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Which of the ...

Question

Which of the following statement is not true for halogens?

A

All form monobasic oxyacids.

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B

All but fluorine show positive oxidation states.

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C

All are oxidizing agents.

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D

Chlorine has the highest electron-gain enthalpy.

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Solution

The correct option is B All form monobasic oxyacids.
Fluorine shows only $1$ oxidation state and other halogen shows negative and positive oxidation state. Due to high electronegativity and small size only F form one oxoacid that is HOF.
Hence A is correct option because A is not true statement.

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Similar questions

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

Which of the following oxyacids of Chlorine is the strongest oxidizing agent?

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. 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}

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

Which of the following statements are correct?
(a) Helium has the highest first ionisation enthalpy in the periodic table
(b) Chlorine has less negative electron gain enthalpy than fluorine
(c) Mercury and bromine are liquids at liquids at room temperature
(d) In any period, the atomic radius of alkali metal is the highest

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