JEE Main · 2026 · 05 Apr 2026 · Shift 2 · Classification of Elements and Periodicity

Given below are two statements :

Statement-I : The number of pairs among

[Al_{2} O_{3}, Cr_{2} O_{3}], [Cl_{2} O_{7}, Mn_{2} O_{7}], [Na_{2} O, V_{2} O_{3}]

and

[CO, N_{2} O]

that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4.

Statement-II : Among

Na_{2} O, Al_{2} O_{3}, CO

and

Cl_{2} O_{7}

, the most basic and acidic oxides are

Na_{2} O

and

Cl_{2} O_{7}

, respectively.
In the light of the above statements, choose the correct answer from the options given below :

Answer: (A)

Solution

Classifying each pair by the nature of its oxides:

A l_{2} O_{3}

and

C r_{2} O_{3}

are both amphoteric;

C l_{2} O_{7}

and

M n_{2} O_{7}

are both acidic (highest oxidation-state oxides);

N a_{2} O

and

V_{2} O_{3}

are both basic (low oxidation-state metal oxides); and

CO

and

N_{2} O

are both neutral. All four pairs contain oxides of the same nature, so the stated count of 4 is correct and Statement-I is true. Among

N a_{2} O

A l_{2} O_{3}

CO

and

C l_{2} O_{7}

, basic character is greatest for the alkali-metal oxide

N a_{2} O

and acidic character is greatest for the non-metal highest oxide

C l_{2} O_{7}

, so Statement-II is true. Both Statement-I and Statement-II are true.

JEE Main · 2026 · 05 Apr 2026 · Shift 2 · Single correct option