Advertisements
Advertisements
प्रश्न
A student takes about 6 ml of distilled water in each of the four test tubes P, Q, R and S. He then dissolves an equal amount of four different salts namely, sodium chloride in 'P', potassium chloride in 'Q', calcium chloride in 'R' and magnesium chloride in 'S'. Next, he then adds 10 drops of soap solution to each test tube and shakes its contents. The test tubes in which scum (insoluble substance) is formed with soap are:
(A) P and Q
(B) Q and R
(C) R and S
(D) Q and S
उत्तर
Scum is formed by reaction of soap with calcium and magnesium salts in water. Test tubes R and S contain calcium chloride and magnesium chloride, respectively. Therefore, scum will be formed in these two tubes.
Hence, the correct option is C.
APPEARS IN
संबंधित प्रश्न
How esters are prepared ?
Draw the structure of butanoic acid.
Name the functional group present in an organic compound which gives brisk effervescence with NaHCO3.
How does ethanoic acid react with sodium hydrogen carbonate? Give equation of the reaction which takes place.
Name the products formed and give appropriate chemical equations for the following:
sodium reacting with ethyl alcohol.
A student puts a drop of acetic acid first on a blue litmus paper and then on a red litmus paper. He would observe that
(A) the red litmus paper turns colourless and there is no change in the blue litmus paper.
(B) the red litmus paper turns blue and the blue litmus paper turns red.
(C) there is no change in the red litmus paper and the blue litmus paper turns red.
(D) there is no change in the blue litmus paper and the red litmus paper turns blue.
How is ethyne prepared in the laboratory?
State how the following conversions can be carried out:
Ethyl chloride to Ethene.
Choose the correct alternative and rewrite the following:
Some acetic acid is treated with solid NaHCO3, the resulting solution will be _________________.
Distinguish between esterification and saponification reactions with the help of chemical equations for each.
