Question
How does red rose extract act as an indicator?

Answer

In acidic solutions, red rose extract gives a red colour. In basic solutions, red rose extract gives a green colour.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A sewage treatment plant involves a few steps. Aeration tank, grit and sand removal tank, second sedimentation tank, bar screen, first sedimentation tank.
(i)Arrange all the above steps in the correct order in which they occur in the sewage treatment plant.
(ii)Which step gives most of the sludge?
Burning of crackers is a chemical change. Justify the given statement.
Images in a mirror are located at the same distance behind the mirror as the object in front of it. Explain the importance of this property of mirror.
Describe the effects of heat.
Why is it important to educate both boys and girls about menstruation and reproductive health?
Paheli is suffering from indigestion due to acidity. Is it advisable to give her orange juice in this situation and why?
Write the differences between respiration taking place in humans and fish.
Observe the diagrams (i) and (ii) shown below.
Image

→ In Figure (i), a boy is looking at a candle flame through a straight pipe.
→ In Figure (ii), the candle flame is viewed through a bent pipe.
(a) Explain why the candle flame is visible through a straight pipe but not through a bent pipe.
(b) If a mirror is placed at the bend of the pipe in the second setup, can the candle flame be seen? Justify your answer with a scientific explanation.
Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in anyway?
Which of the following are not correct?
(a) The basic unit of time is second.
(b) Every object moves with a constant speed.
(c) Distances between two cities are measured in kilometres.
(d) The time period of a given pendulum is not constant.
(e) The speed of a train is expressed in $m / h$.