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NEET2017ChemistrySolid StateActual

A cubic unit cell of a metal with molar mass of 63.55 ~g ~mol ⁻¹ has an edge length of 362 pm . Its density is 8.92 ~g ~cm ⁻³ . The type of unit cell is

Options

  1. Aprimitive
  2. Bface centred
  3. Cend centred
  4. Dbody centred

Correct answer

B. face centred

Step-by-step solution

aligned & Density = Z M a^3 N_A & = d N_A a^3 M & = 8.92 6.023 10²³ (362 10⁻¹⁰ )^3 63.55 =4 aligned The metal crystallises in fcc.

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