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PASSAGE-I : Earlier the concept of equiv...

PASSAGE-I : Earlier the concept of equivalent weights was very common and the concentrations of the solutions were expressed in terms of normalities. The convenience was that the substances react in the ratio of their gram equivalents. So, there was no need to write balanced equation to determine the amounts of the substances reacted. However, determination of equivalent weights posed difficulty in certain cases. Moreover, the equivalent weight of the same substance is not same in different reactions. For example, `KMnO_(4)` has different equivalent weight in the basic medium than in the acidic medium. Hence, now-a-days, mole concept is more common and the concentrations of the solutions are generally expressed in terms of molarities, though some other methods like molality, mole fraction etc. are also used.
The equivalent weight of Cu

A

will be same in CuO and `Cu_(2)O`

B

will be double in `Cu_(2)O` than in CuO

C

will be double in CuO than in `Cu_(2)O`

D

depends upon whether copper is pure or impure

Text Solution

Verified by Experts

The correct Answer is:
B
In CuO, 8 parts by mass of oxygen combine with `(63.5)/(2)` parts by mass of copper
implies Eq. wt. = 31.75
In `Cu_(2)O`, 8 parts by mass of oxygen combine with 63.5 parts by mass of copper
implies Eq. wt. = 63.5
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Earlier the concept of equivalent weights was very common and the concentrations of the solutions were expressed in terms of normalities. The convenience was that the substances reacted in the ratio of their gram equivalents . So there was no need to write balanced equation to determine the amounts of the substraces reacted. However, determination or equivalent weights posed difficulty in certain cases. Moreover, the equivalent weight of the same substance is not same in different reactions, For example, KMnO_(4) has different equivalent weight in the basic medium than inthe acidic medium. Hence, now a days, mole concept is more common and the concentrations of the solutions are generally expressed in terms of molarities, though some other methods like molality. mole fraction etc. are also used. The chloride of an element is found to contain 52.8% chlorine. The equivalent weight of the element is

Earlier the concept of equivalent weight was very common and the concentrations of the solutions were expressed in terms of normolities. The convenience was that the substances reacted in the ratio of their gram equivalents. So there was no need for writing the balanced equations to determine the amounts of the substances reacted. However, determination of equivalent weights posed difficulty in certain cases. Moreover, the equivalent weight of the same substance is not same in different reactions. For example, KMnO_(4) has different equivalent weight in the basic medium than in teh acidic medium. Hence, now-a-days, mole concept is more common and the concentrations of the solutions are generally expressed in terms of molarities, though some other methods like molality, molarity, mole fractions etc. are also used The chloride of an element is found to contain 52.8% chlorine. The equivalent mass of the element is

Knowledge Check

  • PASSAGE-I : Earlier the concept of equivalent weights was very common and the concentrations of the solutions were expressed in terms of normalities. The convenience was that the substances react in the ratio of their gram equivalents. So, there was no need to write balanced equation to determine the amounts of the substances reacted. However, determination of equivalent weights posed difficulty in certain cases. Moreover, the equivalent weight of the same substance is not same in different reactions. For example, KMnO_(4) has different equivalent weight in the basic medium than in the acidic medium. Hence, now-a-days, mole concept is more common and the concentrations of the solutions are generally expressed in terms of molarities, though some other methods like molality, mole fraction etc. are also used. The chloride of an element is found to contain 52.8% chlorine. The equivalent weight of the element is

    A
    63.4
    B
    31.7
    C
    47.2
    D
    18.7

  • PASSAGE-I : Earlier the concept of equivalent weights was very common and the concentrations of the solutions were expressed in terms of normalities. The convenience was that the substances react in the ratio of their gram equivalents. So, there was no need to write balanced equation to determine the amounts of the substances reacted. However, determination of equivalent weights posed difficulty in certain cases. Moreover, the equivalent weight of the same substance is not same in different reactions. For example, KMnO_(4) has different equivalent weight in the basic medium than in the acidic medium. Hence, now-a-days, mole concept is more common and the concentrations of the solutions are generally expressed in terms of molarities, though some other methods like molality, mole fraction etc. are also used. A 40% w/w hydrochloric acid is found to have a density of 1.20 g mL^(-1) . The molality of the above solution will be nearly.

    A
    15.3 m
    B
    16.3 m
    C
    17.3 m
    D
    18.3 m

  • Earlier the concept of equivalent weight was very common and the concentrations of the solutions were expressed in terms of normolities. The convenience was that the substances reacted in the ratio of their gram equivalents. So there was no need for writing the balanced equations to determine the amounts of the substances reacted. However, determination of equivalent weights posed difficulty in certain cases. Moreover, the equivalent weight of the same substance is not same in different reactions. For example, KMnO_(4) has different equivalent weight in the basic medium than in teh acidic medium. Hence, now-a-days, mole concept is more common and the concentrations of the solutions are generally expressed in terms of molarities, though some other methods like molality, molarity, mole fractions etc. are also used The equivalent mass of Cu

    A
    will be the same in CuO and `Cu_(2)O`
    B
    will be double in `Cu_(2)O` than in `CuO`
    C
    will be double in `CuO` than in `Cu_(2)O`
    D
    depends on whether copper is pure or impure

    • Similar Questions

    Explore conceptually related problems

    Earlier the concept of equivalent weight was very common and the concentrations of the solutions were expressed in terms of normolities. The convenience was that the substances reacted in the ratio of their gram equivalents. So there was no need for writing the balanced equations to determine the amounts of the substances reacted. However, determination of equivalent weights posed difficulty in certain cases. Moreover, the equivalent weight of the same substance is not same in different reactions. For example, KMnO_(4) has different equivalent weight in the basic medium than in teh acidic medium. Hence, now-a-days, mole concept is more common and the concentrations of the solutions are generally expressed in terms of molarities, though some other methods like molality, molarity, mole fractions etc. are also used The molality of the above solution will be nearly

    Earlier the concept of equivalent weight was very common and the concentrations of the solutions were expressed in terms of normolities. The convenience was that the substances reacted in the ratio of their gram equivalents. So there was no need for writing the balanced equations to determine the amounts of the substances reacted. However, determination of equivalent weights posed difficulty in certain cases. Moreover, the equivalent weight of the same substance is not same in different reactions. For example, KMnO_(4) has different equivalent weight in the basic medium than in teh acidic medium. Hence, now-a-days, mole concept is more common and the concentrations of the solutions are generally expressed in terms of molarities, though some other methods like molality, molarity, mole fractions etc. are also used The mole fraction of hydrochloric acid in the solution will be

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