Chemical Indicators Practice Questions

What kind of properties can only be observed when a substance changes into a different substance?

• physical properties

• chemical properties

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the pH scale measure?

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what colour does Universal Indicator go in a liquid with pH of 4?

• red

• yellow

• green

• blue

Tick all the correct statements

• blue litmus paper will turn red in sodium hydroxide

• blue litmus paper will not change colour in sodium hydroxide

• red litmus paper will turn blue in sodium hydroxide

• red litmus paper will not change colour in sodium hydroxide

Tick all the substances that are more alkaline than the milk

• tomato

• blood

• vinegar

• ammonia solution

Strong alkaline will have colour of universal indicator as....

Tick all the ingredients that can be made into common indicator.

• red cabbage

• apple

• blackcurrant

• beetroot

What is the color change observed when phenolphthalein is added to a basic solution?

• Colorless to pink

• Pink to colorless

• Colorless to red

• Red to colorless

Which of the following is a natural indicator?

• Methyl orange

• Phenolphthalein

• Red cabbage

• Bromothymol blue

What is the pH range in which methyl orange changes color?

• 3.1 to 4.4

• 4.4 to 6.2

• 6.2 to 7.6

• 7.6 to 9.0