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Q. No.The prefix peta used in the SI system is:
1.
\(10^{15}\)
2.
\(10^{-15} \)
3.
\(10^{18}\)
4.
\(10^{-18} \)
Subtopic: Introduction |
From NCERT
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In the following reaction:
\(4HCl + MnO_2 \rightarrow 2H_2O + MnCl_2 + Cl_2\)
Amount(in g) of manganese dioxide that reacts with 7.3 g of HCl is: (Atomic weight of Mn is 55)
1. 0.23
2. 5.85
3. 4.35
4. 5.18
\(4HCl + MnO_2 \rightarrow 2H_2O + MnCl_2 + Cl_2\)
Amount(in g) of manganese dioxide that reacts with 7.3 g of HCl is: (Atomic weight of Mn is 55)
1. 0.23
2. 5.85
3. 4.35
4. 5.18
Subtopic: Equation Based Problem |
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The statement, "If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in the ratio of small whole numbers," was given by:
1. Gay Lussac
2. Dalton
3. Antoine Lavoisier
4. Joseph Proust
1. Gay Lussac
2. Dalton
3. Antoine Lavoisier
4. Joseph Proust
Subtopic: Introduction |
From NCERT
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If 50 ml of water is added to 100 ml of 1 M NaCl (aq) solution, then the final molarity of the solution will be:
| 1. | 0.5 M | 2. | 0.25 M |
| 3. | 0.67 M | 4. | 1.5 M |
Subtopic: Concentration Based Problem |
71%
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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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NEET - 2022
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What is the total volume of gases present after the completion of the reaction between 150 cm3 of F2 and 100 cm3 of Cl2?
3F2 (g) + Cl 2(g) → 2ClF3 (g)
(assuming the reaction occurs at constant temperature and pressure)
1. 250 cm3
2. 150 cm3
3. 350 cm3
4. 200 cm3
3F2 (g) + Cl 2(g) → 2ClF3 (g)
(assuming the reaction occurs at constant temperature and pressure)
1. 250 cm3
2. 150 cm3
3. 350 cm3
4. 200 cm3
Subtopic: Limiting Reagent | Introduction |
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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 |
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The number of moles of methane required for the combustion process to yield 81 grams of water is:
1. 2.25 mole
2. 4.5 mole
3. 9 mole
4. 1.125 mole
1. 2.25 mole
2. 4.5 mole
3. 9 mole
4. 1.125 mole
Subtopic: Equation Based Problem |
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JEE
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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 |
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JEE
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| Assertion (A): |
The mass of 233 g of BaSO₄ corresponds to one mole of BaSO₄. |
| Reason (R): | One mole of BaSO4 is obtained when one mole of BaCl2 is treated with 1 litre of 1M H2SO4. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Introduction |
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