1.

    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

    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 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

    3.

    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

    4.

    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

    5.

    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

    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, types of chemical reactions, reactivity series

    7.

    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

    8.

    A student places a piece of metal X into a solution of ZnSO4ZnSO_4. No reaction is observed. The student then places a piece of metal X into a solution of CuSO4CuSO_4. A reaction occurs, and a reddish-brown solid forms. Where would metal X most likely be placed in the reactivity series?

    A

    Above Zn

    B

    Below Cu

    C

    Between Zn and Cu

    D

    Above both Zn and Cu

    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 :3 mins
    πŸ”„Ncert Concepts :Chemical Reactions, Metal Displacement, Reactivity Series, Deductive Reasoning

    9.

    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

    10.

    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

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