Solid State Test

Result

Solid State Test - 73

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Weekly Quiz Competition

Question 1
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Density of Nickel ($$M=59$$) metal is $$8.9\ g/cc$$ and it is known to crystallize in cubic unit cell. If edge length of the unit cell is $$3.5\ \mathring { A } $$, atomic radius of the metal is?

A
$$1.25\ \mathring { A } $$

B
$$12.5\ \mathring { A } $$

C
$$6.25\ \mathring { A } $$

D
$$25\ \mathring { A } $$

Solution
Question 2
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Tungsten ($$M=184$$) crystallises in cubic lattice structures and its density is $$19.26\ g/cc$$. If edge length of the unit cell is $$3.165\ \mathring { A } $$, the type of unit cell is?

A
simple cubic

B
BCC

C
FCC

D
edge-centred cubic lattice

Solution
Question 3
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A certain ionic compound is formed in the Spinel structure in nature in which $${O^{2 - }}$$ ionic constitute CCP lattice $${A^{2 + }}$$ ions occupy $$1/{8^{th}}$$ of the tetrahedral voids and $$B{^{3 + }}$$ ions occupy $$1/2$$ of the octahedral voids . Find out total +ve charge contained in two-unit cell of given ionic structure.

A
+8 electronic charge

B
+12 electronic charge

C
+16 electronic charge

D
+24 electronic charge

Solution
Question 4
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Packing efficiency of $$NaCl$$ is almost

A
$$72\%$$

B
$$74\%$$

C
$$79\%$$

D
$$75\%$$

Solution
Question 5
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The type of defect in $$NaCl$$ crystal will be -

A
point defect

B
interstitial defect

C
vacancy defect

D
impurity defect

Solution
Question 6
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How many unit cells are present in $$0.1$$ moles of rock salt?

A
$$0.1{N}_{0}$$

B
$$0.25{N}_{0}$$

C
$$0.4{N}_{0}$$

D
$$0.025{N}_{0}$$

Solution
Question 7
1 / -0

In normal spinel structure there is a closed packed array of $${O}^{2-}$$ ions. The trivalent cations are present in:

A
$$75$$% of octahedral voids

B
$$50$$% of octahedral voids

C
$$12.5$$% of tetrahedral voids

D
$$25$$% of octahedral voids

Solution
Question 8
1 / -0

Select the incorrect statement:

A
Atom present at the corner of HCP prism is shared by 6 such prisms

B
HCP is more close packing than FCC

C
Size of the octahedral void is bigger than tetrahedral void

D
If $$ \cfrac { r _ { + } } { r _ { - } } = 0.5 $$, then most probable co-ordination number of cation will be 6.
Question 9
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Among the following, the compound with high lattice energy is

A
NaCl

B
$${\text{MgC}}{{\text{l}}_{\text{2}}}$$

C
KCl

D
CsF

Solution
Question 10
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Which pair is correct order of lattice energy?

A
KCl > MgO

B
AIN > MgO

C
CaO > BaO

D
$${\text{MgC}}{{\text{O}}_{\text{3}}} > {\text{CaC}}{{\text{O}}_{\text{3}}}$$

Solution