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Q. No.Which of the following has the greatest number of molecules?
1. 64 g SO2
2. 44 g CO2
3. 48 g O3
4. 8 g H2
1. 64 g SO2
Subtopic: Moles, Atoms & Electrons |
89%
From NCERT
AIPMT - 2011
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| Assertion (A): | When 4 moles of H2 reacts with 2 moles of O2, then 4 moles of water are formed. |
| Reason (R): | O2 will act as a limiting reagent. |
| 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: Equation Based Problem |
59%
From NCERT
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| Assertion (A): | The number of molecules in 2 moles of NH3 is equal to the number of molecules in 4 moles of CH4. |
| Reason (R): | Both are chemically similar species. |
| 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: Moles, Atoms & Electrons |
83%
From NCERT
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Given below are two statements:
| Assertion (A): | 1 a.m.u = 1 .66 × 10−24 gram. |
| Reason (R): | The actual mass of one atom of C-12 is equal to 1.99 × 10-23 g. |
| 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. | (A) is False but (R) is True. |
Subtopic: Moles, Atoms & Electrons |
From NCERT
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When 22.4 L of H2 (g) is mixed with 11.2 L of Cl2 (g), each at STP, the moles of HCl(g) formed is equal to -
| 1. | 1 mole of HCl (g) | 2. | 2 moles of HCl (g) |
| 3. | 0.5 mole of HCl (g) | 4. | 1.5 mole of HCl (g) |
Subtopic: Limiting Reagent |
74%
From NCERT
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Percentage of C, H & N of a compound is given as follows:
C=40%, H=13.33%, N=46.67%
The empirical formula of the compound will be:
1.
2.
3.
4.
Subtopic: Empirical & Molecular Formula |
77%
From NCERT
AIPMT - 1998
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The number of significant figures in the following numbers are:
| (I) | 161 cm |
| (II) | 0.0161 |
| (III) | 1.61 |
1. 3, 3, 3
2. 3, 4, 3
3. 3, 2, 3
4. 3, 4, 4
Subtopic: Introduction |
74%
From NCERT
AIPMT - 1998
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0.33% of iron (by weight) is present in hemoglobin (Molecular wt = 67200). The number of iron atom(s) in one molecule will be:
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Equation Based Problem |
71%
From NCERT
AIPMT - 1998
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When 1 mole of ammonia (NH₃) reacts with 1 mole of oxygen (O₂), which of the following outcomes occurs regarding the consumption of the reactants?
| 1. | Oxygen is completely consumed. |
| 2. | Ammonia is completely consumed. |
| 3. | Both oxygen (O₂) and ammonia (NH₃) are completely consumed |
| 4. | Neither oxygen (O₂) nor ammonia (NH₃) is completely consumed. |
Subtopic: Limiting Reagent |
68%
From NCERT
AIPMT - 1998
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The maximum number of molecules is present in:
| 1. | 5L of N2 gas at STP | 2. | 0.5 g of H2 gas |
| 3. | 10g of O2 gas | 4. | 15 L of H2 gas at STP |
Subtopic: Moles, Atoms & Electrons |
70%
From NCERT
AIPMT - 2004
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