Chemical Indicators Practice Questions

Which Ph Scale number shows an base?

• 1

• 3

• 7

• 10

On the pH scale the number 7 indicates the substance is?

• acidic

• neutral

• alkaline

Special type of substances are used to test whether a substance is acidic or basic. These substances are known as

• Indicators

• Gudhal

• None of the above

Acids turn ____________ and Bases turn_____________.

• Both turn red litmus blue

• Blue litmus red, Red litmus blue

• Both turn blue litmus red

• No change

Change in colour in an acid and a base depends on the type of indicator.

• True

• False

If an indicator gives changes colour with a acid it does not change colour with an acid.

• True

• False

Which are indicators/evidence of a chemical reaction? (Select all correct answers)

• produces gas

• produces a precipitate

• change in shape

• unexpected temperature change

• unexpected color change

Tags

NGSS.MS-PS1-2

What is the role of a chemical indicator in a titration experiment?

• To change the color of the solution at the endpoint

• To react with the titrant

• To neutralize the solution

• To increase the temperature of the solution

Which of the following is a natural indicator?

• Phenolphthalein

• Methyl orange

• Litmus

• Bromothymol blue

What color does phenolphthalein turn in a basic solution?

• Red

• Pink

• Colorless

• Blue