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Question
Soap is a salt of ______ and sodium hydroxide.
Options
white cement
soap
detergent
wearing of bones
tooth decay
hard
soft
Portland
fatty acid
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Solution
Soap is a salt of fatty acid and sodium hydroxide.
RELATED QUESTIONS
A student takes four test tubes marked P, Q, R and S of 25 mL capacity and fills 10 mL of distilled water in each. He dissolves one spoon full of four different salts in each as − KCl in P, NaCl in Q, CaCl2 in R and MgCl2 in S. He then adds about 2 mL of a sample of soap solution to each of the above test tubes. On shaking the contents of each of the test tubes, he is likely to observe a good amount of lather (foam) in the test tubes marked
(a) P and Q
(b) R and S
(c) P, Q and R
(d) P, Q and S
Explain the formation of scum when hard water is treated with soap.
A student took four test tubes P, Q, R and S and filled about 8 mL of distilled water in each. After that he dissolved an equal amount of Na2SO4 in P, K2SO4 in Q, CaSO4 in R and MgSO4 in S. On adding an equal amount of soap solution and shaking each test tube well, a good amount of lather will be obtained in the test tubes:
(a) P and Q
(b) P and R
(c) P, Q and S
(d) Q, R and S
State one use of saponification process.
What change will you observe if you test soap solution with a litmus paper (red and blue)? Give reason for your observation.
Which of the two is better for washing clothes when the water is hard: soap or detergent? Give reason for your answer.
Explain the action of soap in removing an oily spot from a piece of cloth.
How will you check with the help of soap powder whether water is hard?
Match the following
| 1. | Soap | C6H5 OH |
| 2. | Cement | CaSO4.2H2O |
| 3. | Fertilizers | NaOH |
| 4. | Gypsum | RCC |
| 5. | Phenol | NPK |
TFM in soaps represents ______ content in soap.
