Chemistry
Grade-8
Easy

Question

The true statement among the following is

  1. In a pure water, the ratio of mass of hydrogen to oxygen is 1 : 8 but it changes to 1 : 9 when the water is sea water.
  2. The atomic mass of magnesium is 28 grams.
  3. If an ice cube weighing 50 grams melts, then it should produce also produce at least 60 grams of water.
  4. According to law of constant proportion, it does not matter how the compound is formed.

hintHint:

The ratio of any substance remains the same no matter what.

The correct answer is: According to law of constant proportion, it does not matter how the compound is formed.



    The law of constant proportions states that a compound is composed of a constant mass proportion of elements. This means that regardless of the source, a pure sample of a compound will always consist of the same elements present in the same mass ratios. For example, pure water always contains hydrogen and oxygen in a fixed mass ratio (1 gram of water is approximately 0.11 grams of hydrogen and 0.88 grams of oxygen, a ratio of 1:8).

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