1.

    Which of the following experiments definitively proved the Law of Conservation of Mass?

    A

    Dalton's atomic theory

    B

    Gay-Lussac's law of combining volumes

    C

    Lavoisier's experiments on heating mercury in a sealed container

    D

    Proust's law of definite proportions

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

    Related Questions

    1.

    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

    2.

    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

    3.

    Which metal, among Mg, Cu, Ag, and Au, would effectively displace copper from a copper sulfate solution?

    A

    Mg

    B

    Cu

    C

    Ag

    D

    Au

    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

    4.

    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

    5.

    A sample of hydrated copper sulfate weighs 25g. After heating to remove the water of crystallization, the anhydrous copper sulfate weighs 16g. What is the percentage of water of crystallization in the original sample?

    A

    16%

    B

    25%

    C

    36%

    D

    56%

    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 :Law of Conservation of Mass, Percentage Composition, Water of Crystallization

    6.

    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

    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.

    If two elements A and B combine in different ratios to form two compounds, the masses of B that combine with a fixed mass of A are in a small whole number ratio. This is a statement of:

    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:Understanding
    🎯Difficulty :Hard
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Laws of Chemical Combination, Law of Multiple Proportions

    9.

    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

    10.

    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

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