Question

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. This is shown in the following experimental setup  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 change in color of liquid in tube 2
(d)The movement of gas between the test tubes​

Answer 1

Answer:

I think answer is d. because above 3 make sense of chemical reaction