Chemistry · Oct / Nov 2021 · Paper 11 · Question 22

Two solutions are prepared. ● Solution P is 0.050 mol / dm3 hydrochloric acid. ● Solution Q is 0.100 mol / dm3 butanoic acid. A 2 cm strip of magnesium ribbon is put into 100 cm3 of each solution. Fizzing is seen in both solutions but the fizzing is faster in solution P than it is in solution Q. Which statement helps to explain this observation?

1. AMagnesium reacts with solution P to form a salt, but does not form a salt with solution Q.
2. BMore particles are dissociated in solution P than are dissociated in solution Q.
3. CSolution Q contains a stronger acid than solution P.
4. DThe particles are closer together in solution Q than they are in solution P.

As printed in the paper