If radius of second Bohr orbit of the \(He^+\) ion is 105.8 pm, what is the radius of third Bohr orbit of \(Li^{2+}\) ion?
| 1. | 158.7 Å | 2. | 158.7 pm |
| 3. | 15.87 pm | 4. | 1.587 pm |
Subtopic: Hydrogen Spectra |
78%
Level 2: 60%+
NEET - 2022
Hints
The pollution due to oxides of sulphur gets enhanced due to the presence of :
a. particulate matter
b. ozone
c. hydrocarbons
d. hydrogen peroxide
Choose the most appropriate answer from the options given below:
1. a, c, d only
2. a, d only
3. a , b, d only
4. b, c, d only
a. particulate matter
b. ozone
c. hydrocarbons
d. hydrogen peroxide
Choose the most appropriate answer from the options given below:
1. a, c, d only
2. a, d only
3. a , b, d only
4. b, c, d only
Subtopic: Air Pollution - Ozone |
Level 3: 35%-60%
NEET - 2022
Hints
A 10.0 L flask contains 64 g of oxygen at 27°C. (Assume \(O_2\) gas is behaving ideally). The pressure inside the flask in the bar is:
(Given R = 0.0831 L bar K-1 mol-1)
1. 4.9
2. 2.5
3. 498.6
4. 49.8
(Given R = 0.0831 L bar K-1 mol-1)
1. 4.9
2. 2.5
3. 498.6
4. 49.8
Subtopic: Ideal Gas Law |
71%
Level 2: 60%+
NEET - 2022
Hints
The correct IUPAC name of the following compound is :
1. 6-Bromo-4-methyl-2-chlorohexan-4-ol
2. 1-Bromo-5-chloro-4-methylhexan-3-ol
3. 6-Bromo-2-chloro-4-methylhaxan-4-ol
4. 1-Bromo-4-methyl-5-chorohexan-3-ol
1. 6-Bromo-4-methyl-2-chlorohexan-4-ol
2. 1-Bromo-5-chloro-4-methylhexan-3-ol
3. 6-Bromo-2-chloro-4-methylhaxan-4-ol
4. 1-Bromo-4-methyl-5-chorohexan-3-ol
Subtopic: Nomenclature |
75%
Level 2: 60%+
NEET - 2022
Hints
Given below are two statements:
In light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | In Lucas test, primary, secondary, and tertiary alcohols are distinguished on the basis of their reactivity with conc. \(HCl + ZnCl_2\), known as Lucas Reagent. |
| Statement II: | Primary alcohols are most reactive and immediately produce turbidity at room temperature on reaction with Lucas Reagent. |
| 1. | I is incorrect but II is correct |
| 2. | Both I and II correct |
| 3. | Both I and II are incorrect |
| 4. | I is correct but II is incorrect |
Subtopic: Alcohols: Preparation & Properties |
82%
Level 1: 80%+
NEET - 2022
Hints
The order of energy absorbed, which is responsible for the color of complexes, is:
\((A) \ \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}(\text { en })_{2}\right]^{2+}\)
\( (B) \ \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}(\mathrm{en})\right]^{2+} \)\( (C) \ \left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}\)
\((A) \ \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}(\text { en })_{2}\right]^{2+}\)
\( (B) \ \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}(\mathrm{en})\right]^{2+} \)\( (C) \ \left[\mathrm{Ni}(\mathrm{en})_{3}\right]^{2+}\)
| 1. | B > A > C | 2. | A > B > C |
| 3. | C > B > A | 4. | C > A > B |
Subtopic: VBT, CFT & their Limitations |
66%
Level 2: 60%+
NEET - 2022
Hints
Copper crystallises in fcc unit cell with a cell edge length of \(3.608 \times 10^{-8}\) cm. The density of copper is \(8.92 \ g ~cm^{-3}\). The atomic mass of copper is:
1. 65 u
2. 63.1 u
3. 31.55 u
4. 60 u
1. 65 u
2. 63.1 u
3. 31.55 u
4. 60 u
Subtopic: Density & Packing Fraction |
68%
Level 2: 60%+
NEET - 2022
Hints
Find the emf of the cell in which the following reaction takes place at 298 K:
\(\mathrm{Ni}(\mathrm{s})+2 \mathrm{Ag}^{+}(0.001 \mathrm{M}) \rightarrow \mathrm{Ni}^{2+}(0.001 \mathrm{M})+2 \mathrm{Ag}(\mathrm{s}) \)
\(\small{\text { (Given that } \mathrm{E}_{\text {cell }}^{\circ}=1.05 \mathrm{~V}; \dfrac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059} )\)
| 1. | 1.05 V | 2. | 1.0385 V |
| 3. | 1.385 V | 4. | 0.9615 V |
Subtopic: Nernst Equation |
51%
Level 3: 35%-60%
NEET - 2022
Hints
Match List-I with List-II
Choose the correct answer from the options given below:
| List- I (ores) | List- II (Composition) |
| (a) Haematite | (i) \(Fe_3O_4\) |
| (b) Magnetite | (ii) \(ZnCO_3\) |
| (c) Calamine | (iii) \(Fe_2O_3\) |
| (d) Kaolinite | (iv) \([Al_2(OH)_4Si_2O_5]\) |
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iii) | (ii) | (iv) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (iii) | (i) | (ii) | (iv) |
| 4. | (iii) | (i) | (iv) | (ii) |
Subtopic: Intro - Flux, Leaching, Roasting & Calcination |
72%
Level 2: 60%+
NEET - 2022
Hints
Subtopic: Diazonium Salts: Preparation, Properties & Uses | Mechanism |
76%
Level 2: 60%+
NEET - 2022
Hints
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