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Q. No.The number of significant figures in the following numbers is:
| (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 |
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AIPMT - 1998
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If the density of the solution is 3.12 g ml-1, then what will be the mass of the 1.5 ml solution in two significant figures?
| 1. | \(4.4~\mathrm{g}\) | 2. | \(4680 \times 10^{3} ~\mathrm{g}\) |
| 3. | \(4.7~\mathrm{g}\) | 4. | \(46.80~\mathrm{g}\) |
Subtopic: Introduction |
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The correct match is:
| List I | List II |
| a. Micro | i. m |
| b. Mega | ii. m |
| c. Giga | iii. m |
| d. Femto | iv. m |
| a | b | c | d | |
| 1. | i | iv | iii | ii |
| 2. | iii | iv | ii | i |
| 3. | ii | iii | iv | i |
| 4. | i | iii | iv | ii |
Subtopic: Introduction |
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Match the following physical quantities with units.
| Physical quantity | Unit |
| A. Molarity | 1. mol kg-1 |
| B. Molality | 2. mol L-1 |
| C. Pressure | 3. Candela |
| D. Luminous intensity | 4. Pascal |
Codes
| A | B | C | D | |
| 1. | 1 | 4 | 2 | 3 |
| 2. | 2 | 1 | 4 | 3 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Introduction |
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Consider the two statements:
| Statement I: | Scientific notation for 0.00016 is \(1.6 \times 10^{-3} \). |
| Statement II: | The volume of water to be added to change the molarity of 200 mL 0.5 M aqueous solution to 0.1 M is 800 mL |
| 1. | Statement I is correct, Statement II is correct. |
| 2. | Statement I is incorrect, Statement II is correct. |
| 3. | Statement I is correct, Statement II is incorrect. |
| 4. | Statement I is incorrect, Statement II is incorrect. |
Subtopic: Introduction |
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Which, of the following, laws of chemical combination is followed by \(N_2O~, NO \) and \(N_2O_3\) ?
1. Law of conservation of mass
2. Law of multiple proportions
3. Law of constant proportions
4. Gay Lussac's law of constant volume
1. Law of conservation of mass
2. Law of multiple proportions
3. Law of constant proportions
4. Gay Lussac's law of constant volume
Subtopic: Introduction |
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How many chlorine atoms are in 1.00 mL of CCl4 (M=153.8, density=1.59 g mL-1)?
1. 1.56×1021
2. 6.23×1021
3. 1.57×1022
4. 2.49×1022
1. 1.56×1021
2. 6.23×1021
3. 1.57×1022
4. 2.49×1022
Subtopic: Moles, Atoms & Electrons |
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If Avogadro number , is changed from to 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%
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NEET - 2015
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The maximum number of atoms is present in which of the following -
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 |
78%
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NEET - 2020
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Which one of the following samples of gases contains the most particles?
All gases are at 0 °C and 1 atm pressure when 1 mole of gas has a volume of 22.4 L.
[Relative atomic mass, Ar : H = 1, He = 4, C = 12, O = 16, Cl = 35.5]
1. 33.6 L of chlorine gas
2. 66.0 g of carbon dioxide gas
3. 22.4 L of hydrogen gas
4. 10.0 g of helium gas
All gases are at 0 °C and 1 atm pressure when 1 mole of gas has a volume of 22.4 L.
[Relative atomic mass, Ar : H = 1, He = 4, C = 12, O = 16, Cl = 35.5]
1. 33.6 L of chlorine gas
2. 66.0 g of carbon dioxide gas
3. 22.4 L of hydrogen gas
4. 10.0 g of helium gas
Subtopic: Moles, Atoms & Electrons |
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