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Q. No.

Which of the following statements about the reaction given below is correct?

4Fe(s)+3O2(g)→2Fe2O3(g)

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 |
 77%
Level 2: 60%+
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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
Subtopic:  Limiting Reagent | Introduction |
 54%
Level 3: 35%-60%
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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%
Level 1: 80%+
NEET - 2019
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4NH3 + 5O2 → 6H2O + 4NO

When 1 mole of ammonia (NH₃) reacts with 1 mole of oxygen (O₂), which of the following outcomes occurs regarding the consumption of the reactants?

1. Oxygen is completely consumed.
2. Ammonia is completely consumed.
3. Both oxygen (O₂) and ammonia (NH₃) are completely consumed
4. Neither oxygen (O₂) nor ammonia (NH₃) is completely consumed.
Subtopic:  Limiting Reagent |
 69%
Level 2: 60%+
AIPMT - 1998
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The amount of Zinc (atomic weight = 65) necessary to produce 224 mL of H2 (at STP) by the reaction with dilute sulphuric acid will be: 

1. 0.65 g 2. 7.6 g
3. 6.5 g 4. 8.5 g
Subtopic:  Limiting Reagent |
 80%
Level 1: 80%+
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Find the final volume of gases when 20 mL of nitric oxide (NO) reacts with 10 mL of oxygen (O₂) at
 STP to form nitrogen dioxide (NO₂).

1. 30 ml
2. 20 ml
3. 10 ml
4. 40 ml
Subtopic:  Limiting Reagent |
 62%
Level 2: 60%+
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What is the limiting reagent when 97.5 grams of zinc sulphide undergo the reaction with 32 grams of oxygen gas?

2ZnS + 3O₂ → 2ZnO + 2SO₂ 
(Given: Molar mass of ZnS = 97.5 g mol⁻¹)
1. ZnS
2. O2
3. ZnO
4. SO2

Subtopic:  Limiting Reagent |
 77%
Level 2: 60%+
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What is the maximum mass of CCl₄ formed when 10 g of carbon reacts completely with 100 g of chlorine gas (Cl₂)?

1. 128 gm 
2. 94.22 gm 
3. 108.45 gm 
4. 54.22 gm 
Subtopic:  Limiting Reagent |
 59%
Level 3: 35%-60%
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The elements A (atomic weight = 75) and B (atomic weight = 32) combine to form a compound X. If 3 moles of B combine with 2 moles of A to produce 1 mole of X, the weight of 5 moles of X will be:
1. 246 gm 2. 1230 amu
3. 1.23 kg 4. None of the above
Subtopic:  Limiting Reagent |
 50%
Level 3: 35%-60%
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For the reaction, \(2A+B\xrightarrow{~~~~~~~~}3C,8\) moles of \(A\) reacts with \(5\) moles of \(B\) to form \(C.\)
Calculate the maximum number of moles that are formed.
1. \(13\) moles 2. \(15\) moles
3. \(12\) moles 4. \(8\) moles
Subtopic:  Limiting Reagent |
 78%
Level 2: 60%+
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