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JEE Mains | PYQ

The equilibrium composition for the reaction for the reaction \( \mathrm{PCl_3} + \mathrm{Cl_2} \rightleftharpoons \mathrm{PCl_5} \) at \( 298 \, \text{K} \) is given below:
\( [\mathrm{PCl_3}]_{\mathrm{eq}} = 0.2 \, \text{mol} \, \text{L}^{-1}, \; [\mathrm{Cl_2}]_{\mathrm{eq}} = 0.1 \, \text{mol} \, \text{L}^{-1}, \; [\mathrm{PCl_5}]_{\mathrm{eq}} = 0.40 \, \text{mol} \, \text{L}^{-1} \)
If \( 0.2 \, \text{mol} \) of \( \mathrm{Cl_2} \) is added at the same temperature the equilibrium concentrations of \( \mathrm{PCl_5} \) is ________ \( \times 10^{-2} \, \text{mol} \, \text{L}^{-1} \)
Given: \( K_c \) for the reaction at \( 298 \, \text{K} \) is \( 20 \)

The number of molecules or ions from the following, which do not have odd number of electrons are ________.
(A) \( \mathrm{NO_2} \) (B) \( \mathrm{ICl_4^-} \) (C) \( \mathrm{BrF_3} \)
(D) \( \mathrm{ClO_2} \) (E) \( \mathrm{NO_2^+} \) (F) \( \mathrm{NO} \)

According to MO theory the bond orders for \( \mathrm{O_2^{2-}} \), \( \mathrm{CO} \) and \( \mathrm{NO^+} \) respectively, are:

What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species: \( \mathrm{N_2} \) ; \( \mathrm{N_2^+} \) ; \( \mathrm{O_2} \) ; \( \mathrm{O_2^+} \) ?

The compound which does not exist is:

The number of molecules from the following which contain only two lone pair of electrons is ______.
\( \mathrm{H_2O}, \mathrm{N_2}, \mathrm{CO}, \mathrm{XeF_4}, \mathrm{NH_3}, \mathrm{NO}, \mathrm{CO_2}, \mathrm{F_2} \)

Statement I: Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative centre and head pointing towards the positive centre.
Statement II: The crossed arrow of the dipole moment symbolizes the direction of the shift of charges in the molecules.
In the light of the above statements, choose the most appropriate answer from the options given below:

The total number of lone pairs of electrons on oxygen atoms of ozone is __________ .

The number of species from the following carrying a single lone pair on central atom Xenon is ________.
\( \mathrm{XeF_5^+}, \mathrm{XeO_3}, \mathrm{XeO_2F_2}, \mathrm{XeF_5^-}, \mathrm{XeO_3F_2}, \mathrm{XeOF_4}, \mathrm{XeF_4} \)

The sum of lone pairs present on the central atom of the interhalogen \( \mathrm{IF_5} \) and \( \mathrm{IF_7} \) is ______

Given below are two statements:
Statement I : \( \mathrm{SO_2} \) and \( \mathrm{H_2O} \) both possess V-shaped structure.
Statement II : The bond angle of \( \mathrm{SO_2} \) is less than that of \( \mathrm{H_2O} \).
In the light of the above statements, choose the most appropriate answer from the options given below:

Amongst the following, the number of species having the linear shape is __________.
\( \mathrm{XeF_2, \ I_3^+, \ C_3O_2, \ I_3^-, \ CO_2, \ SO_2, \ BeCl_2} \) and \( \mathrm{BCl_2^{\Theta}} \)

The correct increasing order of the ionic radii is:

The number of colloidal systems from the following, which will have ‘liquid’ as the dispersion medium, is ________ .
Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather

Match List I with List II.

$\text{O}-\text{O}$ bond length in $\text{H}_2\text{O}_2$ is $\underline{\text{X}}$ than the $\text{O}-\text{O}$ bond length in $\text{F}_2\text{O}_2$. The $\text{O}-\text{H}$ bond length in $\text{H}_2\text{O}_2$ is $\underline{\text{Y}}$ than that of the $\text{O}-\text{F}$ bond in $\text{F}_2\text{O}_2$.

Choose the correct option for $\underline{\text{X}}$ and $\underline{\text{Y}}$ from those given below:

Match List-I with List-II.

Choose the correct answer from the options given below:

Match List-I with List-II:

Choose the correct answer from the options given below:

Resonance in carbonate ion \( \mathrm({CO_3^{2-}} \)) is :

Which of the follwing is true?

The pair from the following pairs having both compounds with net non-zero dipole moment is:

The maximum number of lone pairs of electrons on the central atom from the following species is ________ \( \mathrm{ClO_3^-} \), \( \mathrm{XeF_4} \), \( \mathrm{SF_4} \) and \( \mathrm{I_3^-} \).

Consider the following statements:
(A) \( \mathrm{NF_3} \) molecule has a trigonal planar structure
(B) Bond length of \( \mathrm{N_2} \) is shorter than \( \mathrm{O_2} \)
(C) Isoelectronic molecules or ions have identical bond order
(D) Dipole moment of \( \mathrm{H_2S} \) is higher than that of water molecule
Choose the correct answer from the options given below:

Order of covalent bond:
I. \( \mathrm{KF} > \mathrm{KI} ; \mathrm{LiF} > \mathrm{KF} \)
II. \( \mathrm{KF} < \mathrm{KI} ; \mathrm{LiF} > \mathrm{KF} \)
III. \( \mathrm{SnCl_4} > \mathrm{SnCl_2} ; \mathrm{CuCl} > \mathrm{NaCl} \)
IV. \( \mathrm{LiF} > \mathrm{KF} ; \mathrm{CuCl} < \mathrm{NaCl} \)
V. \( \mathrm{KF} < \mathrm{KI} ; \mathrm{CuCl} > \mathrm{NaCl} \)
Choose the correct answer from the options given below:

Given below are two statements :
Statement I : \( \mathrm{SbCl_5} \) is more covalent than \( \mathrm{SbCl_3} \)
Statement II : The higher oxides of halogens also tend to be more stable than the lower ones.
In the light of the above statements, choose the most appropriate answer from the options given below

The number of following factors which affect the percent covalent character of the ionic bond is ________.
(A) Polarising power of cation                 (B) Extent of distortion of anion
(C) Polarisability of the anion                   (D) Polarising power of anion

The number of bent-shaped molecule/s from the following is _________
\( \mathrm{N_3^-} \), \( \mathrm{NO_2^-} \), \( \mathrm{I_3^-} \), \( \mathrm{O_3} \), \( \mathrm{SO_2} \)

Which one of the following pairs is an example of polar molecular solids?

The bond order and magnetic property of acetylide ion are same as that of :

The magnetic behavior of \( \mathrm{Li_2O} \), \( \mathrm{Na_2O_2} \) and \( \mathrm{KO_2} \), respectively, are:

For \( \mathrm{OF_2} \) molecule consider the following:
A. Number of lone pairs on oxygen is \( 2 \).
B. FOF angle is less than \( 104.5^\circ \).
C. Oxidation state of O is \( -2 \).
D. Molecule is bent ‘V’ shaped.
E. Molecular geometry is linear.
Correct option are: