Q8 / 164 · NTA Abhyas (NEET) 2020 · Chemistry · Solid State

In face centred cubic arrangement of A and B atoms, A atoms are at the corners of the unit cell and B atoms at the face centres. One of the A atoms is missing from one corner in the unit cell. The simplest formula of the compound is 

  • A
    A7B3
  • B
    AB3
  • Correct answer
    C
    A7B24
  • D
    A7/8B5

Solution

If one atom (A) is missing from one corner,

no. of atoms A in unit cell = 7 × 1 8 = 7 8

no. of atoms B in unit cell = 6 × 1 2 = 3

A⁡ : B⁡ = 7 8 :  3  so simplest formula is A7B24​

Hence, the correct answer is option: 'C'.

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