Which of the following statements are true?
Choose the correct answer from the options given below:
| A. | Unlike Ga that has a very high melting point, Cs has a very low melting point. |
| B. | On Pauling scale, the electronegativity values of N and Cl are not the same. |
| C. | \(Ar, K^+, Cl^-, Ca^{2+}\) and \(S^{2-}\) are all isoelectronic species. |
| D. | The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si > Al > Mg > Na |
| E. | The atomic radius of Cs is greater than that of Li and Rb. |
| 1. | C and D only | 2. | A, C and E only |
| 3. | A, B and E only | 4. | C and E only |
Subtopic: Ionization Energy (IE) | Electronegativity |
Level 3: 35%-60%
NEET - 2025
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Given below are two statements:
| Statement I: | A hypothetical diatomic molecule with bond order zero is quite stable. |
| Statement II: | As bond order increases, the bond length increases. |
| 1. | Statement I is True but Statement II is False. |
| 2. | Statement I is False but Statement II is True. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Both Statement I and Statement II are False. |
Subtopic: M.O.T |
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Level 3: 35%-60%
NEET - 2025
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Identify the correct orders against the property mentioned:
Choose the correct answer from the options given below:
| A. | \(\mathrm{H}_2 \mathrm{O}>\mathrm{NH}_3>\mathrm{CHCl}_3 -\text { }\)dipole moment |
| B. | \(\mathrm{XeF}_4>\mathrm{XeO}_3>\mathrm{XeF}_2-\text { }\)number of lone pairs on central atom |
| C. | \(\mathrm{O}-\mathrm{H}>\mathrm{C}-\mathrm{H}>\mathrm{N}-\mathrm{O}-\text { }\)bond length |
| D. | \(\mathrm{N}_2>\mathrm{O}_2>\mathrm{H}_2 \text { } -\) bond enthalpy |
| 1. | A and C only | 2. | B and C only |
| 3. | A and D only | 4. | B and D only |
Subtopic: M.O.T | Polarity | V.S.E.P.R & V.B.T |
59%
Level 3: 35%-60%
NEET - 2025
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Match List-I with List-II
Choose the correct answer from the options given below:
| List-I | List-II | ||
| A. | \(XeO_3\) | I. | \(sp^3d;\) linear |
| B. | \(XeF_2\) | II. | \(sp^3;\) pyramidal |
| C. | \(XeOF_4\) | III. | \(sp^3d^3;\) distorted octahedral |
| D. | \(XeF_6\) | IV. | \(sp^3d^2 ;\) square pyramidal |
| 1. | A-IV, B-II, C-III, D-I | 2. | A-IV, B-II, C-I, D-III |
| 3. | A-II, B-I, C-IV, D-III | 4. | A-II, B-I, C-III, D-IV |
Subtopic: V.S.E.P.R & V.B.T |
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Level 2: 60%+
NEET - 2025
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Find the standard heat of formation of Ba²⁺(aq) using the following data:
Given:
ΔH°f(SO₄²⁻, aq) = −216 kcal mol⁻¹
Heat of crystallisation of BaSO₄(s) = −4.5 kcal mol⁻¹
ΔH°f(BaSO₄, s) = −349 kcal mol⁻¹
| 1. | +133.0 | 2. | +220.5 |
| 3. | -128.5 | 4. | -133.0 |
Subtopic: Thermochemistry |
Level 3: 35%-60%
NEET - 2025
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For the reaction \(A(g) \rightleftharpoons 2B(g),\) the backward reaction rate constant is higher than the forward reaction rate constant by a factor of \(2500\) at \(1000~K \).
\(K_p\) for the reaction at \(1000~ K\) is:
[ Given: \({R= 0.0831~ L ~\text{atm mol}^{-1} }K^{-1}]\)
\(K_p\) for the reaction at \(1000~ K\) is:
[ Given: \({R= 0.0831~ L ~\text{atm mol}^{-1} }K^{-1}]\)
| 1. | \(0.033 \) | 2. | \(0.021 \) |
| 3. | \(83.1 \) | 4. | \(2 .077 \times 10^5\) |
Subtopic: Kp, Kc & Factors Affecting them |
52%
Level 3: 35%-60%
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Which of the following parameters can determine the higher yield of \(\mathrm{NO}\) in the reaction, \(\mathrm{N}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})\) ?
\([ Given: \Delta \mathrm{H}\) of the reaction \(=+180.7 \mathrm{~kJ} \mathrm{~mol}^{-1} ]\)
A. higher temperature
B. lower temperature
C. higher concentration of \(\mathrm{N}_2\)
D. higher concentration of \(\mathrm{O}_2\)
Choose the correct answer from the options given below:
1. B, C, D only
2. A, C, D only
3. A, D only
4. B, C only
\([ Given: \Delta \mathrm{H}\) of the reaction \(=+180.7 \mathrm{~kJ} \mathrm{~mol}^{-1} ]\)
A. higher temperature
B. lower temperature
C. higher concentration of \(\mathrm{N}_2\)
D. higher concentration of \(\mathrm{O}_2\)
Choose the correct answer from the options given below:
1. B, C, D only
2. A, C, D only
3. A, D only
4. B, C only
Subtopic: Le Chatelier's principle |
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Phosphoric acid ionizes in three steps, with their ionization constant values \(\mathrm{K}_{\mathrm{a}_1}, \mathrm{~K}_{\mathrm{a}_2} \text { and } \mathrm{K}_{\mathrm{a}_3} \text {, }\)respectively, while \(K\) is the overall ionization constant. Which of the following statements are true for the ionization of phosphoric acid?
Choose the correct answer from the options given below :
1. B, C and D only
2. A, B and C only
3. A and B only
4. A and C only
| A. | \(\log \mathrm{K}=\log \mathrm{K}_{\mathrm{a}_1}+\log \mathrm{K}_{\mathrm{a}_2}+\log \mathrm{K}_{\mathrm{a}_3}\) |
| B. | \(\mathrm{H}_3 \mathrm{PO}_4\) is a stronger acid than \(\mathrm{H}_2 \mathrm{PO}_4^{-}\) and \(\mathrm{HPO}_4^{2-} .\) |
| C. | \(\mathrm{K}_{a_1} >\mathrm{~K}_{\mathrm{a}_2}>\mathrm{K}_{\mathrm{a}_3} \) |
| D. | \(\mathrm{K}_{\mathrm{a}_1}=\frac{\mathrm{K}_{\mathrm{a}_3}+\mathrm{K}_{\mathrm{a}_2}}{2}\) |
1. B, C and D only
2. A, B and C only
3. A and B only
4. A and C only
Subtopic: Ionisation Constant of Acid, Base & Salt |
57%
Level 3: 35%-60%
NEET - 2025
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Consider the following compounds:
\(\underline KO_2, H_2 \underline O_2\) and \(H_2 \underline SO_4\)
The oxidation states of the underlined elements in them are, respectively:
1. +1, -2 and +4
2. +4 , -4 and +6
3. +1, -1 and +6
4. +2, -2 and +6
\(\underline KO_2, H_2 \underline O_2\) and \(H_2 \underline SO_4\)
The oxidation states of the underlined elements in them are, respectively:
1. +1, -2 and +4
2. +4 , -4 and +6
3. +1, -1 and +6
4. +2, -2 and +6
Subtopic: Introduction to Redox and Oxidation Number |
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Level 3: 35%-60%
NEET - 2025
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Match List-I with List-II:
Choose the correct answer from the option given below:
1. A-III, B-IV, C-I, D-II
2. A-III, B-IV, C-II, D-I
3. A-IV, B-III, C-I, D-II
4. A-IV, B-III, C-II, D-I
| List-I (Mixture) |
List-II (Method of Separation) |
||
| A. | \( \mathrm{CHCl}_3+ \mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2 \) | I. | Distillation under reduced pressure |
| B. | Crude oil in petroleum industry | II. | Steam distillation |
| C. | Glycerol from spent-lye | III. | Fractional distillation |
| D. | Aniline-water | Iv. | Simple distillation |
1. A-III, B-IV, C-I, D-II
2. A-III, B-IV, C-II, D-I
3. A-IV, B-III, C-I, D-II
4. A-IV, B-III, C-II, D-I
Subtopic: Purification of Organic Compounds |
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Level 2: 60%+
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