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CHEMISTRY
A universal indicator is...

A universal indicator is

A

an individual indicator

B

a mixture of indicators

C

a solution of methyl orange in ethanol

D

none of the above

Text Solution

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The correct Answer is:
B
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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:

(a). What would you expect the pH of pure water to be? (b). What colour would the universal indicator show in an aqueous solution of sugar? Why? (c). A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?

When a student added universal indicator solution to one of the following chemicals its colour changed to nave blue. The chemical is most likely to be:

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Study the table below which shows different colour produced by universal indicator in A, B, C and D Which of them is strongly basic?

A student was given an unknown solution in a test tube. When he added universal indicator solution to the test tube the solution turned violet. The unknown solution is most likely to be:

When four dilute solutons of (1) vinegar, (II) common salt, (III) caustic soda and (IV) baking soda are tested with universal indicator which will be the correct observation.

BHARATI BHAWAN (ENGLISH)-PRACTICALS -EXERCISE
  1. The hydrogen ion concentration of a liquid is equal to its hydroxide i...

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  2. When rain is accompanied by a thunderstorm, the collected rain water w...

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  3. A universal indicator is

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  4. The usefulness of a universal indicator is that

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  5. The colour of the pH strip turned red when it was dipped into a sample...

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  6. A drop of colourless liquid was placed on blue litmus paper. The litmu...

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  7. Which of the following solutions would you use test the pH of a given ...

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  8. solution of SO(2) gas in water is acidic due to the formation of

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  9. The smell of sulphur dioxide is

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  10. Crystals of ferrous sulphate when exposed to air become

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  11. In the reaction with acidified K(2)Cr(2)O(7) solution , SO(2) acts as

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  12. A colourless gas produces irritation in lungs when inhaled and gives t...

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  13. Mohr's salt is

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  14. The bleaching action of sulphur dioxide is due to

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  15. Sulphur dioxide is not recognized by

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  16. The products formed when sodium sulphite is made to react with dilute ...

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  17. When SO(2) gas is passed through an acidified solution of K(2)Cr(2)O(7...

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  18. Name the substance which is used to prepare blue-black ink

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  19. Sulphur dioxide gas is dried by passing through concentrated H(2)SO(4)...

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  20. Sulphur dioxide gas should not be inhaled directly because

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