Cleansing Action

Q.

What is the formula for soda water?

Q.

Write the chemical formula of lime water

Q.

Q 11 Mention one use of reagent bottle.

Q.

The common adulterant found in red chili powder is

1. Coloured saw dust

2. Used tea powder

3. Metanil yellow

4. Papaya seed powder

Q.

Explain why -

(i) Oil does not mix in water. However, oil and water become homogeneous if a sufficient quantity of detergent is added.

(ii) Soap cannot be used in hard water.

Q. A solution of detergent is added to the mixture of oil and water. What will you observe on shaking the above mixture?

1. Oil floats on the water
2. Solution becomes homogeneous
3. Solution becomes milky in appearance
4. Solution becomes transparent

Q. Write mechanism of cleaning action of detergents.

Q.

When a dirty shirt is soaked in soap water, the hydrophobic part attaches to the ______ molecules.

Q.

The ionic-end of soap dissolves in ___ while the carbon chain dissolves in ___.

1. water, oil

2. oil, lather

3. lather, water

4. oil, oil

Q. Glycerol is added to soap. It functions :

1. as a filler
2. to increase lathering
3. to prevent rapid drying
4. to make soap granules

Q. Explain the cleansing process of the soap and detergent.

Q.

Temporary hardness of water can be removed by

1. Addition of chlorine

2. Filtration

3. Addition of potassium permagenate

4. Boiling

Q. Assertion :Detergents are better cleansing agents than soaps. Reason: A soap contains a $COO-$ group, which is capable of dispersing the attractive forces between water molecules, known as "surface tension", but will not be able to do this indefinitely. Detergents on the other hand contain an $O-S{O}_3-$ group with the same ions which can hold this force at bay.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	$C{H}_3(C{H}_2{)}_{10}C{H}_{2}OS{O}_3^{-}N{a}^{+}$	(i)	Cationic detergent
(B)	$\left[C{H}_3\right(C{H}_2{)}_{15}N(C{H}_3{)}_2-C{H}_3{]}^{+}B{r}^{-}$	(ii)	Non-ionic detergent
(C)	$C{H}_3\left(C{H}_2{)}_{16}COO\right(C{H}_{2}C{H}_{2}O{)}_{n}C{H}_{2}C{H}_{2}OH$	(iii)	Soap
(D)	$C_{17}{H}_{35}COONa$	(iv)	Anionic detergent

1. (A) $\to$(iv), (B) $\to$(i), (C) $\to$(ii), (D) $\to$(iii)
2. (A) $\to$(ii), (B) $\to$(iv), (C) $\to$(i), (D) $\to$(iii)
3. (A) $\to$(iii), (B) $\to$(ii), (C) $\to$(iv), (D) $\to$(i)
4. (A) $\to$(i), (B) $\to$(iii), (C) $\to$(iv), (D) $\to$(ii)

Q. The ionic end of soap dissolves in , while its carbon chain dissolves in .

1. water
2. oil
3. lather
4. acid

Q. How cloth is cleaned with the help of detergents?

Q. Micelles are used in__________.

1. petroleum recovery
2. detergents
3. magnetic separation
4. all of these

Q. ___ dissolves in a solvent to form a solution.

Q. (a) How does ethanoic acid react with sodium hydtrogencarbonate? Give equation of the reaction which takes place.
(b) Why are carbon and its compounds used as fuels for most applications?
(c) Which of the two is better for washing clothes when the water is hard: soap or detergent?
Give reason for your answer.