JEE Main · 2023 · 25 Jan 2023 · Shift 2 · Classification of Elements and Periodicity

Which one among the following metals is the weakest reducing agent ?

(A)K
(B)Rb
(C)Na✓ Correct
(D)Li

Answer: (C)

Solution

The reducing strength of a metal in water is set by its standard oxidation potential, the strongest reducer having the most negative standard reduction potential. Lithium, with the most negative value, is the strongest, followed by rubidium and then potassium, while sodium has the least negative value of the four. Having the smallest tendency to be oxidised, sodium is the weakest reducing agent.

JEE Main · 2023 · 25 Jan 2023 · Shift 2 · Single correct option

Practise more: all JEE Main PYQs on Classification of Elements and Periodicity →

More JEE Main questions on Classification of Elements and Periodicity

Which of the following represents the correct trend for the mentioned property?
A. $F > P > S > B$ - First Ionization Energy
B. $Cl > F > S > P$ - Electron Affinity
C. …
JEE Main 2026View solution →
Given below are two statements:

Statement-I: The correct order in terms of atomic/ionic radii is $Al > Mg > Mg^{2 +} > Al^{3 +}$ .

Statement-II: The correct order in terms of the magnitude of electron gain enthalpy is …
JEE Main 2026View solution →
Given below are two statements :

Statement-I : The first ionization enthalpy of Cr is lower than that of Mn.
Statement-II : The second and third ionization enthalpies of Cr are higher than those of Mn .

In the light of the above statements, choose the correct answer from the op …
JEE Main 2026View solution →
Given below are two statements :

Statement-I : $C < O < N < F$ is the correct order in terms of first ionization enthalpy values.

Statement-II : $S > Se > Te > Po > O$ is the correct order in terms of the ma …
JEE Main 2026View solution →
The correct trend in the first ionization enthalpies of the elements in the $3^{rd}$ period of periodic table is:
JEE Main 2026View solution →
The correct statements from the following are :
(A) Ionic radii of trivalent cations of group 13 elements decreases down the group.
(B) Electronegativity of group 13 elements decreases down the group.
(C) Among the group 13 elements, Boron has highest first ionisation enthalpy.
( …
JEE Main 2026View solution →