Which of the following statements (s) is/are correct? A. Ferromagnetic substances are permanently magnetised.B. AgBr shows both Schottky and Frenkel defects.C. One tetrahedral void per atom is present in the HCP structure.
Correct answer: D. A & B
- A. A & C
- B. A, B & C
- C. B only
- D. A & B
Explanation
A.Ferromagnetic substances are permanently magnetised.Correct.Ferromagnetic materials (like iron, cobalt, nickel) have magnetic domains that can align permanently, causing the material to stay magnetized even after the external magnetic field is removed.B. AgBr shows both Schottky and Frenkel defects.Incorrect.AgBr primarily shows Schottky defects (missing equal numbers of Ag+ and Br- ions) but not Frenkel defects because the size difference between Ag+ and Br- ions makes Frenkel defects unlikely. Frenkel defects are common in ionic compounds where cations are much smaller than anions (like AgCl, AgI), but not typically in AgBr.C. One tetrahedral void per atom is present in the HCP structure.Correct.In hexagonal close packing (HCP), the number of tetrahedral voids is exactly twice the number of atoms, but per atom, there is effectively one tetrahedral void (since one atom corresponds to 2 tetrahedral voids, per atom it's 2/2 = 1). So this statement is true in standard interpretations
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