JEE Mains · Chemistry · STD 11 - 4. Chemical bonding and molecular structure
Among the following molecules / ions \(C_2^{2-} ,N_2^{2-} ,O_2^{2-},O_2\) which one is diamagnetic and has the shortest bond length ?
- A \(O_2^{2-}\)
- B \(C_2^{2-}\)
- C \(O_2\)
- D \(N_2^{2-}\)
Answer & Solution
Correct Answer
(B) \(C_2^{2-}\)
Step-by-step Solution
Detailed explanation
\(C_2^{2 - } - {\sigma _{1s}}2{\sigma ^*}_{1s}2{\sigma _{2s}}2{\sigma ^*}_{2{s^2}}[{\pi _{2p_x^2}} = {\pi _2}p_y^2]{\sigma _{2p_z^2}}\) \(B.O = \frac{{10 - 4}}{2} = 3\) (diamagnetic)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?JEE Mains 2017 Hard
- Which of the following statement(s) is/are true ?
A. If two orbitals have the same value of \((n + l)\), the orbital with lower value of \(n\) will have lower energy.
B. Energies of the orbitals in the same subshell increase with increase in atomic number.
C. The size of \(2p_x\) orbital is less than the size of \(3p_x\) orbital.
D. Among \(5f\), \(6s\), \(4d\), \(5p\) and \(5d\) orbitals, none of the orbitals have \(2\) radial nodes.
Choose the correct answer from the options given below :JEE Mains 2026 Medium - The spin-only magnetic moment value of \(\mathrm{B}_{2}^{+}\) species is \(......\,\times 10^{-2} \,\mathrm{BM}\). (Nearest integer) [Given : \(\sqrt{3}=1.73\) ]JEE Mains 2021 Hard
- The correct order for acid strength of compounds \(CH \equiv CH,\,C{H_3} - C \equiv CH,\,C{H_2} = C{H_2}\) is as followsJEE Mains 2019 Medium
- Given below are two statements :
Statement-I: Sublimation is used for the separation and purification of compounds with low melting point.
Statement-II: The Boiling point of a liquid increases as the external pressure is reduced.
In the light of the above statements, choose the correct answer from the options given below :JEE Mains 2026 Medium - In the given structure, number of sp and \(\mathrm{sp}^2\) hybridized carbon atoms present respectively are :
JEE Mains 2025 Easy
More PYQs from JEE Mains
- A vector \(\vec{a}\) is parallel to the line of intersection of the plane determined by the vectors \(\hat{i}, \hat{i}+\hat{j}\) and the plane determined by the vectors \(\hat{i}-\hat{j}, \hat{i}+\hat{k}\). The obtuse angle between \(\vec{a}\) and the vector \(\vec{b}=\hat{i}-2 \hat{j}+2 \hat{k}\) isJEE Mains 2022 Hard
- \(\int \limits_{6}^{16} \frac{\log _{\mathrm{e}} x^{2}}{\log _{e} x^{2}+\log _{e}\left(x^{2}-44 x+484\right)} d x\) is equal to:JEE Mains 2021 Medium
- Let a and β be the roots of equation \( x^{2}+2ax+(3a+10) = 0 \) such that \( \alpha<1<\beta \) Then the set of all possible values of a is :JEE Mains 2026 Medium
- Given below are two statements:
Statement I:
can be synthesized from 
using simpler reagents in the order i) Acidic \(KMnO _4\), ii) Ammonia, iii) Bromine and alkali
Statement II :
can be converted into 
using reagents in the order (i) Bromine- \(H _2 O\) (ii) \(NaNO _2 / HCl \left(0-5^{\circ} C \right)\) (iii) aq. \(H _3 PO _2\).
In the light of the above statements, choose the correct answer from the options given belowJEE Mains 2026 Easy - Three persons \(P, Q\) and \(R\) independently try to hit a target . If the probabilities of their hitting the target are \(\frac{3}{4},\frac{1}{2}\) and \(\frac{5}{8}\) respectively, then the probability that the target is hit by \(P\) or \(Q\) but not by \(R\) isJEE Mains 2017 Hard
- Let \(A(a, b), B(3,4)\) and \((-6,-8)\) respectively denote the centroid, circumcentre and orthocentre of a triangle. Then, the distance of the point \(P(2 a+3,7 b+5)\) from the line \(2 x+3 y-4=0\) measured parallel to the line \(x-2 y-1=0\) isJEE Mains 2024 Hard