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Standard XII

Chemistry

Anomalous Behaviour of Fluorine

The most reac...

Question

The most reactive elements in the halogen group is __________.

Astatine

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Iodine

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Chlorine

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Fluorine

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Solution

The correct option is D Fluorine
Flourine is the most reactive element in the halogen group.
This is because it has the smallest radius and most electronegative character.

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Similar questions

Q. The first

(Δ_{i} H_{1})

and the second

(Δ_{i} H_{2})

ionization enthalpies (in kJ mol

^{- 1}

) and the

(Δ_{e g} H)

electron gain enthalpy (in kJ mol

^{- 1}

) of a few elements are given below:

Elements	$Δ H_{1}$	$Δ H_{2}$	$Δ_{e g}$ H
I	520	7300	-60
II	419	3051	-48
III	1681	3374	-328
IV	1008	1846	-295
V	2372	5251	+48
VI	738	1451	-40

Which of the above elements is likely to be :
(a) the least reactive element,
(b) the most reactive metal,
(c) the most reactive non-metal,
(d) the least reactive non-metal,
(e) the metal which can form a stable binary halide of the formula MX

_{2}

(X=halogen) and
(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

The first (Δ_iH1) and the second (Δ_iH) ionization enthalpies (in kJ mol^–1) and the (Δ_egH) electron gain enthalpy (in kJ mol^–1) of a few elements are given below:

Elements	Δ_iH	Δ_iH	Δ_egH
I	520	7300	–60
II	419	3051	–48
III	1681	3374	–328
IV	1008	1846	–295
V	2372	5251	+48
VI	738	1451	–40

Which of the above elements is likely to be :

(a) the least reactive element.

(b) the most reactive metal.

(d) the least reactive non-metal.

(e) the metal which can form a stable binary halide of the formula MX₂, (X=halogen).

(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

Q. What happens in a displacement reaction?

(a) A more reactive element replaces a less reactive element.
(b) A less reactive element replaces a more reactive element.
(c) An element replaces one which is equally reactive.
(d) Any element can replace any other element with no relation to reactivity.

Q. The position of three elements A, B and C in the Periodic Table are shown below-

Group $16$	Group $17$
-	-
-	A
-	-
B	C

(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?

Q. Three elements A,B and C have atomic number 7,8 and 9 respectively.What would be their positions in the modern periodic table mention group and period.Arrange A,B and C in the decreasing order of their size.Which one of the three elements is most reactive and why?

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The most reactive elements in the halogen group is __________.

The correct option is D FluorineFlourine is the most reactive element in the halogen group. This is because it has the smallest radius and most electronegative character.

The correct option is D Fluorine
Flourine is the most reactive element in the halogen group.
This is because it has the smallest radius and most electronegative character.