Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5 :

Which of the following are isostructural pairs ? A. $$S{O}_4^{2-}$$ and $$Cr{O}_4^{2-}$$ B. SiCl4, and TiCl4 C. NH3 and NO3- D. BCl3 and BrCl3

The correct set from the following in which both pairs are in correct order of melting point is :

The correct shape and $$I-I-I$$ bond angles respectively in $$I_3^{-}$$ ion are :

According to molecular orbital theory, the species among the following that does not exist is :

Which among the following species has unequal bond lengths?

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation. Reason R : Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical. In the light of the above statements, choose the most appropriate answer from the options given below :

Match List - I with List - II. List - I (Molecule) List - II (Bond order) (a) $$N{e}_2$$ (i) 1 (b) $$N_2$$ (ii) 2 (c) $$F_2$$ (iii) 0 (d) $$O_2$$ (iv) 3 Choose the correct answer from the options given below :

Given below are two statements : one is labeled as Assertion A and the other is labelled as Reason R : Assertion A : The H$$-$$O$$-$$H bond angle in water molecule is 104.5$${}^{\circ }$$. Reason R : The lone pair - lone pair repulsion of electrons is higher than the bond pair - bond pair repulsion. In the light of the above statements, choose the correct answer from the options given below :

A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is :

Amongst the following, the linear species is :

The hybridisations of the atomic orbitals of nitrogen in NO$${}_2^{-}$$, NO$${}_2^{+}$$ and NH$${}_4^{+}$$ respectively are.

Match List-I with List-II : List-I (Species) List-II (Hybrid Orbitals) (a) $$S{F}_4$$ (i) $$s{p}^3{d}^2$$ (b) $$I{F}_5$$ (ii) $$d^{2}s{p}^3$$ (c) $$N{O}_2^{+}$$ (iii) $$s{p}^{3}d$$ (d) $$N{H}_4^{+}$$ (iv) $$s{p}^3$$ (v) $$sp$$ Choose the correct answer from the options given below :

In the following the correct bond order sequence is :

Identify the species having one $$\pi$$-bond and maximum number of canonical forms from the following :

The bond order and magnetic behaviour of $$O_2^{-}$$ ion are respectively :

Match List - I with List - II : Choose the most appropriate answer from the options given below :

Match items of List-I with those of List-II : List - I (Property) List - II (Example) (a) Diamagnetism (i) MnO (b) Ferrimagnetism (ii) $$O_2$$ (c) Paramagnetism (iii) NaCl (d) Antiferromagnetism (iv) $$F{e}_3{O}_4$$ Choose the most appropriate answer from the options given below :

Number of paramagnetic oxides among the following given oxides is ____________. Li2O, CaO, Na2O2, KO2, MgO and K2O

Out of the following, which type of interaction is reponsible for the stabilisation of $$\alpha$$-helix structure of proteins ?