Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Periodic Table and Periodicity question

2022 · 24 Jun · Shift 1 · Q5
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /Periodic Table and Periodicity
  5. /2022 · 24 Jun · Shift 1 · Q5

Periodic Table and Periodicity question

2022 · 24 Jun · Shift 1 · Q5

JEE MainChemistryPeriodic Table and PeriodicityMCQ+4 / −1
Given below are the oxides: Na2ONa_2ONa2​O, As2O3As_2O_3As2​O3​, N2ON_2ON2​O, NONONO and Cl2O7Cl_2O_7Cl2​O7​ Number of amphoteric oxides is :
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3
View written solutionFree

Correct answer: B

  1. Classify each oxide by acid-base behavior

We analyze the given oxides one by one:

  • Na2ONa_2ONa2​O
  • As2O3As_2O_3As2​O3​
  • N2ON_2ON2​O
  • NONONO
  • Cl2O7Cl_2O_7Cl2​O7​
  1. Na2ONa_2ONa2​O

Na2ONa_2ONa2​O is an oxide of an alkali metal. Alkali metal oxides are basic oxides.

Na2O+H2O→2NaOHNa_2O + H_2O \rightarrow 2NaOHNa2​O+H2​O→2NaOH

So, Na2ONa_2ONa2​O is basic, not amphoteric.

  1. As2O3As_2O_3As2​O3​

As2O3As_2O_3As2​O3​ (arsenious oxide) shows both acidic and basic character, so it is amphoteric.

It can react with acids as well as with bases.

Hence, As2O3As_2O_3As2​O3​ is amphoteric.

  1. N2ON_2ON2​O

N2ON_2ON2​O is a neutral oxide. It is neither acidic nor basic.

So, N2ON_2ON2​O is not amphoteric.

  1. NONONO

NONONO is also a neutral oxide.

So, NONONO is not amphoteric.

  1. Cl2O7Cl_2O_7Cl2​O7​

Cl2O7Cl_2O_7Cl2​O7​ is the anhydride of perchloric acid:

Cl2O7+H2O→2HClO4Cl_2O_7 + H_2O \rightarrow 2HClO_4Cl2​O7​+H2​O→2HClO4​

Thus, it is a strongly acidic oxide, not amphoteric.

  1. Count amphoteric oxides

Only As2O3As_2O_3As2​O3​ is amphoteric.

Therefore, the number of amphoteric oxides = 1.

  1. Compare with options
  • A: 000
  • B: 111 ✅
  • C: 222
  • D: 333

So, the correct option is B.

PreviousNext

More from Periodic Table and Periodicity

  • The IUPAC nomenclature of an element with electronic configuration [Rn] 5f146d17s2 is :2022 · MCQ
  • The first ionization enthalpies of Be, B, N and O follow the order2022 · MCQ
  • The correct order of electron gain enthalpies of Cl, F, Te and Po is2022 · MCQ
  • Given two statements below : Statement I : In Cl2​ molecule the covalent radius is double of the atomic radius of chlorine. Statement II : Radius of anionic species is always greater than their parent atomic radius. Choose the…2022 · MCQ
  • The incorrect statement is2022 · MCQ
  • Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The ionic radii of O2− and Mg2+ are same. Reason (R) : Both O2− and Mg2+ are isoelectronic…2022 · MCQ
  • The correct order of increasing ionic radii is2022 · MCQ
  • In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical? (A) Rb and Cs (B) Na and K (C) Ar and Kr (D) I and At Choose the correct answer from the options given below :2022 · MCQ