Which one is an example of heterogeneous catalysis?
| 1. | Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron. |
| 2. | Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen. |
| 3. | Hydrolysis of sugar catalysed by H+ ions. |
| 4. | Decomposition of ozone in presence of nitrogen monoxide. |
Subtopic: Catalyst |
53%
Level 3: 35%-60%
NEET - 2023
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The following compound would be classified as:
| 1. | Vinylic halide | 2. | Benzylic halide |
| 3. | Aryl halide | 4. | Allylic halide |
Subtopic: Introduction and Physical Properties |
69%
Level 2: 60%+
NEET - 2023
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In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with \(\text{Fe}^{3+}\) due to the formation of:
1. \([\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
2. \(\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3 \cdot \mathrm{xH}_2 \mathrm{O} \)
3. \(\mathrm{NaSCN} \)
4. \(\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]^{4-} \)
1. \([\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
2. \(\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3 \cdot \mathrm{xH}_2 \mathrm{O} \)
3. \(\mathrm{NaSCN} \)
4. \(\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]^{4-} \)
Subtopic: Qualitative Analysis of Organic Compounds |
67%
Level 2: 60%+
NEET - 2023
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Subtopic: Polymers: Natural & Synthetic, Biodegradable & Non Biodegradable |
56%
Level 3: 35%-60%
NEET - 2023
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Given below are two statements:
| Assertion (A): | In the equation, \(\Delta_{\mathrm{r}} \mathrm{G}=-\mathrm{nFE} _{\text {cell }}, \) value of \(\mathrm{\Delta_rG }\) depends on n. |
| Reason (R): | \(\mathrm{E_{cell} }\) is an intensive property and \(\mathrm{\Delta_rG }\) is an extensive property. |
| 1. | (A) is False, but (R) is True. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are True and (R) is not the correct explanation of (A). |
| 4. | (A) is True, but (R) is False. |
Subtopic: Relation between Emf, G, Kc & pH |
59%
Level 3: 35%-60%
NEET - 2023
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A compound is formed by two elements A and B. The element B forms cubic close-packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is \(A_x B_y \) then the value of x+y is in option
1. 2
2. 5
3. 4
4. 3
1. 2
2. 5
3. 4
4. 3
Subtopic: Density & Packing Fraction |
53%
Level 3: 35%-60%
NEET - 2023
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Given the following five species:
\(\mathrm{NH}_3, \mathrm{AlCl}_3, \mathrm{BeCl}_2, \mathrm{CCl}_4, \mathrm{PCl}_5 \)
The total number of these species that do not have eight electrons around the central atom in its/their outermost shell, is/are:
\(\mathrm{NH}_3, \mathrm{AlCl}_3, \mathrm{BeCl}_2, \mathrm{CCl}_4, \mathrm{PCl}_5 \)
The total number of these species that do not have eight electrons around the central atom in its/their outermost shell, is/are:
| 1. | One | 2. | Three |
| 3. | Two | 4. | Four |
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
62%
Level 2: 60%+
NEET - 2023
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Which of the following statements is NOT correct?
Choose the most appropriate answer from the options given below:
| A. | Hydrogen is used to reduce heavy metal oxides to metals. |
| B. | Heavy water is used to study the reaction mechanism. |
| C. | Hydrogen is used to make saturated fats from oils. |
| D. | The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element. |
| E. | Hydrogen reduces oxides of metals that are more active than iron. |
| 1. | A, B, C only | 2. | B, C, D, E only |
| 3. | B, D only | 4. | D, E only |
Subtopic: Preparation & Properties |
Level 3: 35%-60%
NEET - 2023
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Subtopic: Diazonium Salts: Preparation, Properties & Uses |
57%
Level 3: 35%-60%
NEET - 2023
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The conductivity of centimolar solution of KCl at 25°C is 0.0210 ohm–1 cm–1 and the resistance of the cell containing the solution at 25°C is 60 ohm. The value of the cell constant is:
| 1. | 3.34 cm–1 | 2. | 1.34 cm–1 |
| 3. | 3.28 cm–1 | 4. | 1.26 cm–1 |
Subtopic: Conductance & Conductivity |
83%
Level 1: 80%+
NEET - 2023
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