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JEE Main 2021 (Online) 17th March Evening Shift
Numerical  +4  -1
KBr is doped with 10$$-$$5 mole percent of SrBr2. The number of cationic vacancies in 1g of KBr crystal is ____________ 1014. (Round off to the Nearest Integer).

[Atomic Mass : K : 39.1 u, Br : 79.9 u NA = 6.023 $$\times$$ 1023]
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2
JEE Main 2021 (Online) 16th March Evening Shift
Numerical  +4  -1
Ga (atomic mass 70 u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is __________ $$\times$$ 1021. (Round off to the Nearest Integer). [Given : NA = 6.023 $$\times$$ 1023]
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3
JEE Main 2021 (Online) 16th March Morning Shift
Numerical  +4  -1
A certain element crystallises in a bcc lattice of unit cell edge length 27$$\mathop A\limits^o$$. If the same element under the same conditions crystallises in the fcc lattice, the edge length of the unit cel in $$\mathop A\limits^o$$ will be ____________. (Round off to the Nearest Integer).

[Assume each lattice point has a single atom]

[Assume $$\sqrt 3$$ = 1.73, $$\sqrt 2$$ = 1.41]
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4
JEE Main 2021 (Online) 26th February Evening Shift
Numerical  +4  -1
The number of octahedral voids per lattice site in a lattice is _________. (Rounded off to the nearest integer)
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