Question

John Dalton proposed which theory?
A) Theory of molecules.
B) Atomic mass theory.
C) Theory of atoms.
D) Law of conservation of substances.

Answer 1

We know Dalton put together his hypothesis with respect to two laws: the law of protection of mass and the law of consistent peace. The law of preservation of mass says that matter isn't made or obliterated in a shut framework. That implies on the off chance that we have a substance response, the measure of every component should be something similar in the beginning materials and the items.

Complete answer:
John Dalton$1808$ , accepted that matter is composed of amazingly minute resolute particles, called molecules which participate in substance responses. This molecule can now not be made nor be obliterated. Hence, option C is correct.
Benefits of Dalton's Atomic Theory:
The nuclear hypothesis clarifies the laws of substance blend (the Law of Constant Composition and the Law of Multiple Proportions). Dalton was the main individual to perceive a serviceable differentiation between the central molecule of a component and that of a compound (atom).

Note:
Disadvantages of Dalton's Atomic Theory:
The unbreakable quality of a particle was refuted: a molecule can be additionally partitioned into protons, neutrons and electrons. Anyway an iota is the littlest molecule that participates in compound responses.
As indicated by Dalton, the particles of the same component are comparable in all regards. Notwithstanding, molecules of certain components shift in their masses and densities. These iotas of various masses are called isotopes. For instance, chlorine has two isotopes with mass numbers thirty five and thirty seven.
Dalton also affirmed that particles of different segments are unmistakable in all respects. This has been discredited in explicit cases: argon and calcium particles each have an atomic mass $40$ amu. These particles are known as isobars.
As indicated by Dalton, iotas of various components consolidate in straightforward entire number proportions to shape compounds. This isn't seen in complex natural mixtures like sugar.
The hypothesis neglects to clarify the presence of allotropes; it doesn't represent contrasts in properties of charcoal, graphite, precious stone.