Q. No.What is the mass, in grams, of a single atom of an element with an atomic mass of 10 atomic mass units (u)?
1. \(2.06056 ~\times ~ 10 ^{-22}g\)
2. \(1.66056 ~\times ~ 10 ^{-23}g\)
3. \(1.06056 ~\times ~ 10 ^{-24}g\)
4. \(3.66056 ~\times ~ 10 ^{-25}g\)
1. \(2.06056 ~\times ~ 10 ^{-22}g\)
2. \(1.66056 ~\times ~ 10 ^{-23}g\)
3. \(1.06056 ~\times ~ 10 ^{-24}g\)
4. \(3.66056 ~\times ~ 10 ^{-25}g\)
Subtopic: Moles, Atoms & Electrons |
78%
From NCERT
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224 ml of a triatomic gas weighs 1g at 273 K and 1 atm. The mass of one atom of this gas is:
1. 8.30 × 10–23 g
2. 2.08 × 10–23 g
3. 5.53 × 10–23 g
4. 6.24 × 10–23 g
Subtopic: Moles, Atoms & Electrons |
53%
From NCERT
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Elements A and B form two compounds, A₂B and AB₃, with equal weights for 0.15 moles of each compound. What is the ratio of the molar atomic mass of element A and element B?
c
c
| 1. | 2 : 1 | 2. | 6 : 4 |
| 3. | 1 : 2 | 4. | 4 : 6 |
Subtopic: Moles, Atoms & Electrons |
60%
From NCERT
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The mass of one atom of an element is 1.71×10-22g. The atomic mass of this element in g mol-1 is:
| 1. | 101 | 2. | 103 |
| 3. | 105 | 4. | 107 |
Subtopic: Moles, Atoms & Electrons |
76%
From NCERT
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One mole of oxygen gas at STP is equal to:
| (a) | 6 .022× 1023 molecules of oxygen |
| (b) | 6.022 × 1023 atoms of oxygen |
| (c) | 16 g of oxygen molecule |
| (d) | 32 g of oxygen |
Choose the correct answer from the option given below:
1. (a) and (b)2. (a) and (c)
3. (a) and (d)
4. (c) and (d)
Subtopic: Moles, Atoms & Electrons |
72%
From NCERT
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A smuggler travelling from Dubai on a not-so-reputed airline was found in possession of 19.7 kg of gold. How many atoms of gold were recovered? (Atomic mass of gold (Au) is 197 u)
1. 6.02 × 1022
2. 6.02 × 1023
3. 6.02 × 1024
4. 6.02 × 1025
1. 6.02 × 1022
2. 6.02 × 1023
3. 6.02 × 1024
4. 6.02 × 1025
Subtopic: Moles, Atoms & Electrons |
65%
From NCERT
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Mark the species among the following that contains the highest number of atoms:
1. 4 g He
1. 4 g He
2. 46 g Na
3. 0.40 g Ca
4. 12 g He
Subtopic: Moles, Atoms & Electrons |
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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%
From NCERT
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The total number of electrons present in 120 g of \(\mathrm{CO}_3^{-2} \) ion is:
| 1. | \(64 \mathrm{~N}_{\mathrm{A}}\) | 2. | \(32 \mathrm{~N}_{\mathrm{A}}\) |
| 3. | \(16 \mathrm{~N}_{\mathrm{A}}\) | 4. | \(8 \mathrm{~N}_{\mathrm{A}}\) |
Subtopic: Moles, Atoms & Electrons |
77%
From NCERT
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| (a) | 16 g of gas |
| (b) | 22.9 L of gas |
| (c) | dioxygen molecules |
| (d) | 11.2 L of gas |
The incorrect statements regarding 1 mole of dioxygen gas at STP from the above four statements are:
| 1. | (a, b and c) | 2. | (a, b and d) |
| 3. | (b, c and d) | 4. | (a, c and d) |
Subtopic: Moles, Atoms & Electrons |
70%
From NCERT
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