- 1(current)
Q. No.20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g of magnesium oxide.
The percentage purity of magnesium carbonate in the sample is:
(Atomic weight of Mg=24)
| 1. | 75 | 2. | 96 |
| 3. | 60 | 4. | 84 |
Subtopic: Limiting Reagent |
68%
From NCERT
NEET - 2015
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In a reaction A + B2 → AB2,
A will act as a limiting reagent if :
| i. | 300 atoms of A reacts with 200 molecules of B |
| ii. | 2 moles A reacts with 3 moles B2 |
| iii. | 100 atoms of A reacts with 100 molecules of B |
| iv. | 5 moles A reacts with 2.5 moles B |
| v. | 2.5 moles A reacts with 5 moles B2 |
Choose the correct option:
| 1. | (i), (ii) | 2. | (i), (ii), (v) |
| 3. | (ii), (v) | 4. | All |
Subtopic: Limiting Reagent |
71%
From NCERT
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To produce 20 moles of ammonia via Haber's process, how many moles of hydrogen molecules are required?
| 1. | 40 mol | 2. | 10 mol |
| 3. | 20 mol | 4. | 30 mol |
Subtopic: Limiting Reagent | Equation Based Problem |
81%
From NCERT
NEET - 2019
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Which of the following statements about the reaction given below is correct?
| 1. | Total mass of iron and oxygen in reactants = total mass of iron and oxygen in product therefore it follows the law of conservation of mass |
| 2. | Total mass of reactants = total mass of product, therefore, the law of multiple proportions is followed |
| 3. | The amount of Fe2O3 can be increased by taking any one of the reactants (iron or oxygen) in excess. |
| 4. | The amount of Fe2O3 produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess. |
Subtopic: Limiting Reagent |
74%
From NCERT
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- 1(current)
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