MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Indicators and Universal Indicator

A student was...

Question

A student was given four unknown solutions in test-tubes marked A, B, C and D and asked to test them with universal indicator solution. He observed that on putting universal indicator solution, the solutions A, B, C and D turned blue, orange, green and red respectively. The test-tube which contains sodium chloride solution is :
(1) A
(2) B
(3) C
(4) D

Open in App

Solution

Formation of NaCl is an example of a neutralization reaction. It is formed by the reaction of strong acid and strong base. It has a neutral nature, so it shows a green colour with a universal indicator.

Hence, the correct answer is option 3.

Suggest Corrections

thumbs-up

1

Similar questions

Q. A student was given two test-tubes A and B each containing a colourless solution. When a few drops of universal indicator were added to the two test-tubes, one by one, then the colour of solution in test-tube A changed to blue whereas the colour of solution in test-tube B changed to orange.
(a) Which test-tube has a solution of pH higher than 7?
(b) Which test-tube has a solution of pH lower than 7?
(c) Which test-tube has an acidic solution?
(d) Which test-tube has an alkaline solution?

Q. A student was given an unknown solution in a test-tube. When he added universal indicator to the test-tube, the solution turned violet. The unknown solution is most likely to be :
(1) baking soda solution
(2) washing soda solution
(3) caustic soda solution
(4) household ammonia solution

Q. Four solutions

A, B, C

D

when tested with universal indicator showed

p H

4, 11, 7

9

respectively. Which solution is weakly alkaline?

Q. In an experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in four beakers containing solutions A, B, C and D. The colour of universal indicator paper in these solutions is as shown below :

The solution having lowest pH value is:
(1) A
(2) B
(3) C
(4) D

Q. In an experiment to measure the pH values by using a universal indicator, a student found that the pH values of four given solutions A, B, C and D are 10, 6, 2 and 14 respectively. The solution which will require the maximum volume of sodium hydroxide solution for complete neutralisation is solution :
(1) A
(2) B
(3) C
(4) D

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Visual Indicators

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Indicators and Universal Indicator

Standard VII Chemistry

Join BYJU'S Learning Program

CrossIcon