9) How do you test for carbohydrates?
10) Make a list of food items eaten during lunch by you. Try to mention the components in
each food item?
11) Write about balanced diet?
12) Why are acids not stored in a metal container?
13) Write an experiment to know the reaction of acids with metals?
14) What is acid rain? Write about it?
Answers
Answer:
Ans 9 - Take 2ml of given sample solution in a clean test tube. Add 2 ml of Fehling's solution A and Fehling's solution B to it. Keep the solution in a boiling water bath for about 10 minutes. If there is the formation of red precipitate then the presence of carbohydrate is confirmed.
Ans 11 - A balanced diet is a diet that contains differing kinds of foods in certain quantities and proportions so that the requirement for calories, proteins, minerals, vitamins and alternative nutrients is adequate and a small provision is reserved for additional nutrients to endure the short length of leanness.
Ans 12 - Reactivity of Metal Containers
When metal reacts with acid, salt and hydrogen gas are produced. This ultimately reduces the volume of the chemical being contained. As well as this, acid is a highly corrosive substance with the ability to eat away at most materials.
Ans 13 - Take about 10 ml of dilute HCl in a test tube and add a few zinc granules to it. We will observe the formation of gas bubbles on the surface of zinc granules. Pass the gas being evolved through the soap water. Gas filled bubbles are formed in the soap solution which rise into the air.
Ans - 14 Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents. The SO2 and NOX react with water, oxygen and other chemicals to form sulfuric and nitric acids. These then mix with water and other materials before falling to the ground.
PLEASE MARK AS A BRAINLIEST