Q. No.Consider the following data of compounds:
Which of the following represents a correct set of compounds having an equal number of atoms?
1. B, C, and D only
2. B, D, and E only
3. A, B, and C only
4. A, B, and D only
| A. | \(212 ~g ~\text{of}~Na_2CO_3 (s) \text{[molar mass}=106 ~g]\) |
| B. | \(~248 g ~\text{of}~ {Na}_2 \mathrm{O}({s}) [\text{molar mass} =62 \mathrm{~g} ]\) |
| C. | \(240 g ~\text{of} ~NaOH (s)~ [\text{molar mass} =40 \mathrm{~g} \) |
| D. | \( 12 g~ \text{of}~ \mathrm{H}_2(\mathrm{~g})[ \text{molar mass} =2 \mathrm{~g}].\) |
| E. | \( 220 g~ \text{of} ~\mathrm{CO}_2(\mathrm{~g})[\text{ molar mass }=44 \mathrm{~g}]\) |
1. B, C, and D only
2. B, D, and E only
3. A, B, and C only
4. A, B, and D only
Subtopic: Moles, Atoms & Electrons |
57%
Level 3: 35%-60%
NEET - 2025
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Please attempt this question first.
Which of the following contains the highest number of helium atoms?
1. 4 u of helium
2. 4 g of helium
3. 2.27 L of helium at STP
4. 4 mol of helium
1. 4 u of helium
2. 4 g of helium
3. 2.27 L of helium at STP
4. 4 mol of helium
Subtopic: Moles, Atoms & Electrons |
78%
Level 2: 60%+
NEET - 2024
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1.0 g of \(H_2\) has same number of molecules as in:
| 1. | 14 g of \(N_2\) | 2. | 18 g of \(H_2O\) |
| 3. | 16 g of CO | 4. | 28 g of \(N_2\) |
Subtopic: Moles, Atoms & Electrons |
81%
Level 1: 80%+
NEET - 2024
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Match List-I with List-II:
| List-I (Quantities) |
List-II (Corresponding Values) |
||
| (a) | 4.48 litres of O2 at STP | (i) | 0.2 mole |
| (b) | 12.022 × 1022 molecules of H2O | (ii) | 12.044 × 1023 molecules |
| (c) | 96 g of O2 | (iii) | 6.4 g |
| (d) | 88 g of CO2 | (iv) | 67.2 litres at STP |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iii) | (iv) | (ii) |
| 2. | (iii) | (i) | (iv) | (ii) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (iii) | (i) | (ii) | (iv) |
Subtopic: Moles, Atoms & Electrons |
50%
Level 3: 35%-60%
NEET - 2022
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What fraction of Fe exists as Fe(III) in Fe0.96O?
(Consider Fe0.96 to be made up of Fe(II) and Fe(III) only)
1. \(\dfrac{1}{12}\)
2. \(0.08\)
3. \(\dfrac{1}{16}\)
4. \(\dfrac{1}{20}\)
(Consider Fe0.96 to be made up of Fe(II) and Fe(III) only)
1. \(\dfrac{1}{12}\)
2. \(0.08\)
3. \(\dfrac{1}{16}\)
4. \(\dfrac{1}{20}\)
Subtopic: Moles, Atoms & Electrons |
Level 3: 35%-60%
NEET - 2022
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Which of the following contains the maximum number of atoms ?
| 1. | 1 g of Mg(s) | 2. | 1 g of O2 (g) |
| 3. | 1 g of Li(s) | 4. | 1 g of Ag(s) |
Subtopic: Moles, Atoms & Electrons |
79%
Level 2: 60%+
NEET - 2020
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One mole of carbon atom weights 12 g, the number of atoms in it is equal to:
(Mass of carbon – 12 is )
| 1. | 2. | ||
| 3. | 4. |
|
Subtopic: Moles, Atoms & Electrons |
80%
Level 1: 80%+
NEET - 2020
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The maximum number of water molecules among the following is:
1. 18 mL of water
2. 0.18 g of water
3. 0.00224 L water vapours at 1 atm and 273 K
4. 10-3 mol of water
1. 18 mL of water
2. 0.18 g of water
3. 0.00224 L water vapours at 1 atm and 273 K
4. 10-3 mol of water
Subtopic: Moles, Atoms & Electrons |
59%
Level 3: 35%-60%
NEET - 2018
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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 the:
| 1. | Definition of mass in units of grams |
| 2. | Mass of one mole of carbon |
| 3. | Coefficient of chemical species in a balanced equation |
| 4. | Ratio of elements in a compound |
Subtopic: Moles, Atoms & Electrons |
73%
Level 2: 60%+
NEET - 2015
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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 |
79%
Level 2: 60%+
NEET - 2015
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