Sulphuric acid is produced by Contact process. The raw materials are: MCQ with Answer and Explanation

Explanation:
Oxidation is defined as the loss of electrons (or an increase in oxidation state). A reducing agent is a substance that donates electrons to another species, thereby causing the other species to be reduced. In doing so, the reducing agent itself gets oxidized. Thus, statement 1 is correct, but 2 is incorrect.

Explanation:
The modern periodic law, established by Henry Moseley, states that the properties of elements are periodic functions of their atomic numbers. Mendeleev’s original table was based on atomic mass, but the modern version uses atomic number which resolves anomalies like Ar (Z=18, mass 40) and K (Z=19, mass 39).

Explanation:
Rutherford's gold foil experiment (1911) showed that most of the atom is empty space with a dense positively charged nucleus. Thomson proposed the plum pudding model; Bohr gave quantized orbits; Dalton gave solid sphere model.