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प्रश्न
Arrange the following in the order of property indicated for the given set:
HF, HCl, HBr, HI - increasing acid strength.
Arrange the following according to the property mentioned against the given:
HF, HCI, HI, HBr in the order of increasing acid strength.
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उत्तर १
HF < HCl < HBr < HI
The bond dissociation energy of the H-X molecules, where X=F, Cl, Br, and I, decreases with an increase in the atomic size. Since the H-I bond is the weakest, HI is the strongest acid.
उत्तर २
The acid strength of HF, HCl, HBr and HI depends upon their bond dissociation enthalpies. Since the bond dissociation enthalpy of the H-X bond decreases from H-F to H-I as the size of the atom increases from F to I.
Thus, the acid strength order is HF < HCl < HBr < HI
The weak acidic strength of HF is also due to H-bonding, due to which the release of H+ becomes difficult.
संबंधित प्रश्न
Account for the following: Fluorine does not exhibit positive oxidation state.
Fluorine is a stronger oxidising agent than chlorine. Why?
Account for the following :
Acidic character increases from HF to HI.
Which halogen compound in the following pair will react faster in SN2 reaction CH3Br or CH3I.
Which halogen compound in each of the following pairs will react faster in SN2 reaction
(CH3)3 C – Cl or CH3 – Cl
Give two examples to show the anomalous behaviour of fluorine.
Write two uses of ClO2.
Write the reactions of F2 with water.
Which one has the lowest boiling point?
The set with the correct order of acidity is:
Which of the following pairs of ions are isoelectronic and isostructural?
Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.
| Ion | \[\ce{CIO^{-}_{4}}\] | \[\ce{IO^{-}_{4}}\] | \[\ce{BrO^{-}_{4}}\] |
| Reduction potential EΘ/V |
EΘ = 1.19 V | EΘ = 1.65V | EΘ = 1.74 V |
Which of the following statements are true?
(i) Only type of interactions between particles of noble gases are due to weak dispersion forces.
(ii) Ionisation enthalpy of molecular oxygen is very close to that of xenon.
(iii) Hydrolysis of XeF6 is a redox reaction.
(iv) Xenon fluorides are not reactive.
The reaction \[\ce{3ClO- (aq) -> ClO3- (aq) + 2Cl- (aq) + 2Cl- (aq)}\] is an example of
Write the name and formula of oxoacid of fluorine.
