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Limiting reagent: amount of product when given amounts of two reactants are mixed

This type of question, asked 14 times: 2021 Paper 21, 26 Jun 2022, 29 Jun 2022, 28 Jul 2022, 29 Jul 2022, 31 Jan 2023, 6 Apr 2023, 1 Feb 2024, 23 Jan 2025, 24 Jan 2025, 2 Apr 2025, 7 Apr 2025, 22 Jan 2026 S2, 28 Jan 2026 S2. All 14 questions below, oldest first.

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  1. Question 1

    2021 Paper 21

    54
    100 g100\text{ }g of propane is completely reacted with 1000 g1000\text{ }g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x×10−2x \times10^{- 2}. The value of xx is . (Nearest integer) [Atomic weight: H=1.008;C=12.00;O=16.00H = 1.008;C = 12.00;O = 16.00 ]

  2. Question 2

    26 Jun 2022

    141
    CNGCNG is an important transportation fuel. When 100 g CNG is mixed with 208 g oxygen in vehicles, it leads to the formation of CO2CO_{2} and H2OH_{2}O and produces large quantity of heat during this combustion, then the amount of carbon dioxide, produced in grams is [nearest integer] [Assume CNG to be methane]

  3. Question 3

    29 Jun 2022

    31
    Production of iron in blast furnace follows the following equation
    Fe3O4( s)+4CO(g)→3Fe(l)+4CO2( g)Fe_{3}O_{4}(\text{ }s) + 4CO(g) \rightarrow 3Fe(l) + 4CO_{2}(\text{ }g)
    when 4.640 kg4.640\text{ }kg of Fe3O4Fe_{3}O_{4} and 2.520 kg2.520\text{ }kg of COCO are allowed to react then the amount of iron (in gg ) produced is: [Given: Molar Atomic mass (gmol−1):Fe=56\left( gmol^{- 1} \right):Fe = 56 Molar Atomic mass (gmol−1):O=16\left( gmol^{- 1} \right):O = 16 Molar Atomic mass (gmol−1):C=12\left( gmol^{- 1} \right):C = 12]

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  4. Question 4

    28 Jul 2022

    51
    In the given reaction,
    X+Y+3Z⇌XYZ3X + Y + 3Z \rightleftharpoons XYZ_{3}
    if one mole of each of XX and YY with 0.05 mol0.05\text{ }mol of ZZ gives compound XYZ3XYZ_{3}. (Given: Atomic masses of X,YX,Y and ZZ are 10,20 and 30amu30amu, respectively). The yield of XYZ3XYZ_{3} is _____ g. (Nearest integer)

  5. Question 5

    29 Jul 2022

    32
    N2( g)+3H2( g)⇌2NH3( g)N_{2(\text{ }g)}+ 3H_{2(\text{ }g)}\rightleftharpoons 2NH_{3(\text{ }g)} The reaction is started with 20 g20\text{ }g of N2N_{2} and 5 g5\text{ }g of H2H_{2}. For this mixture, the limiting reagent of the reaction and number of moles of NH3NH_{3} formed respectively are:

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  6. Question 6

    31 Jan 2023

    149
    Assume carbon burns according to following equation:
    2C(s)+O2( g)→2CO(g)2C_{(s)}+O_{2(\text{ }g)}\rightarrow 2CO(g)
    when  12 g\ 12\text{ }g carbon is burnt in 48 g48\text{ }g of oxygen, the volume of carbon monoxide produced is ×\times 10−1 L10^{- 1}\text{ }L at STP [ nearest integer ] [Given: Assume co as ideal gas, Mass of c is 12 g mol−112\text{ }g{\text{ }mol}^{- 1}, Mass of OO is 16 g mol−116\text{ }g{\text{ }mol}^{- 1} and molar volume of an ideal gas STP is 22.7 L mol−122.7\text{ }L{\text{ }mol}^{- 1} ]

  7. Question 7

    6 Apr 2023

    59
    If 5 moles of BaCl2BaCl_{2} is mixed with 2 moles of Na3PO4Na_{3}PO_{4}, the maximum number of moles of Ba3(PO4)2Ba_{3}\left( PO_{4} \right)_{2} formed is___ (Nearest integer)

  8. Question 8

    1 Feb 2024

    59
    Consider the following reaction:
    3PbCl2+2(NH4)3PO4→Pb3(PO4)2+6NH4Cl3PbCl_{2}+ 2\left( NH_{4} \right)_{3}PO_{4}\rightarrow Pb_{3}\left( PO_{4} \right)_{2}+ 6NH_{4}Cl
    If 72mmol72mmol of PbCl2PbCl_{2} is mixed with 50mmol50mmol of (NH4)3PO4\left( NH_{4} \right)_{3}PO_{4}, then amount of Pb3(PO4)2Pb_{3}\left( PO_{4} \right)_{2} formed is ...... mmol. (nearest integer)

  9. Question 9

    23 Jan 2025

    123
    When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is ____\_\_\_\_ . (Nearest integer) Given : Molar mass of Al is 27.0 g mol−127.0\text{ }g{\text{ }mol}^{- 1} Molar mass of O is 16.0 g mol−116.0\text{ }g{\text{ }mol}^{- 1}

  10. Question 10

    24 Jan 2025

    50
    Consider the following reaction occurring in the blast furnace.
    Fe3O4( s)+4CO(g)→3Fe(l)+4CO2( g)Fe_{3}O_{4(\text{ }s)}+ 4CO_{(g)}\rightarrow 3Fe_{(l)}+ 4CO_{2(\text{ }g)}
    'xx' kg of iron is produced when 2.32×103 kg2.32 \times10^{3}\text{ }kg Fe3O4Fe_{3}O_{4} and 2.8×102 kgCO2.8 \times10^{2}\text{ }kgCO are brought together in the furnace. The value of ' xx ' is ____\_\_\_\_ . (nearest integer) {Given : Molar mass of Fe3O4=232 g mol−1Fe_{3}O_{4}= 232\text{ }g{\text{ }mol}^{- 1} Molar mass of CO=28 g mol−1CO = 28\text{ }g{\text{ }mol}^{- 1} Molar mass of  Fe=56 g mol−1}\left. \ Fe = 56\text{ }g{\text{ }mol}^{- 1} \right\}

  11. Question 11

    2 Apr 2025

    33
    CaCO3( s)+2HCl(aq)→CaCl2(aq)+CO2( g)+H2O(l)CaCO_{3}(\text{ }s) + 2HCl(aq) \rightarrow CaCl_{2}(aq) +CO_{2}(\text{ }g)+H_{2}O(l) Consider the above reaction, what mass of CaCl2CaCl_{2} will be formed if 250 mL of 0.76 M HCl reacts with 1000 g of CaCO3CaCO_{3} ? (Given : Molar mass of Ca,C,O,HCa,C,O,H and Cl are 40, 12,16,112,16,1 and 35.5 g mol−135.5\text{ }g{\text{ }mol}^{- 1}, respectively)

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  12. Question 12

    7 Apr 2025

    123
    Butane reacts with oxygen to produce carbon dioxide and water following the equation given below
    C4H10( g)+132O2( g)→4CO2( g)+5H2O(l)C_{4}H_{10}(\text{ }g) + \frac{13}{2}O_{2}(\text{ }g) \rightarrow 4{CO}_{2}(\text{ }g) + 5H_{2}O(l)
    If 174.0 kg of butane is mixed with 320.0 kg of O2O_{2}, the volume of water formed in litres is .(Nearest integer) [Given : (a) Molar mass of C,H,OC,H,O are 12,1 , 16 g mol−116\text{ }g{\text{ }mol}^{- 1} respectively, (b) Density of water =1 g mL−1= 1\text{ }g{\text{ }mL}^{- 1} ]

  13. Question 13

    22 Jan 2026 S2

    28
    A+2 B⟶AB2A + 2\text{ }B \longrightarrow AB_{2} 36.0 g of 'A' (Molar mass : 60 g mol−160\text{ }g{\text{ }mol}^{- 1} ) and 56.0 g of ' B ' (Molar mass : 80 g mol−180\text{ }g{\text{ }mol}^{- 1}) are allowed to react. Which of the following statements are correct? (A) ' A ' is the limiting reagent (B) 77.0 g of AB2{AB}_{2} is formed (C) Molar mass of AB2{AB}_{2} is 140 g mol−1140\text{ }g{\text{ }mol}^{- 1} (D) 15.0 g of A is left unreacted after the completion of reaction. Choose the correct answer from the options given below :

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  14. Question 14

    28 Jan 2026 S2

    43
    For the given reaction;
    CaCO3+2HCl→CaCl2+H2O+CO2CaCO_{3}+ 2HCl \rightarrow CaCl_{2}+H_{2}O +CO_{2}
    If 90 gCaCO390\text{ }gCaCO_{3} is added to 300 mL of HCl which contains 38.55%HCl38.55\% HCl by mass and has density 1.13 g mL−11.13\text{ }g{\text{ }mL}^{- 1}, then which of the following option is correct? Given molar mass of H,Cl,CaH,Cl,Ca and O are 1, 35.5, 40 and 16 g mol−116\text{ }g{\text{ }mol}^{- 1} respectively.

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