1.

    Two different samples of copper(II) oxide were analyzed and found to contain the same percentage of copper by mass. Which law does this illustrate?

    A

    Law of Multiple Proportions

    B

    Law of Conservation of Mass

    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 :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Laws of Chemical Combination, Law of Definite Proportions

    Related Questions

    1.

    Which law explains why 18g of water always decomposes into 2g of hydrogen and 16g of oxygen?

    A

    Law of Conservation of Mass

    B

    Law of Definite Proportions

    C

    Law of Multiple 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:Application
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Laws of Chemical Combination, Law of Conservation of Mass

    2.

    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

    3.

    Which of the following postulates of Dalton's atomic theory explains the Law of Conservation of Mass?

    A

    Atoms of different elements have different masses.

    B

    Atoms are indivisible particles.

    C

    Atoms combine in simple whole number ratios to form compounds.

    D

    Atoms are neither created nor destroyed during a chemical reaction.

    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 :Dalton's Atomic Theory, Law of Conservation of Mass

    4.

    A mixture of COCO and CO2CO_2 weighing 1.12 g is treated with an excess of red hot CuOCuO. The COCO is converted to CO2CO_2. The total weight of CO2CO_2 produced is 1.6 g. What was the weight percentage of COCO in the original mixture?

    A

    42.86%

    B

    57.14%

    C

    28.57%

    D

    71.43%

    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 :3 mins
    πŸ”„Ncert Concepts :Laws of Chemical Combination, Stoichiometry, Law of Conservation of Mass

    5.

    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, types of chemical reactions, reactivity series

    6.

    If two elements A and B combine in different ratios to form two compounds, AxByA_xB_y and ApBqA_pB_q, then according to the Law of Multiple Proportions:

    A

    The ratio of masses of B which combine with a fixed mass of A is a simple whole number ratio.

    B

    The ratio of masses of A which combine with a fixed mass of B is a simple whole number ratio.

    C

    The ratio of masses of A which combine with a fixed mass of A is a simple whole number ratio.

    D

    The ratio of masses of B which combine with a fixed mass of B is a simple whole number ratio.

    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 Multiple Proportions

    7.

    Iron filings are added to a solution of copper sulfate. Which observation indicates a metal displacement reaction has occurred?

    A

    Gas bubbles are produced.

    B

    The temperature of the solution decreases.

    C

    The blue solution fades and a reddish-brown solid deposits.

    D

    The solution becomes more intensely blue.

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

    8.

    In which of the following reactions does zinc metal undergo displacement?

    A

    ZnO(s)+H2SO4(aq)β†’ZnSO4(aq)+H2O(l)ZnO(s) + H2SO4(aq) β†’ ZnSO4(aq) + H2O(l)

    B

    Zn(s)+CuSO4(aq)β†’ZnSO4(aq)+Cu(s)Zn(s) + CuSO4(aq) β†’ ZnSO4(aq) + Cu(s)

    C

    2Zn(s)+O2(g)β†’2ZnO(s)2Zn(s) + O2(g) β†’ 2ZnO(s)

    D

    ZnCO3(s)β†’ZnO(s)+CO2(g)ZnCO3(s) β†’ ZnO(s) + CO2(g)

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

    9.

    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

    10.

    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

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