamond? Give reason?
-
Answer)
Diamond.
Some of their physical properties such as electrical resistance , refractive index etc show different values when measured along different
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The fourteen possible space lattices corresponding to seven different crystal
systems are called ----------------
-
Answer)
Bravais lattices.
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(a) Which magnetic property of CrO2 is made used in the making of
magnetic tapes? Explain.
(b) Give two examples for diamagnetic substances ?
-
Answer)
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Explain different types of centred unit cells of space lattices of crystalline solids.
-
Answer)
Body centred unit cells, Face centred unit cells, End centred unit cells.
In a body centred unit cell, a particle or lattice point is present at the centre
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A compound is formed by two elements P and Q. Atoms of element Q make CCP and those of P occupy all the octahedral voids . What is the formula of the compound?
-
Answer)
PQ
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What is meant by F - centre? Explain with an example?
-
Answer)
Electron entrapped at an anion vacancy of a crystal with cation excess defect due to anion vacancy is known as F - centre. Sodium chloride when heated in presence of
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Diffrentiate schottky defect from frenkel defect?
-
Answer)
Schottky defect: it is a vacancy defect. Equal number of cations and anions are missing.Density of crystal decreases.
Frenkel defect:Its an interstitial
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Calculate the number of particles present in (1) BCC arrangement of atoms
(ii) FCC arrangement of atoms
-
Answer)
1) FOUR( 8 X 1/8 + 6 X 1/2)
2) TWO ( 8X 1/8 +
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Crystalline solids are anisotropic. Explain
-
Answer)
In crystals the values of certain physical properties like refractive index are different along different directions.i.e., crystals are
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Identify the nature of binding forces present in the following molecular solids and classify them into different types:Solid I2, Solid CO2, Solid HCl, Ice
-
Answer)
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Qn 11.ZnO on heating gradually converts into pale yellow in
colour. Give reason?
-
Answer)
Zinc oxide is white in colour at room temperature. On heating it loses
oxygen as below:
ZnO
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Qn 12.Iron (II) oxide crystalline in cubic structure with unit cell edge 5.0 Ao. If the density of the oxide is 3.8 g cm-3. Calculate the number of Fe2+ and O2- present in each unit cell. [atomic mass of Fe = 56, O = 16]
-
Answer)
Density d = ZM/Noa3
Density d = 3.8 g cm-3
Edge length a = 5.0 A0 = 5X10-8
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Qn 13.(a) How are solids classified on the basis of electrical conductivity?
(b) How will you explain such classification based on energy bands?
-
Answer)
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Qn 14.Identify the following crystal systems and write the unitcell dimensions ?
-
Answer)
(a) Orthorhombic, [ a ≠ b ≠ c ] [α = β = γ = 900 ]
(b) Triclinic[ a ≠ b ≠ c ] [α ≠ β ≠ γ ≠
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Qn 15.Atoms of element ‘B’ form FCC lattice and those of the element ‘A’ occupy
2/3rd of tetrahedral voids. What is the formula of the compound formed
by the elements A and B?
-
Answer)
The number of tetrahedral voids formed is equal to twice the number of atoms of element B and only 2/3rd of these are occupied by the atoms
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Qn 16.If NaCl is doped with 10–3 mol % of SrCl2, what is the concentration of
cation vacancies?
-
Answer)
100 moles NaCl are dopped with 10–3 moles of SrCl2
1mole of NaCl is dopped
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Qn 17.FeO is nonstoichiometric and has the approximate composition Fe0.95O.
Give reason?
-
Answer)
It is because of metal deficiency defect that arises due to cation vacancies. In the crystal of FeO, cation vacancies arises due to the missing of some Fe
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Qn 18.What type of extrinsic semiconductor is formed by dopping Si with Ga?
-
Answer)
p- type semiconductor.
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Qn 19.Give the dimensions and identify the unit cell formed by joining two separate
cubes along their faces?
-
Answer)
a = b ≠ c ; α = β =γ =
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Qn 20.Identify the type of point defect that may occur when molten NaCl containing a small amount of SrCl2 is crystallised by cooling.
-
Answer)
Impurity defect
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