Question

15.
In a face centred cubic lattice atoms A are at the corner points and atoms B at the face centred points.
If atom B is missing from one of the face centred points, the formula of the ionic compound is :
[AIEEE-2011, Jee-Main (online)-14]
(2) A2B3
(1) AB2
(3) A:B2
SS0127
(4) AB
2017
=​

Answer 1

Explanation:

Number of atoms of

′

A

′

=8×

8

1

=1

Number of atoms of

′

B

′

=5×

2

1

=

2

5

A:B=1:

2

5

=2:5

Answer 2

Answer:

A2B5

Explanation:

Number of atoms of ′A′=8×81=1

Number of atoms of ′B′=5×21=25

A:B=1:25=2:5

Formula of the solid =A2B5