MERIT YARD

Class 11 Chem - Chemical Bonding - MERIT YARD

1 / 40The famous 'Octet Rule' for chemical bonding was proposed strictly by:

A) Kossel and Lewis

B) Niels Bohr

C) John Dalton

D) Ernest Rutherford

2 / 40Which specific type of bond involves the complete transfer of electrons from one atom to another?

A) Covalent bond

B) Ionic bond

C) Metallic bond

D) Hydrogen bond

3 / 40Which specific type of bond involves the mutual and equal sharing of electrons between two atoms?

A) Ionic bond

B) Coordinate bond

C) Covalent bond

D) Electrovalent bond

4 / 40According to VSEPR theory, the geometrical shape of a Methane molecule
\( (CH_4) \) is:

A) Square planar

B) Linear

C) Octahedral

D) Tetrahedral

5 / 40According to VSEPR theory, the molecular shape of Water
\( (H_2O) \) is:

A) Bent / V-shape

B) Linear

C) Tetrahedral

D) Trigonal planar

6 / 40How many bond pairs (bp) and lone pairs (lp) are strictly present in Ammonia
\( (NH_3) \)?

A) 4 bp, 0 lp

B) 3 bp, 1 lp

C) 2 bp, 2 lp

D) 1 bp, 3 lp

7 / 40What is the exact state of hybridization of the central Carbon atom in Methane
\( (CH_4) \)?

A) \( sp \)

B) \( sp^2 \)

C) \( sp^3 \)

D) \( sp^3d \)

8 / 40What is the exact state of hybridization of the Carbon atoms in Ethyne
\( (C_2H_2) \)?

A) \( sp^3 \)

B) \( sp^2 \)

C) \( sp^3d \)

D) \( sp \)

9 / 40The standard bond angle in a perfectly tetrahedral molecule like Methane
\( (CH_4) \) is:

A) \( 109.5^\circ \)

B) \( 120^\circ \)

C) \( 180^\circ \)

D) \( 90^\circ \)

10 / 40The standard bond angle in a perfectly linear molecule like Beryllium Chloride
\( (BeCl_2) \) is:

A) \( 120^\circ \)

B) \( 180^\circ \)

C) \( 90^\circ \)

D) \( 109.5^\circ \)

11 / 40The fundamental VSEPR theory generally predicts the shape of a molecule based strictly on the:

A) Size of the atoms

B) Mass of the nucleus

C) Repulsion of electron pairs

D) Nuclear force

12 / 40The strong covalent bond formed by the head-on (axial) overlapping of atomic orbitals is called a:

A) Hydrogen bond

B) Pi \( (\pi) \) bond

C) Coordinate bond

D) Sigma \( (\sigma) \) bond

13 / 40The covalent bond formed by the lateral (sideways) overlapping of atomic orbitals is called a:

A) Pi \( (\pi) \) bond

B) Sigma \( (\sigma) \) bond

C) Ionic bond

D) Metallic bond

14 / 40A standard chemical "Double bond" between two atoms strictly consists of:

A) Two sigma bonds

B) One sigma and one pi bond

C) Two pi bonds

D) One sigma and two pi bonds

15 / 40A standard chemical "Triple bond" between two atoms strictly consists of:

A) Three sigma bonds

B) Two sigma and one pi bond

C) One sigma and two pi bonds

D) Three pi bonds

16 / 40Among the following multiple bonds, which bond is generally considered the strongest and shortest?

A) Single bond

B) Double bond

C) Hydrogen bond

D) Triple bond

17 / 40The standard practical unit used for expressing the Dipole Moment \( (\mu) \) is:

A) Debye (D)

B) Newton (N)

C) Pascal (Pa)

D) Kelvin (K)

18 / 40Which of these specific molecules is perfectly non-polar and has a zero dipole moment?

A) \( H_2O \)

B) \( CO_2 \)

C) \( NH_3 \)

D) \( HCl \)

19 / 40According to Molecular Orbital Theory (MOT), the Bond Order of Oxygen
\( (O_2) \) is:

A) \( 1 \)

B) \( 3 \)

C) \( 2 \)

D) \( 0 \)

20 / 40According to Molecular Orbital Theory (MOT), the Bond Order of Nitrogen
\( (N_2) \) is:

A) \( 1 \)

B) \( 2 \)

C) \( 0 \)

D) \( 3 \)

21 / 40The standard formula for calculating the Bond Order using Molecular Orbitals is:

A) \( \frac{N_b - N_a}{2} \)

B) \( \frac{N_b + N_a}{2} \)

C) \( N_b - N_a \)

D) \( N_a - N_b \)

22 / 40If the calculated Bond Order of a diatomic molecule is perfectly zero, it scientifically means:

A) The bond is very strong

B) The molecule does not exist

C) The molecule is highly stable

D) The bond is ionic

23 / 40The unique paramagnetic nature of Oxygen gas \( (O_2) \) is successfully explained only by:

A) VSEPR Theory

B) Valence Bond Theory (VBT)

C) Molecular Orbital Theory (MOT)

D) Octet Rule

24 / 40Paramagnetic substances strictly contain unpaired electrons and are weakly attracted by a:

A) Electric field

B) Gravitational field

C) Thermal field

D) Magnetic field

25 / 40Intramolecular hydrogen bonding (within the same molecule) is distinctly present in:

A) o-Nitrophenol

B) Water \( (H_2O) \)

C) Ammonia \( (NH_3) \)

D) Hydrogen Fluoride \( (HF) \)

26 / 40Intermolecular hydrogen bonding (between different molecules) is distinctly present in:

A) o-Nitrophenol

B) Water \( (H_2O) \)

C) Benzene

D) Methane \( (CH_4) \)

27 / 40A normal Hydrogen bond is generally much weaker than a typical:

A) London dispersion force

B) Dipole-dipole force

C) Covalent bond

D) Van der Waals force

28 / 40According to VSEPR theory, the molecular shape of Sulfur Hexafluoride
\( (SF_6) \) is:

A) Trigonal bipyramidal

B) Tetrahedral

C) Linear

D) Octahedral

29 / 40According to VSEPR theory, the molecular shape of Phosphorus Pentachloride
\( (PCl_5) \) is:

A) Trigonal bipyramidal

B) Octahedral

C) Square planar

D) Tetrahedral

30 / 40What is the exact state of hybridization of the central Phosphorus atom in
\( PCl_5 \)?

A) \( sp^3 \)

B) \( sp^3d \)

C) \( sp^3d^2 \)

D) \( sp^2 \)

31 / 40What is the exact state of hybridization of the central Sulfur atom in
\( SF_6 \)?

A) \( sp^3 \)

B) \( sp^3d \)

C) \( sp^3d^2 \)

D) \( dsp^2 \)

32 / 40The Formal Charge on any atom in a Lewis structure is primarily calculated using its:

A) Core electrons

B) Total protons

C) Total neutrons

D) Valence electrons

33 / 40An ionic bond is most easily formed when the Ionization Energy of the participating metal atom is:

A) Very Low

B) Very High

C) Infinite

D) Zero

34 / 40The amount of energy strictly required to completely separate one mole of a solid ionic compound into gaseous ions is called:

A) Hydration enthalpy

B) Lattice enthalpy

C) Ionization enthalpy

D) Electron gain enthalpy

35 / 40Which of the following molecules has an incomplete octet and disobeys the octet rule?

A) \( CH_4 \)

B) \( H_2O \)

C) \( BF_3 \)

D) \( NH_3 \)

36 / 40Which of the following molecules shows an expanded octet (more than 8 valence electrons)?

A) \( H_2O \)

B) \( BeCl_2 \)

C) \( BF_3 \)

D) \( SF_6 \)

37 / 40Diamagnetic substances are weakly repelled by a magnetic field because they strictly contain:

A) All paired electrons

B) Unpaired electrons

C) No electrons

D) Only protons

38 / 40Which of the following intermolecular forces is generally considered the weakest?

A) Hydrogen bonding

B) London dispersion forces

C) Ion-dipole forces

D) Dipole-dipole forces

39 / 40The Dipole moment \( (\mu) \) is mathematically defined as the product of charge \( (q) \) and the:

A) Mass of atom

B) Atomic radius

C) Distance of separation \( (d) \)

D) Ionization energy

40 / 40The standard molecular geometry of an \( sp^2 \) hybridized central carbon atom is:

A) Tetrahedral

B) Linear

C) Octahedral

D) Trigonal planar

Test Analysis

Correct ✅ 0

Wrong ❌ 0

Unattempted ⚠️ 40

Accuracy 🎯 0%

Time Taken ⏱️ 00m 00s

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