The figure given below shows the colour change in test tubes A,B and C when china rose indicator is added in them. The respective solutions in test tubes A, B and C are

On adding a few drops of universal indicator to three unknown colourless solutions P, Q and R taken separately in the three test tubes. A student observed the changes in colour as green in P, red in Q and violet in R.The decreasing order of pH of the solutions taken is :P > Q > RR > P > QQ > P > RR > Q > P

You have been provided with three test tubes. One of them containsdistilled water and the other two contain an acidic solution and a basicsolution, respectively. If you are given only red litmus paper, how willyou identify the contents of each test tube?

According to the pre-lab presentation, which of the following is a reason for a "false positive" conclusion that a chemical reaction occurred in the test tube?Group of answer choicesTwo clear colorless liquids are combined and produce no visual change (still a clear colorless liquid) when the test tube is agitated.Bubbles are observed after the test tube is agitated.An odor is generated when the test tube is agitated.A red color in the test tube changes to a blue color after the test tube is agitated.

The change in colour of the moist litmus paper in the given set up is due toi. presence of acidii. presence of baseiii. presence of H⁺(aq) in the solutioniv. presence of Litmus which acts as an indicator(a) i and ii(b) Only ii(c) Only ii

.Which test shows a positive result with a colour change of blue to purple?