1
MCQ (Single Correct Answer)

AIPMT 2000

Cation and anion combines in a crystal to form following type of compound
A
ionic
B
metallic
C
covalent
D
dipole-dipole.

Explanation

We know that electrostatic force is that binds the oppositely charged ions which are formed by transfer of electron from one atom to another is called ionic bond. We also know that cation and anion are oppositely charged particles therefore they form ionic bond in crystal.
2
MCQ (Single Correct Answer)

AIPMT 2000

In cube of any crystal A-atom placed at every corners and B-atom placed at every centre of face. The formula of compound is
A
AB
B
AB3
C
A2B2
D
A2B3

Explanation

A atoms are at 8 corners of the cube

$$ \therefore $$ No. of A atoms per unit cell = 8 $$ \times $$ $${1 \over 8}$$ = 1

B atoms are at the face centre of six faces.

$$ \therefore $$ No. of B atoms per unit cell = 6 $$ \times $$ $${1 \over 2}$$ = 3

Thus, formula of compound = AB3

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