Ceist Eile

Ceist Eile is in development. Features, questions and prices may change while we refine it.

Junior Cycle · Junior Cycle Science

Junior Cycle Science: Acids & bases

How often Acids & bases comes up on the Science papers, every year it was asked, and questions to try.

CL Asked on 5 of the last 6 Common Level papers, most recently in 2026. most years

Acids & bases, Common Level(7 marks)

Quick ones on Acids & bases.

(a)Which pH value shows the strongest acid?
  1. pH 6
  2. pH 1
  3. pH 13
(b)What colour does blue litmus turn in an acid?
  1. Purple
  2. Green
  3. Red
(c)An acid reacts with a base to form a salt and?
  1. Water
  2. Hydrogen
  3. Oxygen
Show the answers

(a) pH 1

(b) Red

(c) Water

Your turn: Common Level questions on Acids & bases.

Common Level

Asked on 5 of the last 6 Common Level papers, most recently in 2026. most years

Every paper, year by year

YearWhere it came up
2026Q16
2025Q6
2024Not asked
2023Q8
2022Q9
2019Q6

Links open the State Examinations Commission’s paper for that year.

More Acids & bases questions

Acids & bases, 3 marks

Why does an antacid tablet relieve indigestion?

  1. It is an acid that adds more acid
  2. It makes the stomach lining thicker
  3. It is a base that neutralises acid
Show the answer

It is a base that neutralises acid

Indigestion is often caused by too much stomach acid. An antacid is a base, so it neutralises some of the acid and raises the pH in the stomach.

Acids & bases, 2 marks

What colour is universal indicator in a neutral solution such as pure water?

  1. Purple
  2. Green
  3. Red
Show the answer

Green

Universal indicator is green at pH 7 (neutral), red, orange or yellow in acids, and blue to purple in bases, so it shows roughly how strong an acid or base is.

Other Science topics

All of Junior Cycle Science