If two axes are of equal length and the third is either shorter or longer than the other two, all angles are 90˚.
Correct answer: B. Tetragonal system
- A. Cubic system
- B. Tetragonal system
- C. Triclinic system
- D. Hexagonal system
Explanation
Option A: In a cubic system, all three axes are of equal length and all are at right angles to each other. Option: B In a tetragonal system, two axes are equal in length and the third axes are either shorter or longer than the other two. All angles are 90°. Option C: In a triclinic system, all three axes and three angles are unequal and none of the angles is 90°. Option D: In a hexagonal system, two axes are of equal length and are in one plane making an angle of 120 ° with each other. The third axis which is different in length than the other two is at a right angle to these two axes.
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Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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