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Question
The chemical which is not required for the preparation of soap in the laboratory is:
(a) vegetable oil
(b) baking soda
(c) caustic soda
(d) common salt
Solution
baking soda
Baking soda is not required for the preparation of soap in the laboratory. For the preparation of soap, vegetable oil, caustic soda and common salt are needed.
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RELATED QUESTIONS
A student takes about 4 ml of distilled water in four test tubes marked P, Q, R and S. He then dissolves in each test tube an equal amount of one salt in one test tube, namely sodium sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. After that he adds an equal amount of soap solution in each test tube. On shaking each of these test tubes well, he observes a good amount of lather (foam) in the test tube marked
(A) P and Q
(B) Q and R
(C) P, Q and S
(D) P, R and S
State one use of saponification process.
While studying the saponification reaction, what do you observe when you mix an equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in a beaker?
(A) The colour of the mixture has become dark brown
(B) A brisk effervescence is taking place in the beaker
(C) The outer surface of the beaker has become hot
(D) The outer surface of the beaker has become cold
Fill in the following blank with suitable word:
............. is better than soap for washing clothes when the water is hard.
Describe the structure of a soap molecule with the help of a diagram.
What are the differences between Soap and synthetic detergent?
Explain why soap cannot be used in hard water.
TFM in soaps represents ______ content in soap.
We are using ______ to remove strong stains on the clothes.
- Write the formula and draw electron dot structure of carbon tetrachloride.
- What is saponification? Write the reaction involved in this process.
