Question Bank Directory

$d\pi - p\pi$ bond is present in:

Arrange the following hydrides in the order of decreasing bond angle: (A) SbH$$_3$$ (B) AsH$$_3$$ (C) PH$$_3$$ (D) NH$$_3$$

BF_{3} is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :

Select the correct option based on the statements below: **Assertion (A):** The metal-carbon bond in metal carbonyls possesses both $\sigma$ and $\pi$ character. **Reason (R):** The ligand to metal bond is a $\pi$ bond and metal to ligand bond is a $\sigma$ bond.

Match List-I with List-II

Jahn-Teller effect is not observed in high spin complexes of:

Homoleptic complex from the following complexes is:

The name of complex ion, $[Fe(CN)_6]^{3-}$ is :

The sum of coordination number and oxidation number of the metal M in the complex $[M(en)_2(C_2O_4)]Cl$ (where, en is ethylenediamine) is:

Choose the compound which has a maximum bond angle at nitrogen among the following:

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them.

Match the complexes from List-I with their corresponding type of isomerism from List-II: **List-I (Complex)** (A) $[Co(NH_3)_5(NO_2)]Cl_2$ (B) $[Co(NH_3)_5(SO_4)]Br$ (C) $[Co(NH_3)_6][Cr(CN)_6]$ (D) $[Co(H_2O)_6]Cl_3$ **List-II (Type of isomerism)** (I) Solvate isomerism (II) Linkage isomerism (III) Ionization isomerism (IV) Coordination isomerism Choose the correct option:

Match the coordination number and type of hybridisation with the distribution of hybrid orbitals in space based on Valence Bond Theory. **List I (Coordination number and type of hybridisation):** (a) 4, $sp^{3}$ (b) 4, $dsp^{2}$ (c) 5, $sp^{3}d$ (d) 6, $d^{2}sp^{3}$ **List II (Distribution of hybrid orbitals in space):** (i) Trigonal bipyramidal (ii) Octahedral (iii) Tetrahedral (iv) Square planar

The compound that forms a linear polymer due to hydrogen bonding is:

The d-electron configurations of $Cr^{2+}$, $Mn^{2+}$, $Fe^{2+}$ and $Co^{2+}$ are $d^4$, $d^5$, $d^6$ and $d^7$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27)

The correct order of increasing bond angles in the following species is:

Among the options given below, identify the isoelectronic species:

Which one of the following statements is true about the structure of $CO_3^{2-}$ ion?

Given below are two statements: **Statement I:** Both $[Co(NH_3)_6]^{3+}$ and $[CoF_6]^{3-}$ complexes are octahedral but differ in their magnetic behaviour. **Statement II:** $[Co(NH_3)_6]^{3+}$ is diamagnetic whereas $[CoF_6]^{3-}$ is paramagnetic. In the light of the above statements, choose the correct answer from the options given below:

Which of the following has the longest C-O bond length? (Free C-O bond length in CO is 1.128 Å.)