Dyes

Q. What is meant by dyes? Write their uses.

Q. For which of the following purposes dyes are used?

1. Colouring of clothes and hair
2. Clogging of sweat pores
3. Polishing of leather shoes
4. Making cosmetics

Q.

Which of the following does not contain natural dyes?

1. Potato
2. Beetroot
3. Carrot
4. Turmeric

Q. Assertion [A]: Tartrazine should be preferred over beetroot as a food additive.
Reason [R]: Artificial colours are detrimental to health.

1. (A) and (R) both are correct and (R) is correct explanation of (A) .
2. (A) and (R) both are correct but (R) is not the correct explanation of (A).
3. (A) is correct but (R) is not correct.
4. (A) is not correct but (R) is correct.

Q. is an artificial food colouring agent.

1. Tartrazine
2. Saffron
3. Beetroot

Q. Which of the following is the characteristic property of a dye?

1. Water soluble and oil insoluble.
2. Oil solube and water insoluble.
3. Water solube and oil soluble.
4. Water insolube and oil insoluble.

Q. Assertion [A]: Tetrazene should be preferred over beetroot as a food additive.
Reason [R]: Artificial colours are detrimental to health.

1. (A) and (R) both are correct and (R) is correct explanation of (A) .
2. (A) and (R) both are correct but (R) is not the correct explanation of (A).
3. (A) is correct but (R) is not correct.
4. (A) is not correct but (R) is correct.

Q. Which among the following are the sources of natural dyes?

1. Minerals
2. Flowers
3. Petroleum
4. Roots

Q. The harmful elements present in small quantities in food colour are:

1. Lead
2. Mercury
3. Magnesium
4. Aluminium

Q.

Which of the following does not contain natural dyes?

1. Potato
2. Beetroot
3. Carrot
4. Turmeric

Q. <!--br {mso-data-placement:same-cell;}--> Which among the following are the sources of natural dyes?

1. Minerals
2. Ores
3. Petroleum
4. Roots

Q. Mordant is used to fix the colour of dyes.

1. False
2. True

Q. An artificial dye causes harmful effects like hair fall, skin and eye irritation.

1. True
2. False

Q. Choose the areas where dyes are used.

1. Cloth industry
2. Salon
3. Signboards
4. Paints
5. Shoe polish
6. Drinking water
7. Colours
8. Mirror