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]
Observation
(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]