Bases & Indicators

An acid is a compound which when dissolved in water forms hydroxyl ions as the only _____ ions.

• NEGATIVE
• POSITIVE
• NEUTRAL
• NONE

2.A solution X turns red litmus blue , so it must contain _______ ions

• HYDROXYL
• AMMONIUM
• HYDRONIUM
• NONE

3.Which of the following hydroxides is not an alkali

• ammonium hydroxide
• calcium hydroxide
• Iron (II) hydroxide
• sodium hydroxide

4. To increase the pH value of a neutral solution, we should add

• An acid
• An acid salt
• An alkali
• A salt

5.Mention the colour change when methyl orange is added to a basic solution

• Orange to colourless
• Orange to yellow
• Orange to red
• Orange to blue