p-Block Elements Previous Year Questions — NEET Chemistry

2 past-year p-Block Elements questions from NEET (Chemistry).

Q62 (2024)

Identify the incorrect statement from the following:
  1. (1) Carbon has the ability to form $p\pi-p\pi$ multiple bond with itself.
  2. (2) $ECl_3$ ($E = B$ and $Al$) is a monomer when $E = B$ and a dimer when $E = Al$.
  3. (3) Oxygen exhibits only -2 oxidation state.
  4. (4) The order of catenation property of Group 14 elements is $C \gg Si > Ge \approx Sn$.
### Related Formula $$\text{Oxidation states of Oxygen: } O_2 (0), OF_2 (+2), O_2F_2 (+1), H_2O_2 (-1), H_2O (-2)$$ ### Core Logic Statement (3) is incorrect because oxygen exhibits oxidation states of $0$ in $O_2$, $+2$ in $OF_2$, $+1$ in $O_2F_2$, and $-1$ in peroxides. ### Step 1: Conclusion Incorrect statement is (3). ### Pattern Recognition Oxygen shows positive oxidation states with fluoride ($OF_2, O_2F_2$) and -1 state in peroxides. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: p-Block Elements

Q67 (2024)

Identify the incorrect statement from the following:
  1. (1) $P(C_2H_5)_3$ and $As(C_6H_5)_3$ form $d\pi-d\pi$ bond with transition metals.
  2. (2) Nitrogen can form $d\pi-p\pi$ bond with oxygen.
  3. (3) Nitrogen can form $p\pi-p\pi$ multiple bonds with itself.
  4. (4) Phosphorus, arsenic and antimony show catenation property.
### Related Formula $$\text{Nitrogen electronic configuration: } 1s^2 2s^2 2p^3 \quad (\text{No vacant } d\text{-orbitals})$$ ### Core Logic Nitrogen lacks vacant $d$-orbitals in its valence shell ($n=2$). Therefore, it cannot form $d\pi-p\pi$ or $d\pi-d\pi$ bonds. Statement (2) is incorrect. ### Step 1: Conclusion Incorrect statement is (2). ### Pattern Recognition Second period elements ($N, O, F$) cannot form $d\pi$ bonds due to non-availability of d orbitals. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Chemistry: p-Block Elements
Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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