Which of the following metals is purified commercially by electrolysis?
What current will deposit 3.25g of zinc in 2 hours?
[Zn = 65, F = 96500 C mol-1]
If a given quantity of electricity liberates 0.65g of Zn2+, what amount of Hg2+ would be liberated by the same quantity of current?
[Zn = 65, Hg = 201]
Which of the following reactions is endothermic?
C(s) + O2(g) → CO2(g)
CaO(s) + H2O(l) → Ca(OH)2(s)
C(s) + H2O(g) → CO(g) + H2(g)
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
The reddish-brown rust on iron roofing sheets consists of
The ion that will give a white precipitate with aqueous NaOH and soluble in excess of the base is