Solid state

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Solid state

Test1 Max. Marks = 40

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1. In a solid ‘AB’ having the NaCl structure, ‘A’ atoms occupy the corners of the cubic unit cell If all the face centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is :

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(A) AB₂

(B) A₂B

(D) A₃B₄

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2. Fraction of void present in fcc lattice is

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(A) 0.74

(B) 0.68

(D) 0.26

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3. A crystal of Fe₃O₄ is-

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(A) Paramagnetic

(B) Diamagnetic

(D) None of these

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4. In the Schottky defect -

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(A) cations are missing from the lattice sites and occupy the interstitial sites

(B) equal number of cations and anions are missing

(D) equal number of extra cations and electrons are present in the interstitial sites

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5. What is the diameter of the largest sphere that will fit in the void at the centre of the cube edge of a BCC crystal of edge length a ?

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(A) 0.134 a

(B) 0.76 a

(D) 0.098 a

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6. The number of nearest neighbours around each particle in face centred cubic lattice is

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(A) 4

(B) 6

(B) 8

(D) 12

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7. An element (atom mass = 100 g/mol) having BCC structure has unit cell edge 400 pm. The density of the element is -

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(A) 2.144 g cm⁻³

(B) 5.188 g cm⁻³

(D) 10.376 g cm⁻³

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8. Which of the following statements is/are not true ?

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(A) Density of solid gets increased due to interstitial defects

(B) Frenkel defects do not alter the density of the solid

(D) Non-stoichiometric defects do not alter the density of the solid

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9. The tetrahedral voids formed by ccp arrangement of Cl– ions in rock salt structure are

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(A) Occupied by Na+ ions

(B) Occupied by Cl– ions

(D) Vacant

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10. The radius of Ag+ ion is 126 pm while that of
I¯ ion is 216 pm. The co-ordination number of Ag in AgI is –

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(A) 2

(B) 4

(D) 8

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