Identify the statement that is incorrect regarding chirality:
| 1. | A racemic mixture shows zero optical rotation |
| 2. | SN1 reaction yields a 1:1 mixture of both enantiomers |
| 3. | The product obtained by SN2 reaction of haloalkane having chirality at the reactive site shows the inversion of configuration |
| 4. | Enantiomers are superimposable mirror images on each other |
Subtopic: Chemical Properties |
76%
Level 2: 60%+
NEET - 2022
Hints
The IUPAC name of an element with atomic number 119 is:
1. Ununoctium
2. Ununennium
3. Unnilennium
4. Unununnium
1. Ununoctium
2. Ununennium
3. Unnilennium
4. Unununnium
Subtopic: Modern Periodic Table & Periodicity |
83%
Level 1: 80%+
NEET - 2022
Hints
Which statement regarding polymers is not correct?
| 1. | Thermosetting polymers are reusable |
| 2. | Elastomers have polymer chains held together by weak intermolecular forces |
| 3. | Fibers possess high tensile strength |
| 4. | Thermoplastic polymers are capable of repeatedly softening and hardening on heating and cooling respectively |
Subtopic: Classification - Methods of Polymerization & Copolymerization |
68%
Level 2: 60%+
NEET - 2022
Hints
Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
1. Statement I is incorrect but Statement II is correct
2. Both Statement I and Statement II are correct
3. Both Statement I and Statement II are incorrect
4. Statement I is correct but Statement II is incorrect
| Statement I: | The boiling points of the following hydrides of group 16 elements increase in the order \(\mathrm{H}_{2} \mathrm{O}<\mathrm{H}_{2} \mathrm{~S}<\mathrm{H}_{2} \mathrm{Se}<\mathrm{H}_{2} \mathrm{Te} \) |
| Statement II: | The boiling points of these hydrides increase with the increase in molar mass. |
1. Statement I is incorrect but Statement II is correct
2. Both Statement I and Statement II are correct
3. Both Statement I and Statement II are incorrect
4. Statement I is correct but Statement II is incorrect
Subtopic: Group 16 - Preparation, Properties & Uses |
Level 3: 35%-60%
NEET - 2022
Hints
Which of the following species will exhibit the maximum lone pair–lone pair electron repulsions?
1. \(\mathrm{XeF_2}\)2. \(\mathrm{ClF_3}\)
3. \(\mathrm{IF_5}\)
4. \(\mathrm{SF_4}\)
Subtopic: V.S.E.P.R & V.B.T |
77%
Level 2: 60%+
NEET - 2022
Hints
For a first-order reaction A \(\rightarrow\) Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the reaction in min-1 is
| 1. | 0.2303 | 2. | 1.3818 |
| 3. | 0.9212 | 4. | 0.4606 |
Subtopic: First Order Reaction Kinetics |
72%
Level 2: 60%+
NEET - 2022
Hints
Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating?
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Name Reaction |
54%
Level 3: 35%-60%
NEET - 2022
Hints
In the neutral or faintly alkaline medium, \(KMnO_4 \) oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from:
| 1. | +6 to +5 | 2. | +7 to +4 |
| 3. | +6 to +4 | 4. | +7 to +3 |
Subtopic: d-Block Elements- Properties & Uses |
74%
Level 2: 60%+
NEET - 2022
Hints
Compound X on reaction with \(O_3\) followed by \(\mathrm{Zn/ H_2O}\) gives formaldehyde and 2-methyl propanal as products. The compound X is:
| 1. | Pent-2-ene | 2. | 3-Methylbut-1-ene |
| 3. | 2-Methylbut-1-ene | 4. | 2-Methylbut-2-ene |
Subtopic: Alkanes, Alkenes and Alkynes - Chemical Properties |
73%
Level 2: 60%+
NEET - 2022
Hints
For the reaction \(3 \mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{O}_{3}(\mathrm{g}) \) at 298 K, \(\text K_c\) is found to be \(3.0 \times 10^{-59} \). If the concentration of \(\text O_2\) at equilibrium is 0.040 M, then the concentration of \(\text O_3 \) in M is:
1. \(1.2 \times 10^{21} \)
2. \(4.38 \times 10^{-32} \)
3. \(1.9 \times 10^{-63} \)
4. \(2.4 \times 10^{31} \)
Subtopic: Introduction To Equilibrium |
69%
Level 2: 60%+
NEET - 2022
Hints
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