1.

    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

    Related Questions

    1.

    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

    2.

    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

    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.

    When a solid vaporizes directly without melting, it is known as:

    A

    Evaporation

    B

    Sublimation

    C

    Sedimentation

    D

    Saponification

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:Some Basic Concepts in Chemistry
    🎯Topic:Laws Of Chemical Combinations
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :States of Matter, Phase Transitions

    5.

    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

    6.

    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

    7.

    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

    8.

    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

    9.

    A sample of hydrated copper sulfate (CuSO4β‹…xH2OCuSO_4 \cdot xH_2O) weighs 25 g. Upon heating to drive off all the water, the anhydrous copper sulfate (CuSO4CuSO_4) remaining weighs 16 g. What is the value of 'x' (the number of water molecules of crystallization)?

    A

    2

    B

    3

    C

    5

    D

    7

    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, Hydrates

    10.

    Hydrogen and oxygen combine to form water (H2O). If 4g of hydrogen reacts completely with oxygen to form water, what mass of oxygen is required?

    A

    8g

    B

    16g

    C

    32g

    D

    64g

    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, Law of Definite Proportions

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