EASY
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The correct order of electron affinity is-
(a)
(b)
(c)
(d)

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Important Questions on Classification of Elements and Periodicity in Properties
EASY
The species and contain the same number of electrons. In which order do their radii increase?

EASY
The correct order of atomic radii is:

EASY
The absolute value of the electron gain enthalpy of halogens satisfies:

MEDIUM
The correct order of first electron affinity of and is

EASY
The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na + will be :

EASY
The element with maximum bond-energy

MEDIUM
The first electron affinity of and will be of the order

MEDIUM
In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

EASY
Within each pair of elements and , and , and and , respectively, the elements that release more energy upon an electron gain are

MEDIUM
Which of the following reactions does not involve absorption of energy?
I.
II.
III.
IV.

EASY
What is the correct oder of electron gain enthalpy of

EASY
Identify the element that forms amphoteric oxide:

HARD
In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?
(A) and
(B) and
(C) and
(D) and
Choose the correct answer from the options given below:

MEDIUM
Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements?
a. Nitrogen
b. Phosphorous
c. Chlorine
d. Fluorine

MEDIUM
The ionic radii of and are respectively:

EASY
The first ionization enthalpies for three elements are and , respectively. The correct sequence of the element is:

MEDIUM
Which of the following represents the correct order of increasing first ionization enthalpy for ?

EASY
Which of the following elements has the most negative electron gain enthalpy?

EASY
When the first electron gain enthalpy of oxygen is , its second electron gain enthalpy is:

EASY
The first ionization enthalpies of and follow the order

