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Q. No.Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. If 0.1 mole of XY2 weighs 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weight of X and Y respectively, will be:
1. 40, 30
2. 60, 40
3. 20, 30
4. 30, 20
1. 40, 30
2. 60, 40
3. 20, 30
4. 30, 20
Subtopic: Equation Based Problem |
78%
From NCERT
NEET - 2016
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The mass of CO2 produced by heating 20 g of 20% pure limestone as per the equation given below is:
\(\mathrm{CaCO}_3(\mathrm{~s}) \xrightarrow{\text { heat }} \mathrm{CaO}(s)+\mathrm{CO}_2(\mathrm{~g})\)
\(\mathrm{CaCO}_3(\mathrm{~s}) \xrightarrow{\text { heat }} \mathrm{CaO}(s)+\mathrm{CO}_2(\mathrm{~g})\)
| 1. | 1.32 g | 2. | 1.12 g |
| 3. | 1.76 g | 4. | 2.64 g |
Subtopic: Equation Based Problem |
75%
From NCERT
NEET - 2023
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Match the following:
| Column-I | Column-II | ||
| A. | 88 g of CO2 | 1. | 0.25 mol |
| B. | 6.022×1023 molecules of H2O | 2. | 2 mol |
| C. | 5.6 L of O2 at STP | 3. | 3 mol |
| D. | 96 g of O2 | 4. | 1 mol |
| A | B | C | D | |
| 1. | 2 | 4 | 1 | 3 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Moles, Atoms & Electrons |
92%
From NCERT
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The number of water molecules are maximum in:
1. 18 molecules of water
2. 1.8 g of water
3. 18 g of water
4. 18 moles of water
1. 18 molecules of water
2. 1.8 g of water
3. 18 g of water
4. 18 moles of water
Subtopic: Moles, Atoms & Electrons |
78%
From NCERT
NEET - 2015
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When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), both at STP, the moles of HCl(g) formed is equal to:
1. 1 mol of HCl(g)
2. 2 mol of HCl(g)
3. 0.5 mol of HCl(g)
4. 1.5 mol of HCl(g)
Subtopic: Moles, Atoms & Electrons |
72%
From NCERT
AIPMT - 2014
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The number of significant figures in the numbers 5005, 500.0, and 126,000 are, respectively:
1. 2, 4, and 3
2. 4, 1, and 3
3. 4, 4, and 6
4. 4, 4, and 3
1. 2, 4, and 3
2. 4, 1, and 3
3. 4, 4, and 6
4. 4, 4, and 3
Subtopic: Introduction |
59%
From NCERT
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If Avogadro number \(N_{A}\), is changed from \(6 . 022 \times \left(10\right)^{23}\)\(\text{mol}^{- 1}\) to \(6 . 022 \times \left(10\right)^{20} ~\text{mol}^{- 1}\) this would change:
| 1. | The definition of mass in units of grams |
| 2. | The mass of one mole of carbon |
| 3. | The ratio of chemical species to each other in a balanced equation |
| 4. | The ratio of elements to each other in a compound |
Subtopic: Moles, Atoms & Electrons |
73%
From NCERT
NEET - 2015
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20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g of magnesium oxide.
The percentage purity of magnesium carbonate in the sample is:
(Atomic weight of Mg=24)
| 1. | 75 | 2. | 96 |
| 3. | 60 | 4. | 84 |
Subtopic: Limiting Reagent |
68%
From NCERT
NEET - 2015
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The weight of 70 % HNO3 concentrated nitric acid solution that should be used to prepare 250 mL of 2.0 M HNO3 is:
1. 90.0 g conc. HNO3
2. 70.0 g conc. HNO3
3. 54.0 g conc. HNO3
4. 45.0 g conc. HNO3
2. 70.0 g conc. HNO3
3. 54.0 g conc. HNO3
4. 45.0 g conc. HNO3
Subtopic: Concentration Based Problem |
66%
From NCERT
AIPMT - 2013
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Which of the following is dependent on temperature?
| 1. | Molarity | 2. | Mole fraction |
| 3. | Weight percentage | 4. | Molality |
Subtopic: Concentration Based Problem |
82%
From NCERT
NEET - 2017
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