Question
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
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| Ion | Valency(Charges) | Ion | Valency(Charge) |
| Sodium ion | $1+$ | Nitrate ion | $1-$ |
| Copper ion | $2+$ | Sulphide ion | $2-$ |