Crystal having orthorhombic crystal system is:
Correct answer: B. BaSO4
- A. PbCrO4
- B. BaSO4
- C. ZnO
- D. NaOH
Explanation
The correct answer is Barium sulfate (BaSO₄), which crystallizes in the orthorhombic crystal system. This system has three mutually perpendicular axes that are of unequal lengths, a characteristic feature of orthorhombic crystals.In contrast, Lead chromate (PbCrO₄) is not correct as it belongs to the tetragonal system, characterized by one axis being longer than the other two, which are equal in length. Zinc oxide (ZnO) is classified under the hexagonal system, which features a different arrangement altogether, while Sodium hydroxide (NaOH) is cubic, with all axes equal. Thus, the only correct option that matches the orthorhombic classification is Barium sulfate.
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About Crystalline Solids
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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