Atoms And Molec...

H₂O, obtained from different sources, always contains hydrogen and oxygen atoms in the respective ratio of 2 : 1. This is in accordance with which of the following?

Which among the following illustrate the law of reciprocal proportions?

Nitrogen and oxygen form three oxides.

In oxide I, 1.00 g of nitrogen combines with 0.57 g of oxygen.
In oxide II, 2.00 g of nitrogen combines with 2.24 g of oxygen.
In oxide III, 3.00 g of nitrogen combines with 5.11 g of oxygen.

These results are in accordance with which of the following?

Nitrogen and hydrogen react to form ammonia, as shown below:

N₂ (g) + 3H₂ (g) → 2NH₃ (g)

The volume of hydrogen required to react completely with 10 L of N2 and the volume of NH3 produced, respectively, are

According to Dalton's theory, which of the following particles is indivisible and cannot be created or destroyed in a chemical reaction?

Which of the following statements contradict Dalton's atomic theory?

(A) A chemical change involves rearrangement of atoms.
(B) Atoms form ions by gain or loss of electrons.
(C) The number of atoms may change when a substance changes from solid to gaseous state.
(D) The total number of atoms during a chemical change remains unaltered.

Two elements, X and Y, have 5 and 7 valence electrons, respectively. What will be the most probable formula of the compound formed by them?

The atomic numbers of four elements - A, B, C and D - are 6, 8, 10 and 12, respectively. The two elements which can react to form an ionic bond are

The gaseous hydrocarbon acetylene, C₂H₂, used in welder's torches, releases 1300 KJ when 1 mole of C₂H₂ undergoes combustion. Which of the following statements is not true?