Question

which of these is national indicator a. turmeric b. litmus paper c. turmeric but not litmus paper d. both ( a) and ( b)
​

Answer 1

Answer:

both a and b

this is your answer

Answer 2

Answer:

both a) and b)

MORE TO KNOW -

• Indicator - Substances which is used to determine whether the given substances is acidic or basic.

• IT is a chemical compound.

• Natural indicator - Indicators that extracted from plants are called natural indicators.

• Synthetic indicator - Indicators that synthesis( produced in laboratory) are called synthetic indicator.

• Some natural indicator -

i) Litmus

ii) Red cabbage juice

iii) Turmeric etc

• Litmus is a purple colour dye when dipped in acidic medium it turns red , when dipped in basic medium it turns blue.

• Turmeric is yellow in colour it remains natural in acidic medium but when dipped in basic medium it turns reddish or deep brown.

Olfactory indicators -

• Indicators that gives different odours in acidic and basic medium are called olfactory indicators.

• Natural olfactory indicators-

i) Vanilla essence - it has a sweet smell which remains natural in acid but its smell destroyed in basic.

ii) Onion- It has ammoniacal smell which remains natural in acid but destroyed in basic medium.