Question:
Which of the following is an example of double salt?
Which of the following is an example of double salt?
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Remember: Double salts lose their identity in solution, while coordination compounds retain their complex form.
Updated On: Oct 14, 2025
- Bleaching powder
- K$_4$[Fe(CN)$_6$]
- Hypo
- Potash alum
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The Correct Option is D
Solution and Explanation
Step 1: Understanding double salts.
Double salts are crystalline salts obtained by the combination of two different salts. They dissociate completely into simple ions when dissolved in water.
Step 2: Analysis of options.
(A) Bleaching powder: A compound used as disinfectant, not a double salt.
(B) K$_4$[Fe(CN)$_6$]: This is a coordination compound, not a double salt.
(C) Hypo (Na$_2$S$_2$O$_3$·5H$_2$O): A simple hydrated salt, not a double salt.
(D) Potash alum: Correct — Potash alum (K$_2$SO$_4$·Al$_2$(SO$_4$)$_3$·24H$_2$O) is a well-known double salt.
Step 3: Conclusion.
Thus, the correct answer is (D) Potash alum.
Double salts are crystalline salts obtained by the combination of two different salts. They dissociate completely into simple ions when dissolved in water.
Step 2: Analysis of options.
(A) Bleaching powder: A compound used as disinfectant, not a double salt.
(B) K$_4$[Fe(CN)$_6$]: This is a coordination compound, not a double salt.
(C) Hypo (Na$_2$S$_2$O$_3$·5H$_2$O): A simple hydrated salt, not a double salt.
(D) Potash alum: Correct — Potash alum (K$_2$SO$_4$·Al$_2$(SO$_4$)$_3$·24H$_2$O) is a well-known double salt.
Step 3: Conclusion.
Thus, the correct answer is (D) Potash alum.
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