Multiple choice

Identify the incorrect statement(s):

  1. Pentaborane-11shows symmetrical square pyramidal geometry.
  2. CsBr crystal has face centred cubic structure.
  3. MgAl2O4 and Fe3O4 are identical in crystal structure.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  1. Pentaborane-11 (B5H11) has an unsymmetrical square pyramidal geometry, in which five boron atoms occupy the five corners of a square pyramid.
    1. The crystal of CsBr has a body centred cubic structure.
    2. MgAl2O4 and Fe3O4 have spinel structures. Hence, statement 1 and 2 both are incorrect.

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