- 1(current)
Q. No.| Assertion (A): | Irrespective of the source, a given compound always contains the same elements in the same proportion. |
| Reason (R): | This law is referred to as the law of multiple proportions. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Introduction |
From NCERT
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Consider the given two statements:
Select the correct option:
| Statement I: | The law of multiple proportions is followed by the gases SO2 and SO3, but not by CO and CO2. |
| Statement II: | Dalton’s theory explains the laws of chemical combination as well as laws of gaseous volumes. |
| 1. | Statement I is correct, and Statement II is correct. |
| 2. | Statement I is incorrect, and Statement II is correct. |
| 3. | Statement I is correct, and Statement II is incorrect. |
| 4. | Statement I is incorrect, and Statement II is incorrect. |
Subtopic: Introduction |
From NCERT
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At constant T and P, 5.0 L of SO2 is reacted with 3.0 L of O2 according to the following equation:
2SO2(g) + O2(g) → 2SO3(g)
The volume of the remaining reaction mixture at the completion of the reaction will be:
1. 0.5 L
2. 8.0 L
3. 5.5 L
4. 5 L
Subtopic: Introduction |
From NCERT
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Consider the given two statements:
In the light of above statements, choose the correct option from the following :
| Statement I: | 1 amu is defined as the mass exactly equal to one-twelfth of the mass of one carbon-12 atom. |
| Statement II: | Number of atoms in 8 u of He is 2NA. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct but Statement II is incorrect. |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Introduction |
From NCERT
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The vapour density of a mixture containing \(NO_{2}\) and \(N_{2} O_{4}\) is 38.3. The mole of \(NO_{2}\) in a 100 g mixture is:
[Vapour density = (Molar mass / 2)]
1. 0.437
2. 0.347
3. 0.557
4. 0.663
Subtopic: Introduction |
From NCERT
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NEET 2026 - Target Batch - Vital
Hints
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NEET 2026 - Target Batch - Vital
What will be the mass of one atom of \(^{12}C\)?
1. 1 a.m.u.
2. \(1.9923\times10^{-23}~\text{g}\)
3. \(1.6603\times10^{-22}~\text{g}\)
4. 6 a.m.u.
1. 1 a.m.u.
2. \(1.9923\times10^{-23}~\text{g}\)
3. \(1.6603\times10^{-22}~\text{g}\)
4. 6 a.m.u.
Subtopic: Moles, Atoms & Electrons | Introduction |
From NCERT
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Q. No.
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