NH4Cl crystallizes in a body-centred cubic lattice with edge length of unit cell equal to 387 pm. If the radius of the Cl− ion is 181 pm, radius of NH4+ ion is:
Correct answer: A. 154.1 pm
- A. 154.1 pm
- B. 92.6 pm
- C. 366.3 pm
- D. None of these
Explanation
In body centred cubic lattice, oppositely charged ions touch each other along the cube.
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About Shape of Ionic Crystals
Ionic crystal shape depends on the regular arrangement of oppositely charged ions in a three-dimensional lattice. The topic covers coordination number, radius ratios, lattice geometry and structures such as sodium chloride, caesium chloride and zinc sulfide, which should not be confused with the molecular shapes predicted by VSEPR theory.
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