1.

    10g of hydrogen reacts with 80g of oxygen to form water. Which law of chemical combination does this demonstrate?

    A

    Law of Conservation of Mass

    B

    Law of Multiple Proportions

    C

    Law of Definite Proportions

    D

    Avogadro's Law

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Law of Definite Proportions

    Related Questions

    1.

    Which of the following reactions is not correct according to law of conservation of mass

    A

    2  Mg  +O2o  2  MgO2\,\,Mg\,\, + {O_2} o \,\,2\,\,MgO

    B

    C3H8 +O2 o CO2 + H2O{C_3}{H_8}\, + {O_2}\, o \,C{O_2}\, + \,{H_2}O

    C

    P4  +  5  O2  o  P4  O10{P_4}\,\, + \,\,5\,\,{O_2}\,\, o \,\,{P_{4\,\,}}{O_{10}}

    D

    CH4  +  2  O2  o  CO2  +  2  H2OC{H_4}\,\, + \,\,2\,\,{O_2}\,\, o \,\,C{O_2}\,\, + \,\,2\,\,{H_2}O

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Law of Conservation of Mass, Balancing Chemical Equations

    2.

    Which of the following reactions is the metal displacement reaction? Choose the right option.

    A

    Fe+2HCloFeCl2+H2↑Fe + 2HCl o FeC{l_2} + {H_2} \uparrow

    B

    2Pb(NO3)2o2PbO+4NO2+O2↑2Pb{(N{O_3})_2} o 2PbO + 4N{O_2} + {O_2} \uparrow

    C

    2KClO3β†’Ξ”2KCl+3O22KCl{O_3}\xrightarrow{\Delta }2KCl + 3{O_2}

    D

    Cr2O3+2Al→ΔAl2O3+2CrC{r_2}{O_3} + 2Al\xrightarrow{\Delta }A{l_2}{O_3} + 2Cr

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :metal displacement reaction, redox reaction, reactivity series

    3.

    10g of hydrogen reacts with 80g of oxygen to form water. Which law of chemical combination does this demonstrate?

    A

    Law of Conservation of Mass

    B

    Law of Multiple Proportions

    C

    Law of Definite Proportions

    D

    Avogadro's Law

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Law of Definite Proportions

    4.

    Which law explains the observation that 1g of hydrogen always combines with 8g of oxygen to form 9g of water?

    A

    Law of Conservation of Mass

    B

    Law of Multiple Proportions

    C

    Law of Definite Proportions

    D

    Gay-Lussac's Law

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Law of Definite Proportions

    5.

    Which law implies that the mass ratio of elements in a compound is always a whole number ratio?

    A

    Law of Multiple Proportions

    B

    Law of Conservation of Mass

    C

    Law of Definite Proportions

    D

    Avogadro's Law

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Laws of Chemical Combination, Law of Definite Proportions

    6.

    If two elements A and B combine to form two compounds AB and AB2, and 1g of A combines with 0.5g of B in AB, how much of B will combine with 1g of A in AB2 according to the Law of Multiple Proportions?

    A

    0.25g

    B

    0.5g

    C

    1g

    D

    2g

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Laws of Chemical Combination, Law of Multiple Proportions

    7.

    Which of the following is not a disproportion atom reaction

    A

    Cl2+OHβˆ’oClβˆ’+ClOβˆ’3+H2OC{l_2} + O{H^ - } o C{l^ - } + Cl{O^ - }_3 + {H_2}O

    B

    P4+OHβˆ’+H2OoPH3+H2POβˆ’2{P_4} + O{H^ - } + {H_2}O o P{H_3} + {H_2}P{O^ - }_2

    C

    S8+OHβˆ’o4S2βˆ’+2 S2O32βˆ’+6H2O{S_8} + O{H^ - } o 4{S^2}^ - + 2\,{S_2}{O_3}^{2 - } + 6{H_2}O

    D

    F2+OHβˆ’oFβˆ’+OF2+H2O{F_2} + O{H^ - } o {F^ - } + O{F_2} + {H_2}O

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Disproportionation reaction, oxidation states, redox reactions

    8.

    Which of the following reactions represents a metal displacement reaction?

    A

    Fe(s)+CuSO4(aq)β†’FeSO4(aq)+Cu(s)Fe(s) + CuSO4(aq) β†’ FeSO4(aq) + Cu(s)

    B

    NaCl(aq)+AgNO3(aq)β†’AgCl(s)+NaNO3(aq)NaCl(aq) + AgNO3(aq) β†’ AgCl(s) + NaNO3(aq)

    C

    CaCO3(s)β†’CaO(s)+CO2(g)CaCO3(s) β†’ CaO(s) + CO2(g)

    D

    2H2(g)+O2(g)β†’2H2O(l)2H2(g) + O2(g) β†’ 2H2O(l)

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    PYQ YEAR: 2021
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Chemical Reactions, Metal Displacement

    9.

    10 g of a metal oxide on strong heating gave 6.4 g of metal. If the formula of the metal oxide is M2O3M_2O_3, what is the atomic mass of the metal M?

    A

    56

    B

    43

    C

    27

    D

    65

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Laws of Chemical Combination, Stoichiometry, Law of Definite Proportions

    10.

    Two elements, X and Y, combine to form two compounds. Compound A contains 27.3% X and 72.7% Y by mass. Compound B contains 42.9% X and 57.1% Y by mass. If the mass of Y is fixed at 100g in both compounds, which of the following represents the masses of X in the two compounds, consistent with the Law of Multiple Proportions?

    A

    37.5g and 75g

    B

    27.3g and 42.9g

    C

    137.5g and 175g

    D

    72.7g and 57.1g

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Law of Multiple Proportions

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