In the reaction given below, the product "X" is :
\(\mathrm{Na_2B_4O_7\xrightarrow{\text{ heat }~~}X+NaBO_2 }\)
\(\mathrm{Na_2B_4O_7\xrightarrow{\text{ heat }~~}X+NaBO_2 }\)
| 1. | H3BO3 | 2. | B2O3 |
| 3. | Na2B2O5 | 4. | NaB3O5 |
Subtopic: Compounds of Boron- Preparations, Properties & Uses |
62%
Level 2: 60%+
NEET - 2022
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The correct order of first ionization enthalpy for the given four element is:
| 1. | C < N < F < O | 2. | C < N < O < F |
| 3. | C < O < N < F | 4. | C < F < N < O |
Subtopic: Ionization Energy (IE) |
78%
Level 2: 60%+
NEET - 2022
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If 0.01 M acetic acid solution is 1% ionised, then pH of this acetic acid solution is:
| 1. | 3 | 2. | 2 |
| 3. | 4 | 4. | 1 |
Subtopic: pH calculation |
71%
Level 2: 60%+
NEET - 2022
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What can be the empirical formula of a compound, if it contains 51.9% carbon, 4.86% hydrogen, and 43.2% bromine by mass?
| 1. | \(\text{C}_7\text{H}_5\text{Br}\) | 2. | \(\text{C}_6\text{H}_4\text{Br}_3\) |
| 3. | \(\text{C}_8\text{H}_9\text{Br}\) | 4. | \(\text{C}_{12}\text{H}_{22}\text{Br}\) |
Subtopic: Empirical & Molecular Formula |
68%
Level 2: 60%+
Please attempt this question first.
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Please attempt this question first.
The half-life of a first-order reaction is 2000 years. If the concentration after 8000 years is 0.02 M, then the initial concentration was:
1. 0.16 M
2. 0.32 M
3. 0.08 M
4. 0.04 M
1. 0.16 M
2. 0.32 M
3. 0.08 M
4. 0.04 M
Subtopic: First Order Reaction Kinetics |
62%
Level 2: 60%+
NEET - 2022
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Determine \(\Delta U\) for the process where, one mole of an ideal gas at 300 K is expanded isothermally from 1 L to 10 L volume:
(Use R = 8.314 J K–1 mol–1)
(Use R = 8.314 J K–1 mol–1)
| 1. | 1260 J | 2. | 2520 J |
| 3. | 5040 J | 4. | 0 J |
Subtopic: First Law of Thermodynamics |
80%
Level 1: 80%+
NEET - 2022
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What is the hybridization shown by C1 and C2 carbons, respectively in the given compound?
\(\mathrm{ OHC-CH=CH-{^2}CH_2-{^1}COOCH_3}\)
\(\mathrm{ OHC-CH=CH-{^2}CH_2-{^1}COOCH_3}\)
| 1. | sp2 and sp3 | 2. | sp2 and sp2 |
| 3. | sp3 and sp2 | 4. | sp3 and sp3 |
Subtopic: Hybridisation & Structure of Carbon Compounds |
67%
Level 2: 60%+
NEET - 2022
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The mass of a 2.5 mL solution (the density of the solution is 2.15 g/mL) in the correct significant figures is:
| 1. | 5375 × 10–3 g | 2. | 5.4 g |
| 3. | 5.38 g | 4. | 53.75 g |
Subtopic: Introduction |
73%
Level 2: 60%+
NEET - 2022
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Fluorine is known to be a stronger oxidizing agent than chlorine. Which of the following thermodynamic factors is the primary reason for this behavior?
| (a) |
The F–F bond has a low bond dissociation enthalpy. |
| (b) |
The fluoride ion (F⁻) has a high hydration enthalpy in aqueous solution. |
| (c) | The electron gain enthalpy of fluorine is less negative than that of chlorine. |
| (d) | Fluorine has a very small atomic size. |
Choose the most appropriate answer from the options given :
| 1. | (a) and (b) only | 2. | (a) and (c) only |
| 3. | (a) and (d) only | 4. | (b) and (c) only |
Subtopic: Group 17 - Preparation, Properties & Uses |
Level 3: 35%-60%
NEET - 2022
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Match List-I with List-II:
Choose the correct answer from the options given below:
| List-I (Complexes) | List-II (Type of isomer) | ||
| A. | [Co(NH3)5NO2]Cl2 and [Co(NH3)5ONO]Cl2 |
I. | Ionisation isomerism |
| B. | [Cr(NH3)6] [Co(CN)6] and [Cr(CN)6][Co(NH3)6] |
II. | Coordination isomerism |
| C. | [Co(NH3)5(SO4)]Br and [Co(NH3)5Br]SO4 |
III. | Linkage isomerism |
| D. | [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2.H2O |
IV. | Solvate isomerism |
| (A) | (B) | (C) | (D) | |
| 1. | (III) | (I) | (II) | (IV) |
| 2. | (II) | (III) | (IV) | (I) |
| 3. | (III) | (II) | (I) | (IV) |
| 4. | (IV) | (III) | (II) | (I) |
Subtopic: Isomerism in Coordination Compounds |
88%
Level 1: 80%+
NEET - 2022
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