JEE Chemical Bonding PYQs with Solutions PDF, Download

Given below are two statements:
Statement I: The correct order in terms of bond dissociation enthalpy is $$Cl_{2} > Br_{2} > F_{2} > I_{2}$$.
Statement II : The correct trend in the covalent character of the metal halides is $$[SnCl_{4} > SnCl_{2}]$$, $$[PbCl_{4}> PbCl_{2}]$$, and $$[UF_{4} > UF_{6}]$$.
In The light oh the above statements, choose the correct answer from the options given below:

The correct increasing order of C - H(A), C - 0 (B), C = O(C) and C = N (D) bonds in terms of covalent bond length is :

Among $$H_{2}S$$, $$H_{2}O$$, $$NF_{3}$$, $$NH_{3}$$ and $$CHC1_{3}$$, identify the molecule (X) with lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule (X) is :

ldentify the molecule (X) with maximum number of lone pairs of electrons (obtained using Lewis dot structure) among $$HNO_{3},H{2}SO_{4},NF_{3}\text{ and }O_{3}$$. Choose the correct bond angle made by the central atom of the molecule (X).

The formal charges on the atoms marked as (1) to (4) in the Lew is representation
of $$HNO_{3}$$ molecule respectively are

Consider the transition metal ions $$Mn^{3+}, Cr^{3+}, Fe ^{3+}$$ and $$Co^{3+}$$ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

Given below are statements about some molecules/ions.
Identify the CORRECT statements.
A The dipole moment value of $$NF_{3}$$ is higher than that of $$NH_{3}$$.
B. The dipole moment value of $$BeH_{2}$$ is zero.
C. The bond order of $$O_{2}^{2-}$$ and $$F_{2}$$ is same.
D. The formal charge on the central oxygen atom of ozone is -1 .
E. In $$NO_{2}$$, all the three atoms satisfy the octet rule, hence it is very stable.
Choose the correct answer from the options given below:

Find out the statements which are not true.
A. Resonating structures with more number of covalent bonds and lesser charge separntion are more stable.
B. In electromeric effect, an unsaturated system shows +E effect with nucleophile and -E effect with electrophile.
C. Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compotmds.
D. The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation.
E. Stability of carbanion increases with the increase in s - character of the carbon carrying the negative charge.

Choose the correct answer from the options given below:

Pair of species among the following having same bond order as well as paramagnetic character will be-

Given below are two statements:
Statement I: The number of species among $$BF_{4}^{-},SiF_{4},XeF_{4}\text{ and }SF_{4}$$,that have unequal E-F bond lengths is two. Here, E is the central atom.
Satement II: Among $$O_{2}^{-},O_{2}^{2-},F_{2}\text{ and }O_{2}^{+},O_{2}^{-}$$ has the highest bond order.
In the light of the above statements, choose the correct answer from the options given below

Which statements are NOT TRUE about $$XeO_2 F_2$$?

A. It has a see-saw shape.
B. Xe has 5 electron pairs in its valence sheU in XeO 2 F 2.
C. The $$O - Xe- O$$ bond angle is close to $$180^{o}$$.
D. The $$F- Xe -F$$ bond angle is close to $$180^{o}$$.
E. $$Xe$$ has 16 valence electrons in $$XeO_2 F_2$$.

Choose the correct answer from the options given below:

Arrange the following compounds in increasing order of their dipole moment : $$HBr,H_{2}S,NF_{3}\text{ and }CHCl_{3}$$

The maximum covalency of a non-metallic group 15 element ' E ' with weakest E-E bond is:

The number of molecules/ions that show linear geometry among the following is ______
$$ \mathrm{SO_2},\ \mathrm{BeCl_2},\ \mathrm{CO_2},\ \mathrm{N_3^-},\ \mathrm{NO_2},\ \mathrm{F_2O},\ \mathrm{XeF_2},\ \mathrm{NO_2^+},\ \mathrm{I_3^-},\ \mathrm{O_3} $$

Which of the following statement is true with respect to  $$H_2O,\ NH_3$$ and  $$CH_4?$$ $$A.$$  The central atoms of all the molecules are  $$sp^3$$  hybridized.  $$B.$$ The  $$H-O-H,\ H-N-H$$ and $$H-C-H$$ angles in the above molecules  are $$104.5^\circ,\ 107.5^\circ$$  and $$109.5^\circ$$ respectively.  $$C.$$ The increasing order of dipole moment is $$CH_4 < NH_3 < H_2O.$$ $$D.$$ Both $$H_2O$$   and $$NH_3$$ are Lewis acids and  $$CH_4$$ is a Lewis base.  $$E.$$ A solution of  $$NH_3$$ in $$H_2O$$  is basic. In this solution  $$NH_3$$ and $$H_2O$$ act as Lowry-Bronsted acid and base respectively. Choose the correct answer from the options given below:

Which of the following linear combination of atomic orbitals will lead to formation of molecular orbitals in homonuclear diatomic molecules [internuclear axis in $$z$$-direction] ? A. $$2p_z$$ and $$2p_x$$ B. 2 s and $$2p_x$$ C. 3 $$d_{xy}$$ and 3 $$d_{x^{2} - y^{2}}$$ D. 2 s and $$2p_z$$ E. $$2p_z$$ and $$3d_{x}^{2}- y^{2}$$ Choose the correct answer from the options given below:

Given below are two statements : Statement (I): Experimentally determined oxygen-oxygen bond lengths in the $$ O_3 $$ are found to be same and the bond length is greater than that of a $$O = O$$ (double bond) but less than that of a single $$(O - O)$$ bond. Statement (II) : The strong lone pair-lone pair repulsion between oxygen atoms is solely responsible for the fact that the bond length in ozone is smaller than that of a double bond $$(O = O)$$ but more than that of a single bond $$(O - O)$$. In the light of the above statements, choose the correct answer from the options given below :

The molecules having square pyramidal geometry are

Consider $$'n'$$ is the number of lone pair of electrons present in the equatorial position of the most stable structure of $$ClF_{3}$$. The ions from the following with $$'n'$$ number of unpaired electrons are $$A. V^{3+} B.Ti^{3+} C.Cu^{2+} D.Ni^{2+} E.Ti^{2+}$$ Choose the correct answer from the options given below :

Match the LIST-I with LIST-II

Choose the correct answer from the options given below:

Total number of sigma ($$\sigma$$) and pi($$\pi$$) bonds respectively present in hex-1-en-4-yne are :

Total number of non bonded electrons present in $$NO_{2}$$ -ion based on Lewis theory is

Which one of the following molecules has maximum dipole moment?

Number of molecules/ions from the following in which the central atom is involved in sp³ hybridization is: $$NO_3^-,\ BCl_3,\ ClO_2^-,\ ClO_3$$

Number of molecules/species from the following having one unpaired electron is ______. $$O_2,\ O_2^{-1},\ NO,\ CN^{-1},\ O_2^{2-}$$

Total number of molecules/species from following which will be paramagnetic is ______
$$O_{2},O_2^+,O_2^-,NO,NO_{2},CO,K_{2}[NiCl_{4}],[Co(NH_{3})_{6}]Cl_{3},K_{2}[Ni(CN)_{4}]$$

Arrange the bonds in order of increasing ionic character in the molecules: $$LiF$$, $$K_2O$$, $$N_2$$, $$SO_2$$ and $$ClF_3$$.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: $$PH_3$$ has lower boiling point than $$NH_3$$. Reason R: In liquid state $$NH_3$$ molecules are associated through Vander Waal's forces, but $$PH_3$$ molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below:

The number of molecules/ion/s having trigonal bipyramidal shape is: $$PF_5$$, $$BrF_5$$, $$PCl_5$$, $$[PtCl_4]^{2-}$$, $$BF_3$$, $$Fe(CO)_5$$

Given below are two statements:
Statement (I): A $$\pi$$ bonding MO has lower electron density above and below the inter-nuclear axis.
Statement (II): The $$\pi^*$$ antibonding MO has a node between the nuclei.
In light of the above statements, choose the most appropriate answer from the options given below:

Select the compound from the following that will show intramolecular hydrogen bonding.

Choose the polar molecule from the following :

Sum of bond order of CO and $$NO^+$$ is _______.

The number of non-polar molecules from the following is
$$HF, H_2O, SO_2, H_2, CO_2, CH_4, NH_3, HCl, CHCl_3, BF_3$$

Number of compounds with one lone pair of electrons on central atom amongst following is _______
$$O_3, H_2O, SF_4, ClF_3, NH_3, BrF_5, XeF_4$$

The number of species from the following which are paramagnetic and with bond order equal to one is _______
$$H_2, He_2^+, O_2^+, N_2^{2-}, O_2^{2-}, F_2, Ne_2^+, B_2$$

The total number of molecules with zero dipole moment among $$CH_4, BF_3, H_2O, HF, NH_3, CO_2$$ and $$SO_2$$ is ______.

The total number of anti bonding molecular orbitals, formed from $$2s$$ and $$2p$$ atomic orbitals in a diatomic molecule is ______.

The total number of molecular orbitals formed from $$2s$$ and $$2p$$ atomic orbitals of a diatomic molecule is _______.

Given below are two statements:
Statement-I: Since fluorine is more electronegative than nitrogen, the net dipole moment of $$NF_3$$ is greater than $$NH_3$$.
Statement-II: In $$NH_3$$, the orbital dipole due to lone pair and the dipole moment of NH bonds are in opposite direction, but in $$NF_3$$ the orbital dipole due to lone pair and dipole moments of N-F bonds are in same direction.
In the light of the above statements, choose the most appropriate from the options given below.

The molecule/ion with square pyramidal shape is:

The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals A. have the same energy B. have the minimum overlap C. have same symmetry about the molecular axis D. have different symmetry about the molecular axis. Choose the most appropriate from the options given below:

The number of species from the following in which the central atom uses $$sp^3$$ hybrid orbitals in its bonding is _________. $$NH_3, SO_2, SiO_2, BeCl_2, CO_2, H_2O, CH_4, BF_3$$

Which of the following is least ionic?

A diatomic molecule has a dipole moment of 1.2 D. If the bond distance is 1 $$\mathring{A}$$, then fractional charge on each atom is ______ $$\times 10^{-1}$$ esu. (Given 1D = $$10^{-18}$$ esu cm)

The correct statement/s about Hydrogen bonding is/are: A. Hydrogen bonding exists when H is covalently bonded to the highly electronegative atom. B. Intermolecular H bonding is present in o-nitrophenol. C. Intramolecular H bonding is present in HF. D. The magnitude of H bonding depends on the physical state of the compound. E. H-bonding has powerful effect on the structure and properties of compounds. Choose the correct answer from the options given below:

The number of species from the following that have pyramidal geometry around the central atom is _______. $$S_2O_3^{2-}$$, $$SO_4^{2-}$$, $$SO_3^{2-}$$, $$S_2O_7^{2-}$$

Number of compounds/species from the following with non-zero dipole moment is ______. $$BeCl_2, BCl_3, NF_3, XeF_4, CCl_4, H_2O, H_2S, HBr, CO_2, H_2, HCl$$

Match List I with List II :

Choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : $$NH_3$$ and $$NF_3$$ molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of $$NH_3$$ is greater than that of $$NF_3$$. Reason (R) : In $$NH_3$$, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the $$N-H$$ bonds. $$F$$ is the most electronegative element. In the light of the above statements, choose the correct answer from the options given below :