Acid and Base

Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.

• Name of the substances Effect on turmeric indicator

  Hydrochloric acid Yellow to blue

  Sodium hydroxide Yellow to red

  Sugar solution No change

• Name of the substances Effect on turmeric indicator

  Hydrochloric acid Yellow to red

  Sodium hydroxide Yellow to blue

  Sugar solution No change

Tags

NGSS.MS-PS1-2

Name any one natural indicator

The diagram shows the pH values of four solutions. Which of these solutions are ACIDIC ?

• P only

• P and Q only

• Q, R and S only

• R and S only

Tags

NGSS.MS-PS1-2

When acid is added to base, it will form salt and water. This reaction is called …

• Neutralization

• Photosynthesis

• Exothermic

• Endothermic

Tags

NGSS.MS-PS1-5

Which solutions is/are acidic ?

• W only

• X and Z

• Y only

• All above

Tags

NGSS.MS-PS1-2

A Solution, when placed in the three indicators separately, is yellow in methyl orange, blue

in bromothymol and colorless in phenolphthalein. Find the range of its pH

• 7.5 - 10

• 8 - 10

• 6.5 - 7.5

• 7.5 - 8.5

Solution U and V were tested with a fewer drops of methyl orange. Solution U turned the indicator red while solution V turned the indicator yellow. Which statement is correct ?

• Solution U has higher pH than Solution V

• The pH of solution U and V are same

• Solution U has lower pH than Solution V

• Solution U is neutral

Tags

NGSS.MS-PS1-2

An element E is burned in air. A white solid oxide is formed. The oxide is tested with damp red litmus paper. The paper turns red. What is the oxide ?

• Acid

• Base

• Neutral

• Salt

Which reaction will result in an increase in pH ?

• Adding sulfuric acid to hydrochloric acid

• Adding potassium hydroxide to sulfuric acid

• Adding water to salt

• Adding hydrochloric acid to water

Which is not a typical property of a base ?

• They turn litmus paper red

• They turn bromothymol blue to blue

• They turn methyl red to yellow

• They turn red litmus paper to blue