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1)Can you store lemon pickle in an aluminium utensil? Explain.
2)What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate solution?
Write word equations of the reactions involved.
One day Reeta went to a jeweller’s shop with her mother. Her mother gave
an old gold jewellery to the goldsmith to polish. Next day when they brought
the jewellery back, they found that there was a slight loss in its weight.
Can you suggest a reason for the loss in weight?
Answers
Answer:
1. No, we cannot store the lemon pickle in aluminium utensil because aluminium is a metal and lemon is acid. The acids react with aluminium to release hydrogen which would spoil the food and render it unfit for use.
2. (a) When dilute sulphuric acid is poured on a copper plate, no reaction takes place due to less reactivity of copper. Copper gets deposited on the iron nail and green solution is ferrous sulphate solution.
(b) When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green.
(c) Goldsmith washed the jewellery with acidic solution such as aqua reiga. This aqua reiga solution dissovled metal in it. Hence there was a slight loss in its weight.