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Q. No.Given below are two statement :
| Statement-I : | All the given pairs of oxides—(PbO, PbO₂), (SnO, SnO₂), and (GeO, GeO₂)—are amphoteric in nature |
| Statement-II : | The molecules AlCl₃, BH₃, BeH₂, and NO₂ all have incomplete octets around their central atoms. |
| 1. | Both the statements are correct |
| 2. | Statement-I is correct ; Statement-II is incorrect |
| 3. | Statement-I is incorrect; Statement-II is correct |
| 4. | Both the statements are incorrect |
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
Level 4: Below 35%
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Hints
Which of the following is correct order of bond length?
1. \(\mathrm{C}-\mathrm{H}<\mathrm{C} \equiv \mathrm{N}<\mathrm{C}=\mathrm{O}<\mathrm{C}-\mathrm{O} \)
2. \(\mathrm{C} \equiv \mathrm{N}<\mathrm{C}-\mathrm{H}<\mathrm{C}-\mathrm{O}<\mathrm{C}=\mathrm{O} \)
3. \(\mathrm{C}-\mathrm{H}<\mathrm{C}\equiv\mathrm{N}<\mathrm{C}-\mathrm{O}<\mathrm{C}=\mathrm{O} \)
4. \(\mathrm{C}-\mathrm{O}<\mathrm{C}\equiv\mathrm{N}<\mathrm{C}=\mathrm{O}<\mathrm{C}-\mathrm{H}\)
1. \(\mathrm{C}-\mathrm{H}<\mathrm{C} \equiv \mathrm{N}<\mathrm{C}=\mathrm{O}<\mathrm{C}-\mathrm{O} \)
2. \(\mathrm{C} \equiv \mathrm{N}<\mathrm{C}-\mathrm{H}<\mathrm{C}-\mathrm{O}<\mathrm{C}=\mathrm{O} \)
3. \(\mathrm{C}-\mathrm{H}<\mathrm{C}\equiv\mathrm{N}<\mathrm{C}-\mathrm{O}<\mathrm{C}=\mathrm{O} \)
4. \(\mathrm{C}-\mathrm{O}<\mathrm{C}\equiv\mathrm{N}<\mathrm{C}=\mathrm{O}<\mathrm{C}-\mathrm{H}\)
Subtopic: Types of Chemical Bond | Covalent Bond | Polarity | Hybridisation |
64%
Level 2: 60%+
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Hints
Among the following species \(\mathrm{O}_2^{+}, \mathrm{N}_2^{-}, \mathrm{N}_2^{2-}\) and \({O}_2^{-}\) which have same bond order as well as paramagnetic in nature.
1. \(\mathrm{N}_2^{-}, \mathrm{N}_2^{2-}\)
2. \(\mathrm{O}_2^{+}, \mathrm{N}_2^{-}\)
3. \(\mathrm{O}_2^{+}, \mathrm{O}_2^{-}\)
4. \(\mathrm{O}_2^{-}, \mathrm{N}_2^{-}\)
1. \(\mathrm{N}_2^{-}, \mathrm{N}_2^{2-}\)
2. \(\mathrm{O}_2^{+}, \mathrm{N}_2^{-}\)
3. \(\mathrm{O}_2^{+}, \mathrm{O}_2^{-}\)
4. \(\mathrm{O}_2^{-}, \mathrm{N}_2^{-}\)
Subtopic: M.O.T | Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
90%
Level 1: 80%+
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Hints
Consider the following statements from A to E:
Select the correct statements(s):
1. B, C
2. A, B, C
3. C, D, E
4. B, E
| (A) | \(NF_3\) has more dipole moment than \(NH_3\) |
| (B) | \(O^{-2}_2\) and \(F_2\) both have same bond order |
| (C) | In \(O_3\) central oxygen atom has -1 formal charge |
| (D) | In \(NO_2\) all the atoms follow octet rule, so it is stable |
| (E) | \(BeH_2\) is planar |
Select the correct statements(s):
1. B, C
2. A, B, C
3. C, D, E
4. B, E
Subtopic: Types of Chemical Bond | M.O.T | Octate, Isoelectronic Species, Lewis Structure & Formal Charge | van der Waal Force & Hydrogen Bonding |
79%
Level 2: 60%+
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Hints
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Molecules with least dipole moment among the following species \(\mathrm{CHCl}_3, \mathrm{NF}_3, \mathrm{H}_2 \mathrm{S}, \mathrm{H}_2 \mathrm{O}, \mathrm{NH}_3\) has 'X' number of lone pair on central atom: Find X:
1. 0
2. 1
3. 2
4. 3
1. 0
2. 1
3. 2
4. 3
Subtopic: Polarity | V.S.E.P.R & V.B.T |
71%
Level 2: 60%+
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Hints
Consider the structure of \(HNO_3\):
Select the correct option having formal charges on I, II, III & IV respectively:
1. –1, 1, +1, 0
2. 0, 0, +1, –1
3. –1, 0, 0, +1
4. +1, –1, 0, 0
Select the correct option having formal charges on I, II, III & IV respectively:
1. –1, 1, +1, 0
2. 0, 0, +1, –1
3. –1, 0, 0, +1
4. +1, –1, 0, 0
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge | Resonance & Nature of Compounds |
87%
Level 1: 80%+
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Hints
For \(XeO_2F_2,\) select the correct statements:
(A) It has see-saw shape
(B) \( \angle \mathrm{FXeF} \approx 180^{\circ} \)
(C) \( \angle \mathrm{OXeO} \approx 180^{\circ} \)
(D) Number of valence electron on Xe = 5
1. A, B, C and D
2. A and B only
3. B and D only
4. A and C only
(A) It has see-saw shape
(B) \( \angle \mathrm{FXeF} \approx 180^{\circ} \)
(C) \( \angle \mathrm{OXeO} \approx 180^{\circ} \)
(D) Number of valence electron on Xe = 5
1. A, B, C and D
2. A and B only
3. B and D only
4. A and C only
Subtopic: V.S.E.P.R & V.B.T |
78%
Level 2: 60%+
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Hints
Which of the following linear combination of atomic orbitals will lead to the formation of molecular orbitals in homonuclear diatomic molecules [internuclear axis in z-direction]?
A. \(2 p_z \text { and } 2 p_x\)
B. \(2 \mathrm{s} \text { and } 2 \mathrm{p}_{\mathrm{x}}\)
C. \(3 d_{x y} \text { and } 3 d_{x^2-y^2}\)
D. \(2 \mathrm{s} \text { and } 2 \mathrm{p}_{\mathrm{z}}\)
E. \(2 p_z \text { and } 3 d_{x^2-y^2}\)
1. E Only
2. A and B Only
3. D Only
4. C and D Only
A. \(2 p_z \text { and } 2 p_x\)
B. \(2 \mathrm{s} \text { and } 2 \mathrm{p}_{\mathrm{x}}\)
C. \(3 d_{x y} \text { and } 3 d_{x^2-y^2}\)
D. \(2 \mathrm{s} \text { and } 2 \mathrm{p}_{\mathrm{z}}\)
E. \(2 p_z \text { and } 3 d_{x^2-y^2}\)
1. E Only
2. A and B Only
3. D Only
4. C and D Only
Subtopic: Types of Chemical Bond | V.S.E.P.R & V.B.T |
62%
Level 2: 60%+
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Hints
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Which of the following statements is true with respect to \(\mathrm{H}_2 \mathrm{O}, \mathrm{NH}_3 \text { and } \mathrm{CH}_4\)?
Choose the correct answer from the options given below:
1. A, B and C only
2. C, D and E only
3. A, D and E only
4. A, B, C and E only
| A. | The central atoms of all the molecules are sp3 hybridized |
| B. | The H–O–H, H–N–H and H–C–H angles in the above molecules are 104.5º, 107.5º and 109.5º respectively. |
| C. | The increasing order of dipole moment is \(\mathrm{CH}_4<\mathrm{NH}_3<\mathrm{H}_2 \mathrm{O} .\) |
| D. | Both H2O and NH3 are Lewis acids and CH4 is a Lewis base |
| E. | A solution of NH3 in H2O is basic. In this solution NH3 and H2O act as Lowry-Bronsted acid and base respectively. |
1. A, B and C only
2. C, D and E only
3. A, D and E only
4. A, B, C and E only
Subtopic: V.S.E.P.R & V.B.T |
60%
Level 2: 60%+
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Hints
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Match the molecules in List-I based on their classification according to the octet rule with the correct examples in List-II:
Choose the correct answer from the options given below:
| List-I (Classification of molecules based on octet rule) | List-II (Example) |
||
| A. |
Molecules that adhere to the octet rule. |
I. | NO, NO2 |
| B. | Molecules with an incomplete octet | II. | BCl3 , AlCl3 |
| C. | Molecules with incomplete octets with odd electron | III. | H2SO4 , PCl5 |
| D. | Molecules with an expanded octet | IV. | CCl4 , CO2 |
| 1. | A-IV, B-II, C-I, D-III | 2. | A-III, B-II, C-I, D-IV |
| 3. | A-IV, B-I, C-III, D-II | 4. | A-II, B-IV, C-III, D-I |
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
87%
Level 1: 80%+
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