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Standard XII
Chemistry
Question

The most reactive elements in the halogen group is __________.
  1. Chlorine
  2. Astatine
  3. Iodine
  4. Fluorine

A
Iodine
B
Fluorine
C
Chlorine
D
Astatine
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Solution
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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
Q1
The most reactive elements in the halogen group is __________.
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Q2
The first (ΔiH1) and the second (ΔiH2) ionization enthalpies (in kJ mol−1) and the (ΔegH) electron gain enthalpy (in kJ mol−1) of a few elements are given below:
ElementsΔH1ΔH2ΔegH
I5207300-60
II4193051-48
III16813374-328
IV10081846-295
V23725251+48
VI7381451-40
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 MX2 (X=halogen) and
(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?
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Q3

The first (ΔiH1) and the second (ΔiH) ionization enthalpies (in kJ mol–1) and the (ΔegH) electron gain enthalpy (in kJ mol–1) of a few elements are given below:

Elements ΔiH ΔiH ΔegH
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 MX2, (X=halogen).

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

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Q4
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.
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Q5
The position of three elements A, B and C in the Periodic Table are shown below-
Group 16 Group17
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-A
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BC
(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?
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