What fraction of one edge centred octahedral void lies in one unit cell of fcc?
| 1. | \( 1 \over 12\) | 2. | \( 1 \over 2\) |
| 3. | \( 1 \over 3\) | 4. | \( 1 \over 4\) |
Subtopic: Voids, Radius Ratio & Coordination Number |
Level 3: 35%-60%
NEET - 2023
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Given below are two statements:
In the light of the above statements choose the correct 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 nutrient deficient water bodies lead to eutrophication. |
| Statement II: | Eutrophication leads to decrease in the level of oxygen in the water bodies. |
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: Water Pollution - Eutrophication |
Level 3: 35%-60%
NEET - 2023
Hints
Which amongst the following will be most readily dehydrated under acidic conditions?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Mechanism of Dehydration, Methanol & Ethanol |
53%
Level 3: 35%-60%
NEET - 2023
Hints
Match the Oxoacids of Sulphur given in List-I with the number of bonds given in List-II and mark the correct option:
Choose the correct answer from the options given below:
| List-I (Oxoacids of Sulphur) |
List-II (Bonds) |
||
| A. | Peroxodisulphuric acid | I. | Two S-OH, Four S=O, One S-O-S |
| B. | Sulphuric acid | II. | Two S-OH, One S=O |
| C. | Pyrosulphuric acid | III. | Two S-OH, Four S=O, One S-O-O-S |
| D. | Sulphurous acid | IV. | Two S-OH, Two S=O |
Choose the correct answer from the options given below:
| Options: | A | B | C | D |
| 1. | III | IV | II | I |
| 2. | I | III | II | IV |
| 3. | III | IV | I | II |
| 4. | I | III | IV | II |
Subtopic: Group 16 - Preparation, Properties & Uses |
73%
Level 2: 60%+
NEET - 2023
Hints
Identify the final product [D] obtained in the following sequence of reactions:
| 1. | \(\mathrm{HC\equiv C^-~Na^+}\) | 2. |  |
| 3. |  |
4. | \(\mathrm{C_4H_{10}}\) |
Subtopic: Aldehydes & Ketones: Preparation & Properties |
76%
Level 2: 60%+
NEET - 2023
Hints
The most stable compound, among the following, is:
1. [Co(NH3)6]2(SO4)3
2. [Co(NH3)4(H2O)Br](NO3)2
3. [Co(NH3)3(NO3)3]
4. [CoCl2(en)2]NO3
1. [Co(NH3)6]2(SO4)3
2. [Co(NH3)4(H2O)Br](NO3)2
3. [Co(NH3)3(NO3)3]
4. [CoCl2(en)2]NO3
Subtopic: Organometallic Complexes & their Uses |
69%
Level 2: 60%+
NEET - 2023
Hints
Subtopic: Ethers: Preparation & Properties, Uses |
74%
Level 2: 60%+
NEET - 2023
Hints
Which of the following statements is incorrect?
Choose the correct answer from the options given below:
| A. | All the transition metals except scandium form MO oxides which are ionic. |
| B. | The highest oxidation number corresponds to the group number in transition metal oxides is attained in Sc2O3 to Mn2O7. |
| C. | Basic character increases from V2O3 to V2O4 to V2O5. |
| D. | V2O4 dissolves in acids to give VO43-. |
| E. | CrO is basic, but Cr2O3 is amphoteric. |
| 1. | B and C only | 2. | A and E only |
| 3. | B and D only | 4. | C and D only |
Subtopic: d-Block Elements- Properties & Uses |
53%
Level 3: 35%-60%
NEET - 2023
Hints
Consider the following compounds/species:
The number of compounds/species which obey Huckel's rule is:
| i. |  |
ii. |  |
| iii. |  |
iv. |  |
| v |  |
vi |  |
| vii |  |
| 1. | 5 | 2. | 4 |
| 3. | 6 | 4. | 2 |
Subtopic: Aromatic Hydrocarbons - Nomenclature, Isomerism & Huckel's Rule |
74%
Level 2: 60%+
NEET - 2023
Hints
The reaction that does not take place in a blast furnace between 900 K to 1500 K temperature range during the extraction of iron is:
1. CaO + SiO2 → CaSiO3
2. Fe2O3 + CO → 2FeO + CO2
3. FeO + CO → Fe +CO2
4. C + CO2 → 2CO
1. CaO + SiO2 → CaSiO3
2. Fe2O3 + CO → 2FeO + CO2
3. FeO + CO → Fe +CO2
4. C + CO2 → 2CO
Subtopic: Metallurgy of individual elements |
Level 3: 35%-60%
NEET - 2023
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