Which quantity is altered when a catalyst is introduced during a chemical reaction?
| 1. | Internal energy | 2. | Enthalpy |
| 3. | Activation energy | 4. | Entropy |
Subtopic: Definition, Rate Constant, Rate Law |
94%
Level 1: 80%+
NEET - 2016
Hints
Mark the correct order of repulsion among the following according to the VSEPR theory.
| 1. | lone pair-lone pair > bond pair-bond pair >lone pair-bond pair |
| 2. | bond pair-bond pair> lone pair-bond pair>lone pair-lone pair |
| 3. | lone pair-bond pair > bond pair-bond pair >lone pair-lone pair |
| 4. | lone pair-lone pair> lone pair-bond pair>bond pair-bond pair |
Subtopic: V.S.E.P.R & V.B.T |
91%
Level 1: 80%+
NEET - 2016
Hints
The correct statement regarding the basicity of arylamines is:
| 1. | Arylamines are generally more basic than alkylamines because the lone-pair electrons of nitrogen are not delocalized by interaction with the aromatic ring π-electron system. |
| 2. | Arylamines are generally more basic than alkylamines because of the aryl group +I effect. |
| 3. | Arylamines are generally more basic than alkylamines because the nitrogen atom in arylamines is sp-hybridized. |
| 4. | Arylamines are generally less basic than alkylamines because the nitrogen lone-pair electrons are delocalized by interaction with the aromatic ring π-electron system. |
Subtopic: Amines - Preparation & Properties |
84%
Level 1: 80%+
NEET - 2016
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Links
When copper is heated with conc. HNO3 it produces:
1. Cu(NO3) and NO
2. Cu(NO3)2, NO and NO2
3. Cu(NO3)2 and N2O
4. Cu(NO3)2 and NO2
Subtopic: d-Block Elements- Properties & Uses |
57%
Level 3: 35%-60%
NEET - 2016
Hints
A few reactions are given below:
| i. | \(\small{\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}+\mathrm{KOH} \rightarrow \mathrm{CH}_3 \mathrm{CH}=\mathrm{CH}_2+\mathrm{KBr}+\mathrm{H}_2 \mathrm{O}}\) |
| ii. |  |
| iii. |  |
Select the reaction type for the above reactions:
| (i) | (ii) | (iii) | |
| 1. | Elimination | Substitution | Addition |
| 2. | Elimination | Substitution | Substitution |
| 3. | Substitution | Addition | Addition |
| 4. | Elimination | Elimination | Addition |
Subtopic: Chemical Properties |
87%
Level 1: 80%+
NEET - 2016
Hints
Two electrons occupying the same orbital are distinguished by:
1. Magnetic quantum number
2. Azimuthal quantum number
3. Spin quantum number
4. Principal quantum number
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
84%
Level 1: 80%+
NEET - 2016
Hints
The below-mentioned reaction can be classified as:
1. Dehydration reaction
2. Williamson alcohol synthesis
3. Williamson ether synthesis
4. Dehydrogenation of alcohol
Subtopic: Alcohols: Preparation & Properties |
Level 4: Below 35%
NEET - 2016
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Links
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64), and Tb (Atomic no. 65) are, respectively:
| 1. | [Xe] 4f6 5d1 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
| 2. | [Xe] 4f6 5d1 6s2, [Xe] 4f75d1 6s2, and [Xe]4f8 5d1 6s2
|
| 3. | [Xe] 4f7 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
| 4. | [Xe] 4f7 6s2, (Xe]4f8 6s2, and [Xe]4f8 5d1 6s2 |
Subtopic: f-Block Elements- Properties & Uses |
70%
Level 2: 60%+
NEET - 2016
Hints
At 100 °C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be:
| 1. | 100 oC | 2. | 102 oC |
| 3. | 103 oC | 4. | 101 oC |
Subtopic: Relative Lowering of Vapour Pressure | Elevation of Boiling Point |
59%
Level 3: 35%-60%
NEET - 2016
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Links
The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is:
| 1. | The eclipsed conformation of ethane is more stable than staggered conformation because eclipsed conformation has no torsional strain. |
| 2. | The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has a torsional strain. |
| 3. | The staggered conformation of ethane is more stable than eclipsed conformation because staggered conformation has no torsional strain. |
| 4. | The staggered conformation of ethane is less stable than eclipsed conformation because staggered conformation has a torsional strain. |
Subtopic: Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
83%
Level 1: 80%+
NEET - 2016
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