Indicators

What color would you expect basic solution to turn if universal indicator was added to it?

• Green

• Violet

• Red

• Yellow

If a student tested a solution with blue litmus paper and it remained blue, what does this mean?

• The litmus paper is old, they should open a new pack and try again.

• The solution is neutral.

• The solution is an acid.

• The solution is a base.

• Need to test with red litmus for confirm that the solution is a base

Tags

NGSS.MS-PS1-2

Which solution can turn phenolphthalein pink?

• Sodium hydroxide

• Vinegar

• Tomato

• Hydrochloric acid

Which solution would turn litmus red?

• Potassium hydroxide

• Sodium chloride

• HNO₃

• Ammonia

Which solution would turn litmus blue?

• HCl

• Citric fruits

• H₂SO₃

• NH₃

What is the nature of the solution present in the beaker?

• Alkali

• Acidic

• Neutral

• Water

Tags

NGSS.MS-PS1-2

Which of the set of pH paper depicts that the dipped solution is highly acidic?

(compare with the pH scale and find out)

• 
• 
• 

Blue litmus turning red in an _______________

• Acids

• Bases

• Salts

• None of these

Name the 2 type of Indicators

• Universal indicators

• National Indicators

• Both A and B

Which of the following is a natural indicator?

• Litmus

• Phenolphthalein

• Methyl orange

• Bromothymol blue