Chemical Bonding · JEE Main previous year questions

Find the correct statements related to group 15 hydrides. A. Reducing nature increases from $\mathrm{N}{\mathrm{H}}_3$ to $\mathrm{Bi}{\mathrm{H}}_3$ B. Tendency to donate lone pair of electrons decreases from $\mathrm{N}{\mathrm{H}}_3$ to $\mathrm{Bi}{\mathrm{H}}_3$ C. The stability of hydrides decreases from $\mathrm{N}{\mathrm{H}}_3$ to $\mathrm{Bi}{\mathrm{H}}_3$ D. HEH bond angle decreases from $\mathrm{N}{\mathrm{H}}_3$ to $\mathrm{Sb}{\mathrm{H}}_3$ ($\mathrm{E}=\text{Elements of group 15}$) Choose the correct answer from the options given below :

1. A.A and B only
2. B.B and C only
3. C.A, B, C and D
4. D.A, C and D Only

Given below are two statements : Statement I : The number of pairs among $[\mathrm{T}{\mathrm{i}}^{4+},{\mathrm{V}}^{2+}]$, $[{\mathrm{V}}^{2+},\mathrm{M}{\mathrm{n}}^{2+}]$, $[\mathrm{M}{\mathrm{n}}^{2+},\mathrm{F}{\mathrm{e}}^{3+}]$ and $[{\mathrm{V}}^{2+},\mathrm{C}{\mathrm{r}}^{2+}]$ in which both ions are coloured is 3. Statement II : The number of pairs among $[\mathrm{L}{\mathrm{a}}^{3+},\mathrm{Y}{\mathrm{b}}^{2+}]$, $[\mathrm{L}{\mathrm{u}}^{3+},\mathrm{C}{\mathrm{e}}^{4+}]$ and $[\mathrm{A}{\mathrm{c}}^{3+},\mathrm{L}{\mathrm{r}}^{3+}]$ ions in which both are diamagnetic is 3. In the light of the above statements, choose the correct from the options given below :

1. A.Both Statement I and Statement II are correct
2. B.Both Statement I and Statement II are incorrect
3. C.Statement I is correct but Statement II is incorrect
4. D.Statement I is incorrect but Statement II is correct

1. A.$\alpha >\beta >\gamma$
2. B.$\alpha <\beta <\gamma$
3. C.$\alpha =\beta =\gamma$
4. D.$\alpha <\beta =\gamma$

Consider the following species: ${\text{BrF}}_5$, ${\text{XeF}}_5^{-}$, ${\text{BF}}_4^{-}$, ${\text{ICl}}_4^{-}$, ${\text{XeF}}_4$, ${\text{SF}}_4$, ${\text{NH}}_4^{+}$, ${\text{ClF}}_3$, ${\text{XeF}}_2$, ${\text{ICl}}_2^{-}$ Number of species having ${\text{sp}}^3\text{d}$ hybridized central atom is _______.

The covalent radii of atoms A and B are $r_{\mathrm{A}}$ and $r_{\mathrm{B}}$, respectively. The covalent bond length and total length of AB molecule are respectively

1. A.$(r_{\mathrm{A}}+r_{\mathrm{B}})$, $2(r_{\mathrm{A}}+r_{\mathrm{B}})$
2. B.$\frac{1}{2}(r_{\mathrm{A}}+r_{\mathrm{B}})$, $(r_{\mathrm{A}}+r_{\mathrm{B}})$
3. C.$(r_{\mathrm{A}}+r_{\mathrm{B}})$, $(r_{\mathrm{A}}+r_{\mathrm{B}})$
4. D.$2(r_{\mathrm{A}}+r_{\mathrm{B}})$, $\frac{1}{2}(r_{\mathrm{A}}+r_{\mathrm{B}})$

Given below are two statements : Statement I : Aluminium upon reaction with $\mathrm{NaOH}$ forms $[\mathrm{Al}(\mathrm{OH}{)}_6{]}^{3-}$ ion. Statement II : The geometry of $\mathrm{IC}{\mathrm{l}}_4^{-}$, $\mathrm{Cl}{\mathrm{O}}_3^{-}$ and $\mathrm{IB}{\mathrm{r}}_2^{-}$ is square planar, pyramidal and linear respectively. In the light of the above statements, choose the correct answer from the options given below :

1. A.Both Statement I and Statement II are true
2. B.Both Statement I and Statement II are false
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true

Given below are two statements: Statement I: For an ideal gas, heat capacity at constant volume is always greater than the heat capacity at constant pressure. Statement II: In a constant volume process, no work is produced and all the heat withdrawn goes into the chaotic motion and is reflected by a temperature increase of the ideal gas. In the light of the above statements, choose the correct answer from the options given below

1. A.Both Statement I and Statement II are true
2. B.Both Statement I and Statement II are false
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true

According to Lewis theory, the total number of $\sigma$ bond-pairs and lone pair of electrons around the central atom of $\mathrm{Xe}{\mathrm{O}}_6^{4-}$ ion is ____.

1. A.$x>y>z$
2. B.$y>z>x$
3. C.$z>x>y$
4. D.$x>z>y$

Given below are two statements : Statement (I) : The correct sequence of bond lengths in the following species is : $${\mathrm{O}}_2^{+}<{\mathrm{O}}_2<{\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{2-}$$ Statement (II) : The correct sequence of number of unpaired electrons in the following species is : $${\mathrm{O}}_2>{\mathrm{O}}_2^{+}>{\mathrm{O}}_2^{-}>{\mathrm{O}}_2^{2-}$$ In the light of the above statements, choose the correct answer from the options given below :

1. A.Both Statement I and Statement II are true
2. B.Both Statement I and Statement II are false
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true

Number of paramagnetic ions among the following d- and f-block metal ions is _________. $\mathrm{M}{\mathrm{n}}^{2+},\mathrm{C}{\mathrm{u}}^{2+},\mathrm{Z}{\mathrm{n}}^{2+},\mathrm{Y}{\mathrm{b}}^{2+},\mathrm{S}{\mathrm{c}}^{3+},\mathrm{L}{\mathrm{a}}^{3+},\mathrm{G}{\mathrm{d}}^{3+},\mathrm{L}{\mathrm{u}}^{3+},\mathrm{T}{\mathrm{i}}^{4+},\mathrm{C}{\mathrm{e}}^{4+}$ (Atomic number of $\mathrm{Mn}=25,\mathrm{Cu}=29,\mathrm{Zn}=30,\mathrm{Yb}=70,\mathrm{Sc}=21,\mathrm{La}=57,\mathrm{Gd}=64,\mathrm{Lu}=71,\mathrm{Ti}=22,\mathrm{Ce}=58$)

Given below are two statements : Statement I : The number of species among $\mathrm{B}{\mathrm{F}}_4^{-}$, $\mathrm{Si}{\mathrm{F}}_4$, $\mathrm{Xe}{\mathrm{F}}_4$ and $\mathrm{S}{\mathrm{F}}_4$, that have unequal $\mathrm{E}-\mathrm{F}$ bond lengths is two. Here, E is the central atom. Statement II : Among ${\mathrm{O}}_2^{-}$, ${\mathrm{O}}_2^{2-}$, ${\mathrm{F}}_2$ and ${\mathrm{O}}_2^{+}$, ${\mathrm{O}}_2^{-}$ has the highest bond order. In the light of the above statements, choose the correct answer from the options given below

1. A.Both Statement I and Statement II are false
2. B.Statement I is true but Statement II is false
3. C.Statement I is false but Statement II is true
4. D.Both Statement I and Statement II are true

Consider the following statements about manganate and permanganate ions. Identify the correct statements. A. The geometry of both manganate and permanganate ions is tetrahedral. B. The oxidation states of Mn in manganate and permanganate are +7 and +6, respectively. C. Oxidation of Mn(II) salt by peroxodisulphate gives manganate ion as the final product. D. Manganate ion is paramagnetic and permanganate ion is diamagnetic. E. Acidified permanganate ion reduces oxalate, nitrite and iodide ions. Choose the correct answer from the options given below :

1. A.A and D Only
2. B.A, B and C Only
3. C.A, C and D Only
4. D.A, D and E Only

Given below are statements about some molecules/ions. Identify the CORRECT statements. A. The dipole moment value of $\mathrm{N}{\mathrm{F}}_3$ is higher than that of $\mathrm{N}{\mathrm{H}}_3$. B. The dipole moment value of $\mathrm{Be}{\mathrm{H}}_2$ is zero. C. The bond order of ${\mathrm{O}}_2^{2-}$ and ${\mathrm{F}}_2$ is same. D. The formal charge on the central oxygen atom of ozone is -1 . E. In $\mathrm{N}{\mathrm{O}}_2$, all the three atoms satisfy the octet rule, hence it is very stable. Choose the correct answer from the options given below:

1. A.B & C Only
2. B.B, C & D Only
3. C.A, C & D Only
4. D.A, B, C, D & E

Identify the molecule ($X$) with maximum number of lone pairs of electrons (obtained using Lewis dot structure) among ${\mathrm{HNO}}_3,{\mathrm{H}}_2{\mathrm{SO}}_4,{\mathrm{NF}}_3$ and ${\mathrm{O}}_3$. Choose the correct bond angle made by the central atom of the molecule ($X$).

1. A.$107^{\circ }$
2. B.$102^{\circ }$
3. C.$120^{\circ }$
4. D.$116^{\circ }$

The statements that are incorrect about the nickel(II) complex of dimethylglyoxime are : A. It is red in colour. B. It has a high solubility in water at $\mathrm{pH}=9$. C. The Ni ion has two unpaired d-electrons. D. The $\mathrm{N}-\mathrm{Ni}-\mathrm{N}$ bond angle is almost close to $90^{\circ }$. E. The complex contains four five-membered metallacycles (metal containing rings). Choose the correct answer from the options given below :

1. A.C and E Only
2. B.A, D and B Only
3. C.B, C and E Only
4. D.C and D Only

Which statements are NOT TRUE about ${\text{XeO}}_2{\text{F}}_2$? A. It has a see-saw shape. B. Xe has 5 electron pairs in its valence shell in ${\text{XeO}}_2{\text{F}}_2$. C. The $\text{O}-\text{Xe}-\text{O}$ bond angle is close to $180^{\circ }$. D. The $\text{F}-\text{Xe}-\text{F}$ bond angle is close to $180^{\circ }$. E. Xe has 16 valence electrons in ${\text{XeO}}_2{\text{F}}_2$. Choose the correct answer from the options given below :

1. A.B, D and E Only
2. B.B and D Only
3. C.B, C and E Only
4. D.A and D Only

Two p-block elements X and Y form fluorides of the type $\mathrm{E}{\mathrm{F}}_3$. The fluoride compound $\mathrm{X}{\mathrm{F}}_3$ is a Lewis acid and $\mathrm{Y}{\mathrm{F}}_3$ is a Lewis base. The hybridizations of the central atoms of $\mathrm{X}{\mathrm{F}}_3$ and $\mathrm{Y}{\mathrm{F}}_3$ respectively are

1. A.$\mathrm{s}{\mathrm{p}}^2$ and $\mathrm{s}{\mathrm{p}}^3$
2. B.Both $\mathrm{s}{\mathrm{p}}^3$
3. C.Both $\mathrm{s}{\mathrm{p}}^2$
4. D.$\mathrm{s}{\mathrm{p}}^3$ and $\mathrm{s}{\mathrm{p}}^2$

1. A.Statement I is true but Statement II is false
2. B.Both Statement I and Statement II are true
3. C.Both Statement I and Statement II are false
4. D.Statement I is false but Statement II is true

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

1. A.D < C < B < A
2. B.D < C < A < B
3. C.A < B < C < D
4. D.A < D < C < B

Consider the following data : ${\Delta }_f{H}^{\circ }$ (methane, g) = $-X$ kJ $\mathrm{mo}{\mathrm{l}}^{-1}$ Enthalpy of sublimation of graphite = $Y$ kJ $\mathrm{mo}{\mathrm{l}}^{-1}$ Dissociation enthalpy of $H_2=Z$ kJ $\mathrm{mo}{\mathrm{l}}^{-1}$ The bond enthalpy of C−H bond is given by :

1. A.$\frac{X+Y+2Z}{4}$
2. B.$\frac{X+Y+4Z}{2}$
3. C.$\frac{-X+Y+Z}{4}$
4. D.$X+Y+Z$

Given below are two statements: \textbf{Statement I}: ${\mathrm{H}}_2\mathrm{Se}$ is more acidic than ${\mathrm{H}}_2\mathrm{Te}$ \textbf{Statement II}: ${\mathrm{H}}_2\mathrm{Se}$ has higher bond enthalpy for dissociation than ${\mathrm{H}}_2\mathrm{Te}$ In the light of the above statements, choose the $\underline{\text{correct}}$ answer from the options given below:

1. A.Both Statement I and Statement II are true
2. B.Statement I is true but Statement II is false
3. C.Both Statement I and Statement II are false
4. D.Statement I is false but Statement II is true

Given below are two statements. Statement I: The dipole moment of $\stackrel{4}{\mathrm{C}}{\mathrm{H}}_3-\stackrel{3}{\mathrm{C}}\mathrm{H}=\stackrel{2}{\mathrm{C}}\mathrm{H}-\stackrel{1}{\mathrm{C}}\mathrm{H}=\mathrm{O}$ is greater than $\stackrel{4}{\mathrm{C}}{\mathrm{H}}_3-\stackrel{3}{\mathrm{C}}{\mathrm{H}}_2-\stackrel{2}{\mathrm{C}}{\mathrm{H}}_2-\stackrel{1}{\mathrm{C}}\mathrm{H}=\mathrm{O}$ Statement II: ${\mathrm{C}}_1-{\mathrm{C}}_2$ bond length of $\underset{4}{\mathrm{C}}{\mathrm{H}}_3-\underset{3}{\mathrm{C}}\mathrm{H}=\underset{2}{\mathrm{C}}\mathrm{H}-\underset{1}{\mathrm{C}}\mathrm{H}=\mathrm{O}$ is greater than ${\mathrm{C}}_1-{\mathrm{C}}_2$ bond length of $\underset{4}{\mathrm{C}}{\mathrm{H}}_3-\underset{3}{\mathrm{C}}{\mathrm{H}}_2-\underset{2}{\mathrm{C}}{\mathrm{H}}_2-\underset{1}{\mathrm{C}}\mathrm{H}=\mathrm{O}$ In the light of the above statements, choose the correct answer from the options given below:

1. A.Both Statement I and Statement II are true
2. B.Statement I is true but Statement II is false
3. C.Statement I is false but Statement II is true
4. D.Both Statement I and Statement II are false

Which of the following molecule(s) show/s paramagnetic behavior? A. ${\mathrm{O}}_2$ B. ${\mathrm{N}}_2$ C. ${\mathrm{F}}_2$ D. ${\mathrm{S}}_2$ E. $\mathrm{C}{\mathrm{l}}_2$ Choose the correct answer from the options given below:

1. A.A & C only
2. B.A & E Only
3. C.A & D Only
4. D.B Only

A metal complex with a formula ${\mathrm{MCl}}_4\cdot 3{\mathrm{NH}}_3$ is involved in ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybridisation. It upon reaction with excess of ${\mathrm{AgNO}}_3$ solution gives ' $x$ ' moles of $\mathrm{AgCl}$. Consider ' $x$ ' is equal to the number of lone pairs of electron present in central atom of ${\mathrm{BrF}}_5$. Then the number of geometrical isomers exhibited by the complex is $\underline{}$.