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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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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Match List-I with List-II :
Choose the correct answer from the options given below:
1. A-III, B-I, C-IV, D-II
2. A-III, B-II, C-I, D-IV
3. A-II, B-IV, C-I, D-III
4. A-II, B-I, C-IV, D-III
| List-I (Example) |
List-II (Type of solution) |
||
| A. | Humidity | I. | Solid in solid |
| B. | Alloys | II. | Liquid in gas |
| C. | Amalgams | III. | Solid in gas |
| D. | Smoke | IV. | Liquid in solid |
1. A-III, B-I, C-IV, D-II
2. A-III, B-II, C-I, D-IV
3. A-II, B-IV, C-I, D-III
4. A-II, B-I, C-IV, D-III
Subtopic: Introduction & Colligative properties |
67%
Level 2: 60%+
NEET - 2025
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\(C(s) + 2 H_2(g) \rightarrow CH_4(g); \Delta H = -74.8~kJ mol^{-1}\)
Which of the following diagrams gives an accurate representation of the above reaction?
[R→reactants; P→products]
Which of the following diagrams gives an accurate representation of the above reaction?
[R→reactants; P→products]
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Arrhenius Equation |
60%
Level 2: 60%+
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If a Sugar ' X ' is found in honey, is a keto sugar, exists in \(\alpha\) and \(\beta\) - anomeric forms and is laevorotatory, then find out 'X':
1. Maltose
2. Sucrose
3. D-Glucose
4. D-Fructose
1. Maltose
2. Sucrose
3. D-Glucose
4. D-Fructose
Subtopic: Carbohydrates - Classification & D-L configuration |
58%
Level 3: 35%-60%
NEET - 2025
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The total number of possible isomers (both structural as well as stereoisomers)
of cyclic ethers of molecular formula \(C_4H_8O \) is :
1. 10
2. 11
3. 6
4. 8
of cyclic ethers of molecular formula \(C_4H_8O \) is :
1. 10
2. 11
3. 6
4. 8
Subtopic: Ethers: Preparation & Properties, Uses |
Level 4: Below 35%
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%
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The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes \(n=2 \rightarrow n=3\) and \(n=4 \rightarrow n=6\) transitions, respectively, is
| 1. | \(\dfrac{1}{9}\) | 2. | \(\dfrac{1}{4}\) |
| 3. | \(\dfrac{1}{36}\) | 4. | \(\dfrac{1}{16}\) |
Subtopic: Hydrogen Spectra |
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Level 2: 60%+
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If the molar conductivity \(\left(\Lambda_{\mathrm{m}}\right)\) of a \(0.050 ~\text{mol}~ \text{L}^{-1}\) solution of a monobasic weak acid is \(90 ~\text{S} ~\text{cm}^2 ~\text{mol}^{-1}\), then its degree of dissociation will be: [Assume \(\Lambda_{+}^0=349.6~ \mathrm{S ~cm}^2 \mathrm{~mol}^{-1}\) and \(\mathrm{\Lambda}_{-}^{\circ}=50.4 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1} \)]
| 1. | \( 0.225 \) | 2. | \( 0.215 \) |
| 3. | \(0.115 \) | 4. | \(0.125\) |
Subtopic: Conductance & Conductivity |
61%
Level 2: 60%+
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Which of the following is true, when \(5\) moles of liquid \(\text X\) and \(10\) moles of liquid \(\text Y\) make a solution having a vapour pressure of \(70\) torr?
[Given: The vapour pressures of pure \(\text X\) and \(\text Y\) are \(63\) torr and \(78\) torr respectively]
[Given: The vapour pressures of pure \(\text X\) and \(\text Y\) are \(63\) torr and \(78\) torr respectively]
| 1. | The solution is ideal. |
| 2. | The solution has a volume that is greater than the sum of individual volumes. |
| 3. | The solution shows positive deviation. |
| 4. | The solution shows negative deviation. |
Subtopic: Raoult's Law |
53%
Level 3: 35%-60%
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