Chemistry
Answer the following questions with reference to electrorefining of copper:
(a) What is the anode made of?
(b) What do you observe at the cathode?
(c) Write the reaction taking place at the cathode.
Related Questions
Give reason for the following:
(a) Ionisation potential decreases down a group.
(b) Ionic compounds do not conduct electricity in solid state.
Calculate:
(a) The percentage of phosphorus in the fertilizer super phosphate Ca(H2PO4)2 correct to 1 decimal point.
[At. Wt. H=1, P=31, O=16, Ca=40]
(b) Write the empirical formula of C8H18
Arrange the following according to the instructions given in brackets:
(a) C2H2, C3H6, CH4, C2H4 (In the increasing order of the molecular weight)
(b) Cu2+, Na+, Zn2+, Ag+ (The order of Preferential discharge at the cathode)
Differentiate between the following pairs based on the criteria given in the brackets:
(a) Cane sugar and hydrated copper sulphate [using concentrated H2SO4]
(b) Sulphuric acid and hydrochloric acid [type of salts formed]