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Statement-I : Pure water obtained from d...

Statement-I : 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.
Because
Statement-II : `A` chemical compound always contains elements combined together in same proportion by mass. it wa discovered by French chemist, Joseph Proust `(1799)`.

A

Statement-I is true, Statement-II is true , Statement-II is correct explanation for Statement-I

B

Statement-I is true, Statement-II is true , Statement-II is `NOT` a correct explanation for statement-I

C

Statement-I is true, Statement-II is false

D

Statement-I is false, Statement-II is true

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both statements (Statement-I and Statement-II) and determine their correctness. ### Step 1: Analyze Statement-I **Statement-I:** 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. - Water is a chemical compound with the formula H₂O. - The molar mass of hydrogen (H) is approximately 1 g/mol, and the molar mass of oxygen (O) is approximately 16 g/mol. - In one molecule of water (H₂O), there are 2 hydrogen atoms and 1 oxygen atom. - Therefore, the mass of hydrogen in water = 2 × 1 g/mol = 2 g. - The mass of oxygen in water = 16 g/mol. - The mass ratio of hydrogen to oxygen in water is 2 g (H) : 16 g (O) = 1:8. Thus, Statement-I is **correct**. ### Step 2: Analyze Statement-II **Statement-II:** A chemical compound always contains elements combined together in the same proportion by mass. This was discovered by French chemist Joseph Proust (1799). - This statement refers to the Law of Definite Proportions, which states that a chemical compound always contains its constituent elements in fixed proportions by mass, regardless of the source or how it was prepared. - Joseph Proust indeed formulated this law in 1799, confirming that compounds like water (H₂O) will always have the same mass ratio of hydrogen to oxygen. Thus, Statement-II is also **correct**. ### Step 3: Conclusion Since both Statement-I and Statement-II are correct, and Statement-II provides a valid explanation for Statement-I, we conclude that both statements are true. ### Final Answer: Both Statement-I and Statement-II are correct, and Statement-II explains Statement-I. ---
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