Identify the Incorrect statement:
| 1. | Carbon has the tendency to form chains and rings with itself. |
| 2. | Silicon and Germanium are useful in semiconductor industry. |
| 3. | Boron trifluoride is a Lewis acid. |
| 4. | Common oxidation states of group 14 elements are +1 and +3. |
Subtopic: Structure & Properties of Allotropes of C |
80%
Level 1: 80%+
NEET - 2024
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When 5 g of non-volatile non-electrolyte solute is dissolved in 100 g of a certain solvent, the freezing point of the solvent decreases by 0.25 K. The molar mass of the solute is:
\([\text{K}_f \) of the given solvent \( =1.2 \mathrm{K ~kg}~ \mathrm{mol}^{-1}] \)
\([\text{K}_f \) of the given solvent \( =1.2 \mathrm{K ~kg}~ \mathrm{mol}^{-1}] \)
| 1. | \(242.8 \mathrm{~g} \mathrm{~mol}^{-1}\) | 2. | \(238.2 \mathrm{~g} \mathrm{~mol}^{-1}\) |
| 3. | \(241.8 \mathrm{~g} \mathrm{~mol}^{-1}\) | 4. | \(240.0 \mathrm{~g} \mathrm{~mol}^{-1}\) |
Subtopic: Depression of Freezing Point |
84%
Level 1: 80%+
NEET - 2024
Hints
What is the rate constant for a reaction if the time taken by the first-order decomposition of \(\text{SO}_2\text{Cl}_2\) to decompose to 40% is 560 seconds?
[Given: log 2.5 = 0.3979]
[Given: log 2.5 = 0.3979]
| 1. | \(2.726 \times 10^{-5} \mathrm{~min}^{-1}\) | 2. | \(2.276 \times 10^{-5} \mathrm{~min}^{-1}\) |
| 3. | \(2.216 \times 10^{-5} \mathrm{~min}^{-1}\) | 4. | None of the above |
Subtopic: First Order Reaction Kinetics |
Level 3: 35%-60%
NEET - 2024
Hints
Identify the incorrect statement:
| 1. | The relative stability of group 13 elements in +1 oxidation state varies as: Al < Ga < In < Tl. |
| 2. | Boron trioxide is acidic; aluminium and gallium trioxides are amphoteric, while indium and thallium trioxides are basic. |
| 3. | The hybridisation of Al in \(\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}\) is \(\text{d}^2\text{ sp}^3.\) |
| 4. | Two isotopes of Boron, namely \(^{10}\!\mathrm{~B}(19 \%)\) and , \(^{11}\! \mathrm{~B}(81 \%)\) are known. |
Subtopic: Boron Family- Preparations, Properties & Uses |
72%
Level 2: 60%+
NEET - 2024
Hints
Given below are two statements:
In the light of the above statements, choose the correct answer from the option given below:
| Statement I: | Benzendiazonium chloride is a colourless crystalline solid. It is insoluble in water but reacts with water when warmed. |
| Statement II: | Benzendiazonium chloride on reacting with HCI in presence of copper powder gives chlorobenzene as the product. This is an example of Gatterman reaction. |
| 1. | Both Statement I and Statement II is true. |
| 2. | Both Statement I and Statement II is false. |
| 3. | Statement I is true but Statement II is false. |
| 4. | Statement I is false but Statement II is true. |
Subtopic: Diazonium Salts: Preparation, Properties & Uses |
Level 4: Below 35%
NEET - 2024
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Subtopic: Qualitative Analysis of Organic Compounds |
74%
Level 2: 60%+
NEET - 2024
Hints
Find the amount of heat released when 35.0 g of CO₂ is formed from the combustion of carbon in dioxygen gas. Given that the enthalpy of combustion of carbon to carbon dioxide is −390.0 kJ mol⁻¹.
| 1. | \(310~\text{kJ}\) | 2. | \(490~\text{kJ}\) |
| 3. | \(245~\text{kJ}\) | 4. | \(700~\text{kJ}\) |
Subtopic: Enthalpy & Internal energy |
74%
Level 2: 60%+
NEET - 2024
Hints
For the equilibrium reaction:
2NOCl(g) ⇌ 2NO(g) + Cl₂(g)
The equilibrium constant in terms of concentration (Kc) is 3.0 × 10⁻⁶ at 1000 K.
Calculate the value of Kp for the reaction at this temperature.
| 1. | \(1.493\) | 2. | \(2.494\times10^{-2}\) |
| 3. | \(3.0\times10^{-6}\) | 4. | \(2.494\times10^{-4}\) |
Subtopic: Kp, Kc & Factors Affecting them |
77%
Level 2: 60%+
NEET - 2024
Hints
The crystal field stabilisation energy (CFSE) and the 'spin only' magnetic moment of \(\mathrm{[FeF_6]^{3-}}\) ion respectively, are:
1. \(0~\Delta~\text{and}~5.9~\text{BM}\)
2. \(0~\Delta~\text{and}~1.73~\text{BM}\)
3. \(2.0~\Delta~\text{and}~5.9~\text{BM}\)
4. \(2.0~\Delta~\text{and}~1.73~\text{BM}\)
1. \(0~\Delta~\text{and}~5.9~\text{BM}\)
2. \(0~\Delta~\text{and}~1.73~\text{BM}\)
3. \(2.0~\Delta~\text{and}~5.9~\text{BM}\)
4. \(2.0~\Delta~\text{and}~1.73~\text{BM}\)
Subtopic: VBT, CFT & their Limitations |
69%
Level 2: 60%+
NEET - 2024
Hints
In salt analysis, \(\mathrm{Cl^-,Br^-}\) and \(\mathrm{I^-}\) are identified by adding dilute \(\mathrm{HNO_3}\) followed by \(\mathrm{AgNO_3}\) solution to the salt solution. Which of the following statements are correct?
Choose the correct answer from the options given below:
| A | \(\mathrm{Cl^-}\) gives pale yellow precipitate. |
| B | \(\mathrm{Br^-}\) gives a pale yellow precipitate which is partially soluble in \(\mathrm{NH_4OH.}\) |
| C | \(\mathrm{I^-}\) gives yellow precipitate which is insoluble in \(\mathrm{NH_4OH.}\) |
| D | \(\mathrm{Cl^-}\) gives white precipitate which is insoluble in \(\mathrm{NH_4OH.}\) |
| E | \(\mathrm{I^-}\) gives purple violet gas. |
Choose the correct answer from the options given below:
| 1. | B and C only | 2. | A and B only |
| 3. | A and E only | 4. | D and E only |
Subtopic: Detection of Anions |
57%
Level 3: 35%-60%
NEET - 2024
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