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WorksheetsIndicator Activity
Total questions: 15
Worksheet time: 5mins
Which indicator shows no change in acidic solution?
a) Phenolphthalein
b) Turmeric
c) China rose petals
d) Purple cabbage juice
Both a) and b)
Both c) and d)
Only a)
Only b)
What colour does purple cabbage change into in acidic medium?
Green
Dark green
Pink
Red
What is the colour of red cabbage juice?
Red
Purple
Dark Red
Light Green
From where is litmus obtained and what is it's solution's color?
Hydrangea, purple
Lily, Red
Lichen, Purple
Bluebell, Blue
Which indicators turn red in acidic medium?
a) litmus
b) phenolphthalein
c) methyl orange
d) turmeric
a) and d)
b) and c)
a) and c)
only a)
Q. Which of the following indicators cannot be used by a visually impaired student?
Vanilla essence
Onion extract
Litmus paper
Clove oil
What is the colour of phenolphthalein?
Pink
Dark Pink
Colourless
Red
Which indicator turns green in basic medium?
Turmeric
Phenolphthalein
China Rose
Methyl Orange
What is the colour of china rose indicator?
Red
Dark Pink
Light Pink
Yellow
What is the approximate pH of blood?
7.4
7.9
6.9
7
When dipped in aq. CaCO3 solution, china rose turns-
Red
Purple
Remains pink
Green
Olfactory indicators are those that indicate the nature of a substance through change in smell. Onion and vanilla extract are good examples.
What changes when these are exposed to bases?
Onion - Loses smell; Vanilla - Retains smell
Onion - Starts smelling Sweet; Vanilla - Loses smell
Onion - Retains smell; Vanilla- Loses smell
Onion - Loses smell; Vanilla - Loses smell
Which one is suitable method to find the accurate pH value?
pH meter
pH paper
Universal Indicator
Litmus solution
The pH of which of the following samples cannot be found directly using pH paper?
Lemon Juice
Dilute HCl
Solid Sodium bicarbonate
Solution of a detergent
The pH values of distilled water, lemon juice, sodium bicarbonate were measured using pH paper. What is the correct decreasing order of pH values?
Water > Lemon juice > Sodium bicarbonate
Sodium bicarbonate > Water > Fruit juice
Lemon juice > Water > Sodium bicarbonate
Water > Sodium bicarbonate > Fruit juice
