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Q. No.The number of molecules and moles in 2.8375 litres of \(O_2\) in STP is-
1.
\(1.505 \times 10^{23} \) and 0.250
2.
\(7.625 \times 10^{23} \) and 0.250
3.
\(7.625 \times 10^{22} \) and 0.126
4.
\(7.527 \times 10^{22} \) and 0.125
Subtopic: Moles, Atoms & Electrons |
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A 1 M solution of a compound 'X' has a density of 1.25 g/mL. If the molar mass of compound X is 85 g, what is the molality (m) of the solution?
| 1. | 0.705 m | 2. | 1.208 m |
| 3. | 1.165 m | 4. | 0.858 m |
Subtopic: Concentration Based Problem |
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NEET - 2023
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Select the correct statements from the following:
Choose the correct answer from the option given below:
| A: | Atoms of all elements are composed of two fundamental particles. |
| B: | The mass of the electron is \(9.10939 \times 10^{-31} \mathrm{~kg} \text {. }\). |
| C: | All the isotopes of a given element show same chemical properties. |
| D: | Protons and electrons are collectively known as nucleons. |
| E: | Dalton's atomic theory regarded the atom as an ultimate particle of matter. |
| 1. | B, C and E only | 2. | A, B and C only |
| 3. | C, D and E only | 4. | A and E only |
Subtopic: Introduction |
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NEET - 2023
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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 |
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From NCERT
NEET - 2023
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In an experiment, it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO3. Which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine)?
1. X2Cl2
2. XCl2
3. XCl4
4. X2Cl
1. X2Cl2
2. XCl2
3. XCl4
4. X2Cl
Subtopic: Equation Based Problem |
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From NCERT
NEET - 2013
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The mass of a 2.5 mL solution (the density of the solution is 2.15 g/mL) in the correct significant figures is:
| 1. | 5375 × 10–3 g | 2. | 5.4 g |
| 3. | 5.38 g | 4. | 53.75 g |
Subtopic: Introduction |
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From NCERT
NEET - 2022
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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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The number of moles of water present in a spherical water droplet of radius 1.0 cm are:
[Given: Density of water in the droplet = 1.0 g cm–3]
1. \( \dfrac{\pi}{18} \)
2. \( \dfrac{2\pi}{27} \)
3. \(24\pi\)
4. \( \dfrac{2\pi}{9} \)
[Given: Density of water in the droplet = 1.0 g cm–3]
1. \( \dfrac{\pi}{18} \)
2. \( \dfrac{2\pi}{27} \)
3. \(24\pi\)
4. \( \dfrac{2\pi}{9} \)
Subtopic: Introduction |
66%
From NCERT
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If 0.02 moles of H2SO4 are present in 1 litre of solution from which 50% solution is taken out and again diluted up to 1 litre by adding water. Further, if 0.01 moles of H2SO4 are added, then the total millimoles of H2SO4 in the resulting solution will be:
1. 10
2. 5
3. 20
4. 15
1. 10
2. 5
3. 20
4. 15
Subtopic: Concentration Based Problem |
55%
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JEE
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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?
| 1. | 2 : 1 | 2. | 6 : 4 |
| 3. | 1 : 2 | 4. | 4 : 6 |
Subtopic: Moles, Atoms & Electrons |
59%
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