How are edge length 'a' of the unit cell and radius 'r' of the sphere related to each other in ccp structure?
(Choose correct option for your answer)
(Choose correct option for your answer)
| 1. | \(a = 2r\) | 2. | \(a = r /2\sqrt2\) |
| 3. | \(a = 4r /\sqrt3\) | 4. | \(a = 2\sqrt2r\) |
Subtopic: Density & Packing Fraction |
Level 3: 35%-60%
NEET - 2023
Hints
Subtopic: Name Reaction |
77%
Level 2: 60%+
NEET - 2023
Hints
Given below are two statements:
1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false
| Statement I: | In an organic compound, when inductive and electromeric effects operate in opposite directions, the inductive effect predominates. |
| Statement II: | Hyperconjugation is observed in o-xylene. |
1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false
Subtopic: Electron Displacement Effects |
Level 3: 35%-60%
NEET - 2023
Hints
The molar conductance of a solution, given its conductivity (0.248 S m–1) and concentration (0.2 mol m–3) is:
| 1. | 0.124 S cm2 mol–1 | 2. | 1.24 S m2 mol–1 |
| 3. | 124 S cm2 mol–1 | 4. | 124 S m2 mol–1 |
Subtopic: Conductance & Conductivity |
Level 3: 35%-60%
NEET - 2023
Hints
Given below are two statements:
| Assertion (A): | Ionisation enthalpies of early actinoids are lower than early lanthanoids. |
| Reason (R): | Electrons entering 5f orbitals in actinoids experience greater shielding from the nuclear charge. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: f-Block Elements- Properties & Uses |
Level 3: 35%-60%
NEET - 2023
Hints
Consider the following reaction:
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g); ~\Delta_rH^\circ = -483.64~ kJ }\)
What is the enthalpy change (in KJ) for the decomposition of one mole of water?
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g); ~\Delta_rH^\circ = -483.64~ kJ }\)
What is the enthalpy change (in KJ) for the decomposition of one mole of water?
| 1. | 120.9 | 2. | 241.82 |
| 3. | 18 | 4. | 100 |
Subtopic: Thermochemistry |
89%
Level 1: 80%+
NEET - 2023
Hints
Which statement is not true about photochemical smog?
| 1. | Photochemical smog is harmful to humans but has no effect on plants. |
| 2. | Plants like Pinus, Juniparus can help in reducing the photochemical smog. |
| 3. | Photochemical smog occurs in warm, dry, and sunny climates. |
| 4. | Common components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde, and peroxyacetyl nitrate. |
Subtopic: Air Pollution - Smog |
50%
Level 3: 35%-60%
NEET - 2023
Hints
Which of the following aqueous solutions of electrolytes will exhibit the least elevation in boiling point?
| 1. | 0.05 M NaCl | 2. | 0.1 M KCl |
| 3. | 0.1 M MgSO4 | 4. | 0.1 M NaCl |
Subtopic: Van’t Hoff Factor |
80%
Level 1: 80%+
NEET - 2023
Hints
Subtopic: Chemical Properties |
59%
Level 3: 35%-60%
NEET - 2023
Hints
Subtopic: Alcohols: Preparation & Properties | Mechanism of Dehydration, Methanol & Ethanol |
65%
Level 2: 60%+
NEET - 2023
Hints
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