Question

How many of the following metals can displace copper from its salt solution?
Gold, Iron, Sodium , Mercury, Potassium, Aluminium, Magnesium, Platinum, Calcium​

Answer 1

Answer:

sodium

potassium

aluminium

calcium

Answer 2

The metals that can displace copper from its salt solution are sodium, potassium, aluminium and iron.

• Metals having lower reactivity are easily replaced by the metals having higher reactivity in the series.
• Gold and silver are examples of noble metals and the meaning of noble metals in chemistry is that they are least reactive on comparing with other metals. So, copper is more reactive as compared to gold and silver.
• Here, mercury is a liquid non-metal. so, it can not replace the copper from its salt. Sodium and potassium are the metals that are more reactive than copper metal.
• The order of reactivity series are as follows:

Al>Zn>Fe>Pb>H>Cu

• This means that aluminium and iron are also more reactive than copper. So, they can displace copper from its salts.

Hence, sodium, potassium, aluminium and iron is the answer.