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Q: According to the law of constant proportions -
  • A. Atoms of different elements in chemical matter have different mass and chemical properties
  • B. Atoms combine in the ratio of small whole numbers to form compounds in chemical matter.
  • C. In chemical matter, elements are always present in a fixed proportion of mass.
  • D. Atoms in chemical matter are indivisible particles that cannot be formed or destroyed in a chemical reaction.
Correct Answer: Option C - The law of definite proportions was formulated by Joseph Proust. According to this law, the weights or masses of the constituent elements in a chemical compound always have a fixed ratio. For example, the ratio of the weights of hydrogen and oxygen in H2O is 1:8. The ratio of the weight of hydrogen and oxygen in water obtained from any source is always 1:8.
C. The law of definite proportions was formulated by Joseph Proust. According to this law, the weights or masses of the constituent elements in a chemical compound always have a fixed ratio. For example, the ratio of the weights of hydrogen and oxygen in H2O is 1:8. The ratio of the weight of hydrogen and oxygen in water obtained from any source is always 1:8.

Explanations:

The law of definite proportions was formulated by Joseph Proust. According to this law, the weights or masses of the constituent elements in a chemical compound always have a fixed ratio. For example, the ratio of the weights of hydrogen and oxygen in H2O is 1:8. The ratio of the weight of hydrogen and oxygen in water obtained from any source is always 1:8.