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An element \( A \) of group \( 1 \) shows similarity to an element \( B \) belonging to group \( 2 \). If \( A \) has maximum hydration enthalpy in group \( 1 \) then \( B \) is:

Match List -I and List-II

Choose the correct answer from the options given below:

The number of paramagnetic species among the following is ____________.
\( \mathrm{B_2}, \mathrm{Li_2}, \mathrm{C_2}, \mathrm{C_2^-}, \mathrm{O_2^{2-}}, \mathrm{O_2^+} \) and \( \mathrm{He_2^+} \)

Consider the ions/molecule \( \mathrm{O_2^{+}} \), \( \mathrm{O_2} \), \( \mathrm{O_2^{-}} \), \( \mathrm{O_2^{2-}} \). For increasing bond order the correct option is:

The geometry around boron in the product ‘B’ formed from the following reaction is
\( \displaystyle \text{BF}_3 + \text{NaH} \;\dfrac{450\text{K}}{\text{A} + \text{NMe}_3 \rightarrow \text{B}}\; \text{A} + \text{NaF}\)

Match List-I with List-II.

List-I (molecule)	List-II (hybridization; shape)
(A) \( \mathrm{XeO_3} \)	(I) \( sp^3d \); linear
(B) \( \mathrm{XeF_2} \)	(II) \( sp^3 \); pyramidal
(C) \( \mathrm{XeOF_4} \)	(III) \( sp^3d^3 \); distorted octahedral
(D) \( \mathrm{XeF_6} \)	(IV) \( sp^3d^2 \); square pyramidal

Choose the correct answer from the options given below:

Consider, \(\displaystyle \mathrm{PF}_5, \, \mathrm{BrF}_5, \, \mathrm{PCl}_3, \, \mathrm{SF}_6, \, [\mathrm{ICl}_4]^-, \, \mathrm{ClF}_3 \) and \( \mathrm{IF_5} \).
Amongst the above molecule(s) / ion(s), the number of molecule(s) / ion(s) having \( \mathrm{sp^{3}d^{2}} \) hybridization is ________.

Arrange the following in the decreasing order of their covalent character:
(A) \( \mathrm{LiCl} \) (B) \( \mathrm{NaCl} \) (C) \( \mathrm{KCl} \) (D) \( \mathrm{CsCl} \)
Choose the most appropriate answer from the options given below:

The correct order of increasing intermolecular hydrogen bond strength is

10.

Number of lone pairs of electrons in the central atom of \( \mathrm{SCl_2} \), \( \mathrm{O_3} \), \( \mathrm{ClF_3} \) and \( \mathrm{SF_6} \), respectively, are:

11.

Consider the species \( \mathrm{CH_4} \), \( \mathrm{NH_4^+} \) and \( \mathrm{BH_4^-} \). Choose the correct option with respect to the there species.

12.

The hybridization of \( \mathrm{P} \) exhibited in \( \mathrm{PF_5} \) is \( \mathrm{sp^x d^y} \). The value of \( y \) is ______.

13.

In the structure of \( \mathrm{SF}_4 \), the lone pair of electrons on \( \mathrm{S} \) is in.

14.

Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option.

15.

Amongst \( \mathrm{SF_4} \), \( \mathrm{XeF_4} \), \( \mathrm{CF_4} \) and \( \mathrm{H_2O} \), the number of species with two lone pairs of electrons is _______.

16.

Identify the correct statement for \( \mathrm{B_2H_6} \) , from those given below.
(A) In \( \mathrm{B_2H_6} \) , all B-H bonds are equivalent.
(B) In \( \mathrm{B_2H_6} \) there are four \( 3 \)-centre-\( 2 \)-electron bonds.
(C) \( \mathrm{B_2H_6} \) is a Lewis acid.
(D) \( \mathrm{B_2H_6} \) can be synthesized from both \( \mathrm{BF_3} \) and \( \mathrm{NaBH_4} \) .
(E) \( \mathrm{B_2H_6} \) is a planar molecule.
Choose the most appropriate answer from the options given below:

17.

Number of lone pair(s) of electrons on central atom and the shape of \( \mathrm{BrF_3} \) molecule respectively, are:

18.

Arrange the following in increasing order of their covalent character.
A. \( \mathrm{CaF_2} \) B. \( \mathrm{CaCl_2} \) C. \( \mathrm{CaBr_2} \) D. \( \mathrm{CaI_2} \)
Choose the correct answer from the options given below:

19.

The sum of number of lone pairs of electrons present on the central atoms of \( \mathrm{XeO_3} \), \( \mathrm{XeOF_4} \) and \( \mathrm{XeF_6} \), is ________.

20.

Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule?

21.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Zero orbital overlap is an out of phase overlap
Reason R: It results due to different orientation/direction of approach of orbitals.
In the light of the above statements, choose the correct answer from the options given below

22.

The number of molecule(s) or ion(s) from the following having non-planar structure is ______.
\( \mathrm{NO_3^-}, \ \mathrm{H_2O_2}, \ \mathrm{BF_3}, \ \mathrm{PCl_3}, \ \mathrm{XeF_4}, \ \mathrm{SF_4}, \ \mathrm{XeO_3}, \ \mathrm{PH_4^+}, \ \mathrm{SO_3}, \ \left[\mathrm{Al(OH)_4}\right]^- \)

23.

According to MO theory, number of species/ions from the following having identical bond order is _____. \( \mathrm{CN^-}, \mathrm{NO^+}, \mathrm{O_2}, \mathrm{O_2^+}, \mathrm{O_2^{2+}} \)

24.

Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron?
(A) \( \mathrm{NO} \) (B) \( \mathrm{N_2} \) (C) \( \mathrm{O_2} \) (D) \( \mathrm{C_2} \) (E) \( \mathrm{B_2} \)
Choose the most appropriate answer from the options given below:

25.

The correct order of bond orders of \( \text{C}_2^{2-} \), \( \text{N}_2^{2-} \) and \( \text{O}_2^{2-} \) is, respectively:

26.

Amongst \( \mathrm{BeF_2} \), \( \mathrm{BF_3} \), \( \mathrm{H_2O} \), \( \mathrm{NH_3} \), \( \mathrm{CCl_4} \) and \( \mathrm{HCl} \), the number of molecules with non-zero net dipole moment is __________.

27.

Amongst the following, the number of oxide(s) which are paramagnetic in nature is: \(\mathrm{Na_2O},\ \mathrm{KO_2},\ \mathrm{NO_2},\ \mathrm{N_2O},\ \mathrm{ClO_2},\ \mathrm{NO},\ \mathrm{SO_2},\ \mathrm{Cl_2O}\)

28.

The number of interhalogens from the following having square pyramidal structure is:
\( \mathrm{ClF}_3 \), \( \mathrm{IF}_7 \), \( \mathrm{BrF}_5 \), \( \mathrm{BrF}_3 \), \( \mathrm{I_2Cl}_6 \), \( \mathrm{IF}_5 \), \( \mathrm{ClF} \), \( \mathrm{ClF}_5 \)

29.

The number of \( sp^{3} \) hybridized carbons in an acyclic neutral compound with molecular formula \( \mathrm{C_4H_5N} \) is ______.

30.

Match List-I with List-II.

Choose the correct answer from the options given below:

31.

Among the following species
\( \mathrm{N_2, \, N_2^{+}, N_2^{-}, \, N_2^{2-}, \, O_2, \, O_2^{+}, O_2^{-}, \, O_2^{2-}} \)
The number of species showing diamagnetism is ______.

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