Home
Class 11
CHEMISTRY
For a diprotic acid, which of the follow...

For a diprotic acid, which of the following is true for `1^(st)` and `2^(nd)` ionization constants (`K_(a_(1))` and `K_(a_(2))`)

A

`K_(a_(1)) =K_(a_(2))`

B

`K_(a_(1)) gtK_(a_(2))`

C

`K_(a_(2))gt K_(a_(1))`

D

`K_(a_(2)) ge K_(a_(1))`

Text Solution

Verified by Experts

The correct Answer is:
B
`K_(a_(1))gtK_(a_(2)`
The reason for this is that it is more difficult to remove a positively charged proton from a negative ion due to electrostatic forces. For e.g., `H_(2)X_((aq)) overset (K_(a_(1))) hArr H_((aq))^(+) + HX_((aq))^(-)`
`HX_((aq))^(-) overset (K_(a_(2))) hArrH_((aq))^(+)+X_((aq))^(2-)`
Promotional Banner

Topper's Solved these Questions

  • IONIC EQUILIBRIUM

    ERRORLESS|Exercise NCERT BASED QUESTIONS (ACIDS AND BASES)|78 Videos

  • IONIC EQUILIBRIUM

    ERRORLESS|Exercise NCERT BASED QUESTIONS (COMMON ION EFFECT, ISOHYDRIC SOLUTIONS, SOLUBILITY PRODUCT, IONIC PRODUCT OF WATER AND SALT HYDROLYSIS)|59 Videos

  • HYDROGEN

    ERRORLESS|Exercise ASSERTION & REASON|6 Videos

  • PURIFICATION, CLASSIFICATION AND NOMENCLATURE OF ORGANIC COMPOUNDS

    ERRORLESS|Exercise ASSERTION & REASON|9 Videos

Similar Questions

Explore conceptually related problems

For every diprotic acid of the type H_(2)X , how would you relate ionisation constant K_(a1) and K_(a2)

In a solution containing 0.1M HCl & 0.1M H_(3)PO_(4) (having dissociation constants K_(a_(1)),K_(a_(2)),K_(a_(3))) assuming alphaltlt1 for H_(3)PO_(4) ,

Assertion : Acids that have more than one proton that can be donated to base are called polyrotic acids. Reason : For all diprotic acids, the equilibrium constant K_(a_(2)) for the second stage of ionisation is smaller than the equilibrium constant, K_(a_(1)) , for the first stage of ionisation.

Write the order of K_(a_(1)) values of following acids :

A certain endothermic reaction: Ararr Product, DeltaH=+ve proceeds in a sequence of three elementary steps with the rate constants K_(1), K_(2) and K_(3) and each one having energy of activation E_(a), E_(2) and E_(3) respectively at 25^(@)C . The observed rate constant for the reaction is equal to K_(3) sqrt(K_(1)/K_(2)). A_(1), A_(2) and A_(3) are Arrhenius parameters respectively. Which represents the correct value, if catalyst is not present?