The equation for the reaction between aluminium and copper(II) oxide is shown. Which statements about this equation are correct? 1 The oxidation number of the aluminium reactant is +2 . 2 The oxidation number of the aluminium in the product is +6 . 3 The oxidation number of the copper in the reactant is +2 . 4 The oxidation number of the copper product is 0.
A.
1, 2 and 3
B.
1 and 2 only
C.
3 and 4
D.
4 only
Exam No：0620_s24_qp_22 Year：2024 Question No：17
Answer:
C
Knowledge points:
8.2.1.1. decreasing melting point
8.2.1.2. increasing density
8.2.1.3. increasing reactivity
8.2.2. Predict the properties of other elements in Group I, given information about the elements
Solution:
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