What is the pH of a solution prepared by mixing equal volumes (50 mL each) of 0.10 M sodium acetate and 0.01 M acetic acid?
[Given pKa of CH3COOH = 4.57]
1. 2.57
2. 5.57
3. 3.57
4. 4.57
Subtopic: pH calculation |
66%
Level 2: 60%+
NEET - 2022
Hints
Which one is not the correct mathematical equation for Dalton's Law of partial pressure?
(Here p = total pressure of a gaseous mixture)
(Here p = total pressure of a gaseous mixture)
| 1. | \(p_i=\chi_ip^o_i,\) where \(\chi_i=\) mole fraction of \(i^\text{th}\) gas in a gaseous mixture \(p_{i}^{o}=\) pressure of \(i^\text{th}\) gas in a pure state |
| 2. | \(\mathrm{p}=\mathrm{p}_{1}+\mathrm{p}_{2}+\mathrm{p}_{3} \) |
| 3. | \(\mathrm{p}=\mathrm{n}_{1} \frac{\mathrm{RT}}{\mathrm{V}}+\mathrm{n}_{2} \frac{\mathrm{RT}}{\mathrm{V}}+\mathrm{n}_{3} \frac{\mathrm{RT}}{\mathrm{V}}\) |
| 4. | \(\mathrm{p}_{i}=\chi_{i} \mathrm{p} \), where \(\mathrm{p}_{i}=\) partial pressure of \(i^\text{th}\) gas \(\chi_i=\) mole fraction of \(i^\text{th}\) gas in a gaseous mixture |
Subtopic: Dalton's Law |
56%
Level 3: 35%-60%
NEET - 2022
Hints
The incorrect statement regarding enzymes is:
| 1. | Enzymes are very specific for a particle reaction and substrate. |
| 2. | Enzymes are biocatalysts. |
| 3. | Like chemical catalysts, enzymes reduce the activation energy of bio processes. |
| 4. | Enzymes are polysaccharides. |
Subtopic: Catalyst |
79%
Level 2: 60%+
NEET - 2022
Hints
Match List-I with List-II.
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (a) | Li | (i) | absorbent for carbon dioxide |
| (b) | Na | (ii) | electrochemical cells |
| (c) | KOH | (iii) | coolant in fast breeder reactors |
| (d) | Cs | (iv) | photoelectric cell |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (i) | (iv) |
| 2. | (iv) | (i) | (iii) | (ii) |
| 3. | (iii) | (iv) | (ii) | (i) |
| 4. | (i) | (iii) | (iv) | (ii) |
Subtopic: Preparations, Properties & Uses of S Block Elements |
77%
Level 2: 60%+
NEET - 2022
Hints
Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | Primary aliphatic amines react with HNO2 to give unstable diazonium salts. |
| Statement II: | Primary aromatic amines react with HNO2 to form diazonium salts which are stable even above 300 K. |
| 1. | Statement I is incorrect but Statement II is correct |
| 2. | Both Statement I and II are correct |
| 3. | Both Statement I and II are incorrect |
| 4. | Statement I is correct but Statement II is incorrect |
Subtopic: Diazonium Salts: Preparation, Properties & Uses |
53%
Level 3: 35%-60%
NEET - 2022
Hints
Which of the following is suitable to synthesize chlorobenzene?
| 1. |  |
| 2. | Benzene, Cl2, anhydrous FeCl3 |
| 3. | Phenol, NaNO2, HCl, CuCl |
| 4. |  |
Subtopic: Haloarenes: Directive Influence of Halogen |
68%
Level 2: 60%+
NEET - 2022
Hints
Identify the incorrect statement from the following:
| 1. | Lithium is the strongest reducing agent among the alkali metals. |
| 2. | Alkali metals react with water to form their hydroxides. |
| 3. | The oxidation number of K in KO2 is +4. |
| 4. | Ionisation enthalpy of alkali metals decreases from top to bottom in the group. |
Subtopic: Introduction to Redox and Oxidation Number |
68%
Level 2: 60%+
NEET - 2022
Hints
Subtopic: Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |
75%
Level 2: 60%+
NEET - 2022
Hints
At \(298 {~K},\) the standard electrode potentials of \(\mathrm{{Cu}^{2+} /{Cu},}\) \(\mathrm{{Zn}^{2+} / {Zn},~~ {Fe}^{2+} / {Fe}}\) and \(\mathrm{{Ag}^{+} / {Ag}} \) are \(\mathrm{0.34 {~V}, -0.76 {~V},}\) \(\mathrm{-0.44 {~V}}\) and \(\mathrm{0.80 {~V},}\) respectively.
On the basis of standard electrode potentials, predict which of the following reaction can not occur?
On the basis of standard electrode potentials, predict which of the following reaction can not occur?
| 1. | \(\mathrm{2 {CuSO}_{4}({aq})+2 {Ag}({s}) → 2 {Cu}({s})+{Ag}_{2} {SO}_{4}({aq})} \) |
| 2. | \(\mathrm{{CuSO}_{4}({aq})+{Zn}({s})} \) \(\mathrm{→ {ZnSO}_{4}({aq})+{Cu}({s})} \) |
| 3. | \(\mathrm{{CuSO}_{4}({aq})+{Fe}({s})} \) \(\mathrm{→ {FeSO}_{4}({aq})+{Cu}({s})} \) |
| 4. | \(\mathrm{{FeSO}_{4}({aq})+{Zn}({s})} \) \(→ \mathrm{{ZnSO}_{4}({aq})+{Fe}({s})} \) |
Subtopic: Emf & Electrode Potential |
69%
Level 2: 60%+
NEET - 2022
Hints
Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| I: | The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group. |
| II: | o-Nitrophenol, m-nitrophenol and p-nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring. |
| 1. | I is incorrect but II is correct. |
| 2. | Both I and II are correct. |
| 3. | Both I and II are incorrect. |
| 4. | I is correct but II is incorrect. |
Subtopic: Phenols: Preparation & Properties |
84%
Level 1: 80%+
NEET - 2022
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