Atoms and Molec...

How many times is an atom of Sulphur heavier than an atom of Carbon?

What is the atomicity of ammonia?

An element X has valency 3 while the element Y has valency 2. Write the formula of the compound formed by X and Y.

An element A forms an oxide with formula A₂O₃. What is its valency?

Match the following with the correct response:

Match the following with the correct response:

Match the following with the correct response:

What according to Dalton’s atomic theory is true among the following:
(a) Atom is divisible into protons, electrons and neutrons.
(b) Atoms of the same element have different atomic masses.
(c) Atoms are the ultimate indivisible particle of matter.
(d) Atoms of the same element have same atomic masses, size and chemical properties.

During a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is known as ______________.

Which of the two statements is true?

Statement A : Atoms can exist independently.

Statement B : The law of constant proportions is applicable only to pure chemical compounds.