Question

On adding a few drops of universal indicator solution to three unknown colourless solutions P, Q, and R taken separately in three test-tubes shown in the diagrams, a student observed the changes in colour as green in solution P, red solution Q and violet in solution R. The decreasing order of the pH of the three solution is (1) P > Q > R
(2) R > P > Q
(3) Q > P > R
(4) R > Q > P

Answer 1

Answer:

(2) R > P > Q

Explanation:

• On adding a few drops of universal indicator solution to a solution, if the colour changes to green, then the solution is neutral. Hence, it's pH value is 7.

➡ Solution P changes to green colour, therefore, its pH value is 7.

• If the solution changes to red colour or related to red colour, then the solution is acidic. Its pH range would be less than 7.

➡ Solution Q changes to red colour, therefore, the pH of solution Q is less than 7.

• If the solution changes to violet colour or related to violet colour, then the solution is basic. Its pH range would be greater than 7.

➡ Solution R changes to vioet colour, therefore, the pH of solution R is greater than 7.

ANS) The decreasing order of the pH of the three solution is :( 2 ) R > P > Q

Thanks!

Answer 2

The decreasing order of the pH of the three solutions is R > P > Q.

Explanation:

The first test-tube has the solution in a green colour. The second test tube has a red-coloured solution and the third test tube has violet coloured test tube. When the solution is neutral, then it shows that the pH of the solution is 7. When the pH is zero, it shows that the solution in tube Q is acidic. The solution in test tube R is violet. So, it is the base.  

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