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1. Name the acid that renders aluminium passive. Why?
Dilute or concentrated renders aluminium passive. Because nitric acid does not attack aluminium, it renders aluminium passive due to the formation of an film on its surface.
2. a) Identify the bond between H and F in HF molecule.
b) What property forms the basis of identification?
c) How does the property vary in periods and in groups?
b) What property forms the basis of identification?
c) How does the property vary in periods and in groups?
a. The bond between H and F in the HF molecule is .
b. The property of forms the basis of identification.
c. Along the period, from left to right in the periodic table, the because of the increase in the , which attracts the electrons more strongly. On moving down a group, the of the elements decreases because of the increased number of energy levels.
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