Chemistry, asked by tamannalenka07, 5 days ago


13. When a bit of baking soda is added to vinegar in a test-tube, a hissing
sound is heard and several bubbles occur. The test tube is closed and
attached by a glass tube to another test tube containing lime water. The
limewater slowly turns milky in the process. Which of the following
CANNOT be considered indicators of a chemical reaction in this
experiment?
a. Occurrence of a hissing sound.
b. The formation of several bubbles.
c. The movement of gas between the test tubes.
d. The change in color of liquid in tube 2.

Answers

Answered by rajat2181
3

Occurence of hissing sound is not an indicator of chemical change.

Answered by Abhijeet1589
0

The phenomenon that is not an indicator or a chemical reaction is Option (c) The movement of gas between the test tubes.

EXPLANATION

  • A chemical reaction is a phenomenon when two or more substances are converted into a different substance.
  • A chemical reaction is indicated through various indicators such as, change of color, production of odor, change of temperature, etc.
  • When baking soda is added to vinegar following reaction takes place

NaHCO₃ + CH₃COOH + CO₂ + H₂O

  • The formation of Bubbles in the solution is evidence that a gas is produced.
  • And, the Evolution of gas is indicated by the hissing sound.
  • Therefore, Options (a) and (b) are indicators of chemical change.
  • In the given experiment, the movement of gas cannot be considered an indicator of a chemical because the movement of gas (fluid) is a physical process and not a chemical process.
  • A chemical change is said to occur only when there is the formation of a new product.
  • When CO₂ reacts with lime water following reaction takes place -

CO₂ + Ca(OH)₂ --------> CaCO₃ + H₂O

  • The color of the solution turns milky white due to the formation of a new product (Calcium carbonate).
  • Therefore, the Change of color in test tube 2 is an indicator of chemical change.

Hence, The correct option is option (c) the occurrence of gas between the test tube.

#Spj2

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