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Which of the following statement is (ar...

Which of the following statement is (are) not correct ?

A

Every indicator changes its colour in a definte pH range

B

The pH range of litmus is 5.0 -8.0

C

The quinonoid form of an indicator is usually colourless or of light colour

D

Undissociated methyl orange molecule is yellow.

Text Solution

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The correct Answer is:
C
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ICSE-EQUILIBRIUM -OBJECTIVE (MULTIPLE CHOICE ) TYPE QUESTIONS
  1. The conjugate acid of HPO(4)^(2-) is:

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  2. Which of the following is not Lewis acid ?

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  3. Which of the following statement is (are) not correct ?

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  4. The best indicator for the detection of end point in titration of a we...

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  5. The blue litmus is turned red by an aqueous solution of

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  6. The aqueous solution (s) of which of the following salts is (are) acid...

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  7. The aqueous solution of CH3COONa is alkaline due to interaction of...

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  8. The aqueous solution of CH3COONH4 is neutral because

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  9. Hydrolysis is the reverse process of

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  10. The aqueous solution of Na2SO4 is neutral because

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  11. The aqueous solution of FeCl3 is

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  12. If a solution has of a pOH value of 14 at 25^(@)C , H^(+) ion con...

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  13. The solubility of A2X3 is y mol dm^(-3) Its solubility product is

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  14. If pKb for fluoride ion at 25 ^(@) C is 10.83 the ionisation consta...

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  15. Which of the following statement is correct?

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  16. The pH of 0.1 M solution of the following salts increases in the orde...

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  17. A buffer solution cannot be prepared from a mixture of

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  18. For a sparingly soluble salt ApBq, the relationship of its solubility...

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  19. One of the following species acts as both Bronsted acid and base

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  20. An aqueous solution of 1M NaCl and 1M HCl is

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