Chemistry · May / June 2021 · Paper 12 · Question 23

Four test-tubes are set up as shown. AgNO3(aq) W, Cu(NO3)2(aq) X, Pb(NO3)2(aq) Y, NaNO3(aq) Z What is the effect of adding dilute hydrochloric acid to each test-tube? key: x = clear solution, ✓ = precipitate formed

1. AW x, X ✓, Y x, Z ✓
2. BW ✓, X x, Y ✓, Z x
3. CW ✓, X x, Y ✓, Z ✓
4. DW ✓, X x, Y x, Z x

As printed in the paper