Metal A displaces metal B and metal B displaces metal C from their salts. What is the correct decreasing order of reactivity?
Answer and explanation
Correct answer: A then B then C
The displacement rule states that a metal can displace another metal from its salt only when it is more reactive than that metal. Since A displaces B, A is more reactive than B. Since B displaces C, B is more reactive than C. Combining both relations gives A > B > C, which is the decreasing order. Therefore option A is correct; the other sequences contradict one of the stated displacement observations.
Frequently asked questions
What is the correct answer to this question?
A then B then C
Why is this the correct answer?
The displacement rule states that a metal can displace another metal from its salt only when it is more reactive than that metal. Since A displaces B, A is more reactive than B. Since B displaces C, B is more reactive than C. Combining both relations gives A > B > C, which is the decreasing order. Therefore option A is correct; the other sequences contradict one of the stated displacement observations.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Metals and Non-metals. Topic: Reactivity series.
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