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Question

The law of constant proportions was established on the basis of analysis of:

This question was previously asked in
HTET 2025 Level 1 PRT Question Paper (5-Jul-2026)
The correct answer is

Pure chemical compounds

The law of constant proportions, proposed by Joseph Proust, was established by analysing the elemental composition of pure chemical compounds. Proust found that a given pure compound always contains its constituent elements in a fixed proportion by mass, regardless of its source.

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