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If 100 grams of pure water taken from di...

If 100 grams of pure water taken from different sources is decomposed by passing electricity, 11 grams of hydrogen and `89` grams of oxygen are always obtained' . Which chemical law is illustrated by this statement ?

Text Solution

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The correct Answer is:
Law of constant proportions
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If 100 grams of calcium carbonate (whether in the form of marble or chalk) are decomposed completely, then 56 grams of calcium oxide and 44 grams of carbon dioxide are obtained'. Which law of chemical combination is illustrated by this statement ?

Four samples of water [H_(2)O] are collected from different sources, Each sample on analysis was found to containsame percentage of oxygen. Which law of chemical combination is demonstrated by the above observation?

Knowledge Check

  • PA SSAGE-III: According to Dalton's atomic theory, all matter whether an element, a compound or a mixture is composed of small particles called atoms which can neither be created nor destroyed during a chemical reaction. Dalton's theory provides a simple explanation for the laws of chemical combination. He used his theory to explain law of conservation of masses, law of constant proportions and law of multiple proportions, based on various postulates of the theory. Dalton was the first scientist to use the symbols for the elements in a very specific sense. When he used a symbol for an element he also meant a definite quantity of that element, that is one atom of that element. "If 100 g of calcium carbonate (whether in the form of marble or chalk) are decomposed, 56 g of calcium oxide and 44 g of carbon dioxide are formed." Which law of chemical combination is illustrated by this statement?

    A
    Law of constant proportions
    B
    Law of conservation of mass
    C
    Law of multiple proportions
    D
    Law of conservation of energy

  • Assertion: Pure water obtained from different sources always contains hydrogen and oxygen in the ratio of 1 : 8 by mass. Reason: Molecular mass of water is 18.

    A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
    B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
    C
    Assertion is correct statements but reason is wrong statement.
    D
    Assertion is wrong statement but reason is correct statement.

  • Assertion: Pure water obtained from different sources such as river, well, spring, sea etc. always contains hydrogen and oxygen combined in the ratio of 1 : 8 by mass. Reason: A chemical compound always contains same elements combined in same fixed proportion by mass.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

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    Ravi was performing some experiements related to the laws of chemical combination in the science laboratory under the guidance of his chemistry teacher Mr. John. Ravi found that when he burned 1 gram of hydrogen gas in 8 grams of oxygen gas in a closed vessel, he obtained 9 grams of water. He repeated this experiment many times but obtained the same results every time (a) Write a balanced chemical equation for the reaction between hydrogen and oxygen to form water. Also write the names of all the substances involved below their formulae in the equation (b) What are the reactants and products in the above reaction ? (c) Which law of chemical combination is illustrated by the fact that when Ravi burned 1g of hydrogen in 8g of oxygen, he obtained 9g of water ? (d) What mass of water will be obtained if 1g of hydrogen is burned in 10g of oxygen ? Which law of chemical combination will govern your answer ? (e) What values are displayed by Ravi in this episode ?

    Assertion : Pure water obtained from different sources such as river, well, spring, sea etc. always contains hydrogen and oxygen combined in the ratio 1:8 by mass. Reason : A chemical compound always contains elements combined together in same proportion by mass, it was discovered by French chemist, Joseph Proust (1799).

    Assertion (A): pure water obtained from different states of india always contains hydrogen and oxygen in the ration of 1:8 by mass. Reason (R ): Total mass of reactants and products during chemical change is always the same.

    Assertion. Pure water obtained from different sources such as sriver, well, spring, sea etc. always contains hydrogen and oxygen in the ratio of 1:8 by mass. Reason. Total mass of reactants and products during chemical or physical change is always the same.

    In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions Assertion (A) - Pure water obtained from different sources, such as river, well, spring, sea etc. always contains hydrogen and oxygen in ratio of 1:8 by mass Reason (R) - Mass of reactants and products during chemical or physical changes is always constant

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