An iron knife dipped in a blue copper sulphate solution turns the blue solution light green. Why ?

State the reason for the following : An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green.

Define displacement reaction. An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain.

(a) All ores are minerals but all minerals are not ores. Justify. (b) An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain. (c ) An athlete won a bronze medal in a race competition. After some days, he found that the medal had lost its lustre due to the formation of a greenish layer on it. Name the metals present in the medal. What is the reason for the formation of a greenish layer on its surface ?

State the reason why (i) carbon is not used to reduce the oxides of sodium or aluminium. (ii) an iron strip dipped in a blue copper sulphate solution turns the blue solution to pale green. (iii) calcium does not occur free in nature. (iv) zinc is used in the galvanisation of iron and not copper.

State the reason why (i) carbon is not used to reduce the oxides of sodium or aluminium. (ii) an iron strip dipped in a blue copper sulphate solution turns the blue solution to pale green. (iii) calcium does not occur in free state in nature. (iv) zinc is used in the galvanisation of iron and not copper.

When a piece of zinc is added to blue copper sulphate solution, the solution becomes