Interpretation:
Whether a metal always replace another metal in a compound dissolved in water or not needs to be explained.
Concept introduction:
The reactivity series of metals is as follows:
Lithium > Rubidium > Potassium > Calcium > Sodium > Magnesium > Aluminium > Manganese > Zinc > Iron > Nickel > Tin > Lead > Copper > Silver > Platinum > Gold

Answer to Problem 79A
A will replace another metal in a compound dissolved in water depending on its position in the reactivity series of metals.
Explanation of Solution
The reactivity series of metals is as follows:
Lithium > Rubidium > Potassium > Calcium > Sodium > Magnesium > Aluminium > Manganese > Zinc > Iron > Nickel > Tin > Lead > Copper > Silver > Platinum > Gold
And the activity series of halogens is given as follows:
Fluorine > Chlorine > Bromine > iodine
The metal higher on the series is the most active and will not be precipitated. The metal lower on the series is less active and hence will be precipitated.
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