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Acidic character increases from HF to HI...

Acidic character increases from HF to HI Account for this.

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The relative acidic strength of HF, HCI, HBr and HI depends upon their bond dissociation enthalpies. Since, the bond dissociation enthalpy of H-X bond decreases from H-F to H-I as the size of atom increases from F to I. Therefore, the acidic strength increases in opposite order as: `H-F lt H- Cl lt H- Br lt H-I`
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ARIHANT PUBLICATION-GROUP 17 ELEMENTS : HALOGEN FAMILY-QUESTIONS FOR PRACTICE (Very Short Answer Type Questions)
  1. Which of the following elements does not show positive oxidation state...

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  2. Which hydracid of halogen has the highest bond energy?

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  3. Acidic character increases from HF to HI Account for this.

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  4. Concentrated hydrogen fluoride exists in the molecular formula of .......

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  5. Arrange the following in order of increasing size: Cl, Cl^+ , Cl^-

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  6. F(2) has lower bond dissociation enthalpy than Cl(2). Why?

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  7. Explain why halogens are strong oxidising agents.

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  8. SnCl(4) is more covalent than SnCl(2).

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  9. What is the oxidation number of oxygen in OF(2)?

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  10. Give two examples to show the anomalous behaviour of fluorine.

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  11. Why hydrofluoric acid is the weakest of all the halogen acids ?

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  12. Which acid is used to draw picture on glass?

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  13. What happens when fluorine is passed through conc. NaOH solution?

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  14. What happens when chlorine gas is passed through cold solution of NaOH...

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  15. Give the reason for bleaching action of Cl(2).

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  16. Name two poisonous gases which can be prepared from chlorine gas.

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  17. What is the role of MnO2 in the preparation of Cl2 from HCI?

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  18. Account for the following. Iron on reaction with HCl forms FeCl(2) and...

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  19. Why is ICl more reactive than I(2)?

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  20. Give reason for the following: F(2) is more reactive than ClF(3) b...

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