Question 3B

                       (a)        Name one gas which:

                        (i)         cannot be collected over water;
(ii)        can be dried with concentrated H2SO4:
(iii)       changes the orange/yellow colour of K2Cr2O7/H+(aq).

Give a reason for your answer in each case. 
[6 marks]
(b)        State the chemical process involved in the following conversions:

                        (i)         palm wine to ethanol;

(ii)        Pb(NO3)2(aq) to PbCO3(s) using K2CO3(aq);     

(iii)       NH4Cl(s) to NH3(g) and HCl(g);

                            (iv)       Starch to glucose using hot HCl(aq)                                        [4 marks]