Every question from past board papers on Chemical Bonding and Molecular Structure, newest paper first. Open any question for its full worked answer.
Given below are two statements :
Statement I : A hypothetical diatomic molecule with bond order zero is quite stable.
Statement II : As bond order increases, the bond length increases.
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: A. \(\mathrm{XeO_3}\) B. \(\mathrm{XeF_2}\) C. \(\mathrm{XeOF_4}\) D. \(\mathrm{XeF_6}\)
List-II: I. \(sp^3d\); linear II. \(sp^3\); pyramidal III. \(sp^3d^3\); distorted octahedral IV. \(sp^3d^2\); square pyramidal
Choose the correct answer from the options given below :
Identify the correct orders against the property mentioned :
A. \(\mathrm{H_2O > NH_3 > CHCl_3}\) - dipole moment
B. \(\mathrm{XeF_4 > XeO_3 > XeF_2}\) - number of lone pairs on central atom
C. O-H > C-H > N-O - bond length
D. \(\mathrm{N_2 > O_2 > H_2}\) - bond enthalpy
Choose the correct answer from the options given below :
Match List I with List II.
List I (Compound): A. \(NH_3\) B. \(BrF_5\) C. \(XeF_4\) D. \(SF_6\)
List II (Shape/geometry): I. Trigonal Pyramidal II. Square Planar III. Octahedral IV. Square Pyramidal
Choose the correct answer from the options given below:
Match List I with List II.
List I (Molecule): A. ethane B. ethene C. carbon molecule, \(C_2\) D. ethyne
List II (Number and types of bond/s between two carbon atoms): I. one \(\sigma\)-bond and two \(\pi\)-bonds II. two \(\pi\)-bonds III. one \(\sigma\)-bond IV. one \(\sigma\)-bond and one \(\pi\)-bond
Choose the correct answer from the options given below:
Intramolecular hydrogen bonding is present in
Arrange the following elements in increasing order of electronegativity:
N, O, F, C, Si
Choose the correct answer from the options given below:
Identify the correct answer.
A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is A\(_x\)B\(_y\), then the value of x + y is in option
The correct order of energies of molecular orbitals of N\(_2\) molecule, is :
Intermolecular forces are forces of attraction and repulsion between interacting particles that will include :
A. dipole - dipole forces.
B. dipole - induced dipole forces.
C. hydrogen bonding.
D. covalent bonding.
E. dispersion forces.
Choose the most appropriate answer from the options given below :
The number of \(\sigma\) bonds, \(\pi\) bonds and lone pair of electrons in pyridine, respectively are :
Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, is
NH\(_3\), AlCl\(_3\), BeCl\(_2\), CCl\(_4\), PCl\(_5\) :
What fraction of one edge centred octahedral void lies in one unit cell of fcc?
Which amongst the following is incorrect statement ?
Amongst the following which one will have maximum 'lone pair - lone pair' electron repulsions ?
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) :
In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells.
Reason (R) :
In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.
In the light of the above statements, choose the most appropriate answer from the options given below :
\(BF_3\) is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :
Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :
The structures of beryllium chloride in solid state and vapour phase, are :
Match List - I with List - II.
List - I : (a) \(PCl_5\) (b) \(SF_6\) (c) \(BrF_5\) (d) \(BF_3\)
List - II : (i) Square pyramidal (ii) Trigonal planar (iii) Octahedral (iv) Trigonal bipyramidal
Choose the correct answer from the options given below.
Which of the following molecules is non-polar in nature ?
Identify a molecule which does not exist.
An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is :
Which of the following set of molecules will have zero dipole moment ?
Which of the following diatomic molecular species has only \(\pi\) bonds according to Molecular Orbital Theory ?
A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :
In the structure of ClF\(_3\), the number of lone pairs of electrons on central atom 'Cl' is
Among CaH\(_2\), BeH\(_2\), BaH\(_2\), the order of ionic character is
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s\(^2\) 2s\(^2\) 2p\(^3\), the simplest formula for this compound is
Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is
Consider the following species :
CN\(^+\), CN\(^-\), NO and CN
Which one of these will have the highest bond order ?
The species, having bond angles of \(120°\) is :
Which one of the following pairs of species have the same bond order ?
Which of the following pairs of compounds is isoelectronic and isostructural ?
Which is the incorrect statement ?
Consider the molecules \(CH_4\), \(NH_3\) and \(H_2O\). Which of the given statements is false ?
Predict the correct order among the following :
Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option.
Column I: (a) \(XeF_6\); (b) \(XeO_3\); (c) \(XeOF_4\); (d) \(XeF_4\)
Column II: (i) distorted octahedral; (ii) square planar; (iii) pyramidal; (iv) square pyramidal
Code: (a) (b) (c) (d)
The ionic radii of \(A^{+}\) and \(B^{-}\) ions are \(0.98\times10^{-10}\) m and \(1.81\times10^{-10}\) m. The coordination number of each ion in AB is :
The hybridizations of atomic orbitals of nitrogen in \(NO_2^+\), \(NO_3^-\) and \(NH_4^+\) respectively are
Which of the following pairs of ions is isoelectronic and isostructural?
The correct geometry and hybridization for \(XeF_4\) are
Among the following, which one is a wrong statement?
Which one of the following compounds shows the presence of intramolecular hydrogen bond?
In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (\(Ca^{2+}\)) and fluoride ion (\(F^-\)) are
