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Phenolphthalein shows colour change in a...

Phenolphthalein shows colour change in a definite pH range, which is-

A

5.5-7.4

B

4.5-6.5

C

8.3-6.5

D

8.3-10.5

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The correct Answer is:
D
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(A ) : When Na_(2)CO_(3) is titrated against HCl in presence of phenolphthalein indicator, it is converted into NaCl. (R ) : Phenolphthalein indicator shows colour change in the P^(H) range of 3.5 to 4.6

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pH range of colour change for methyl orange indicator is-

During the neutralisation of an acid by a base, the end point refers to the completion of reaction. The detection of end point in acid-base neutralisation is usually made by an acid-base indicator. An acid-base indicator is itself a weak acid (Phenolphthalein) or a weak base (Methyl orange). At 50% ionisation which depends on the medium. the anion furnished by an indicator (acid) cation furnished colour to solution at end point. For example, phenolphthalein dissociation underset("Colourless")(HIn)toH^(+)+underset("Pink")(In^(-)),K_(HIn)=([H^(+)][In^(-)])/([HIn]) is favoured in presence of alkali and pink colour of phenolphthalein ion is noticed as soon as the medium changes to alkali nature. The end point of acid-base neutralisation not necessarily coincides with eqivalence point but it is closer to equivalence point. Also at equivalence point of acid-base neutralisation, pH is not necessarily equal to 7. Which among the followig statements are correct? (P) At equivalence point of NaOH AND HCI,pH=7 (Q) At equivalence point of NaOH and CH_(3)COOH,pH gt 7 (R) At equivalence point of NH_(4)OH and HCI,pH lt 7 (S) An indicator shows best results if equivalence point is within the pH range pK_(In)pm1 (T) ) At equivalence point of NH_(4)OH and formic acid pH lt 7

MOTION-IONIC EQUILIBRUIM-Exercise -1
  1. Which of the following will produce a buffer sollution when mixed in e...

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  2. The pH of buffer of NH4OH + NH4Cl - type is given by -

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  3. A buffer solution can be prepared by mixing solution of:

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  4. Which one of the following mixture does not act as a buffer solution?

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  5. In the neutralization process of H3PO4 and NaOH, the number of buffers...

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  6. H(2)CO(3)+NaHCO(3) found in blood helps in maintaining pH of the blood...

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  7. pH range of colour change for methyl orange indicator is-

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  8. The colour of phenolphthalein in acid is-

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  9. Methyl orange is an example of :

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  10. Phenolphthalein is-

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  11. According to Modern quinoid theory the indicator used in acid-alkali t...

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  12. Phenolphthalein shows colour change in a definite pH range, which is-

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  13. If s is the molar solubility of Ag2SO4, then

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  14. Which of the following would increase the solubility of Pb(OH)(2)?

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  15. The aqueous solution of which of the following sulphides would contain...

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  16. Which of the following has the maximum solubility in water?

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  17. The necessary condition for saturated solution is –

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  18. At 30^(@) C the solubility of Ag(2)CO(3) (K(SP)=8xx10^(-12)) would be ...

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  19. Which of the following expressions shows the saturated solution of PbS...

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  20. The correct relation between Ksp and solubility for the salt KAI(SO(4)...

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