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Which is true about Rochelle's salt and lead zirconate?
(A) Rochelle's salt is ferroelectric while lead zirconate is anti-ferroelectric
(B) Rochelle's salt is anti-ferroelectric and lead zirconate is ferroelectric
(C) Both are ferroelectric
(D) Both are anti- ferroelectric
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Which is true about Rochelle's salt and lead zirconate?
(A) Rochelle's salt is ferroelectric while lead zirconate is anti-ferroelectric
(B) Rochelle's salt is anti-ferroelectric and lead zirconate is ferroelectric
(C) Both are ferroelectric
(D) Both are anti- ferroelectric

Answer

Answer: A
Rochelle saltis a potassium-sodium tartratetetrahydrate (KNaC4H4O. 4H2O) and belongs to the family of uniaxialferroelectrics.

Lead zirconate(PbZrO3) is anantiferroelectricmaterial melting at about 12507deg;C and having the Curie temperature of 230C.1
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