Science

Materials: Metals and Non Metals

Question:

Copper cannot displace zinc from its salt solution.

Answer:

A metal can displace a less reactive metal from its salt in an aqueous solution. But zinc is more reactive than copper. Therefore, copper cannot displace zinc from its salt solution. Cu(s) + ZnS04 (aq) —? No reaction
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Questions and Answers

Materials: Metals and Non Metals

Q 1.

Sodium and potassium are stored in kerosene.
Answer

Q 2.

Aluminium foils are used to wrap food items.
Answer

Q 3.

Copper cannot displace zinc from its salt solution.
Answer

Q 4.

Can you store lemon pickle in an aluminium utensil? Explain.
Answer

Q 5.

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?
Answer

Q 6.

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.
Answer

Q 7.

Immersion rods for heating liquids are made up of metallic substances.
Answer

Q 8.

Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas? (b) Write down word equations of all the reactions taking place in this process.
Answer