F.4 Chem MC Need Reason!!!
X and Y are two different metals. Which of the followings shows that Y is more reactive than X?
A. X forms an ion with a charge of +2 while Y forms an ion with a charge of +1
B. X reacts with dilute hydrochloric acid but Y does not.
C. X can displace Y form an aqueous solution of a salt of Y.
D. The oxide of X undergoes decomposition upon strong heating but the oxide of Y does not.
- Gabriella MontezLv 71 十年前最愛解答
Option A: It is only true when elements X and Y are in the same period, e.g. in Period 4, K is more reactive than Ca.
Option B: If so, then it's X more reactive than Y.
Option C: Again, it shows that X is more reactive than Y, as a more reactive metal ( M1 ) displays a less reactive metal ( M2 ) in M2's aqueous solution.
Option D: Correct. It shows that X forms a less stable ore and extraction of it from its ore is easier, as only directly heating is required.
Ans: D資料來源： My Chem Knowledge