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Anomalous Behaviour of Fluorine

Which of the ...

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Which of the following statement is not true for halogens ? 1) All form monobasic oxyacids. 2) All are oxidizing agents. 3) All but fluorine show positive oxidation states. 4) Chlorine has the highest electron gain enthalpy.

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Which of the following statement is not true for halogens

1)chlorine has highest electron gain enthalphy

2)all forms monobasic oxyacids

3)all but flourine shows positive oxidation states

4)all are oxidising agents

Q. Explain the following:
(i) Gallium has higher ionization enthalpy than aluminum.
(ii) Boron does not exist as

B^{3 +}

ion.
(iii) Aluminum forms

[A l F_{6}]^{3 -}

ion but boron does not form

[B F_{6}]^{3 -}

P b X_{2}

is more stable than

P b X_{4}

P b^{4 +}

acts as an oxidizing agent, but

S n^{2 +}

acts as a reducing agent.
(vi) Electron gain enthalpy of chlorine is more negative as compared to fluorine.
(vii)

T I (N O_{3})_{3}

acts as an oxidizing agent.
(viii) Carbon shows catenation property but lead does not.
(ix)

B F_{3}

does not hydrolyze.
(x) Why does the element silicon, not form a graphite-like structure whereas carbon does?

Q. Give reasons for the following :
(i) Though nitrogen exhibits +5 oxidation state, it does not form pentahalide.
(ii) Electron gain enthalpy with negative sign of fluorine is less than that of chlorine.
(iii) The two oxygen-oxygen bond lengths in ozone molecule are identical.

Q. In spite of having less electron affinity than chlorine, fluorine is the strongest oxidizing agent among the halogens, The most important reason for this phenomenon is :

Q. The high reactivity of fluorine is due to its _____ dissociation energy. Its shows only ______ oxidation state. It has_______electron affinity than chlorine. Among all hydrogen halides boiling point is highest for_______.

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