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The reaction Z2O3 + 3H2 → 2Z + 3H2O involves the valency of metal Z. What is the valency of Z?

1. 3
2. 2
3. 1
4. 4

Correct answer: 3

Solution

In Z2O3, the oxygen has a valency of -2. Since there are 3 oxygen atoms, the total negative charge is -6. To balance this, the 2 Z atoms must have a total positive charge of +6, making the valency of each Z atom +3.

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