JEE Chemistry - MCQ Practice Questions

The oxidation state of sulfur in H₂S₂O₃ is:

Which compound shows maximum covalent character?

The pH of 10⁻⁸ M HCl solution is approximately:

The structure of XeF₄ according to VSEPR theory is:

The stability of peroxides and superoxides of alkali metals increases with increasing atomic number because:

In the extraction of iron from Fe₂O₃ using CO as reducing agent, the rate-determining step involves:

Which of the following chromium compounds would show maximum paramagnetic behavior?

The structure of [PtCl₄]²⁻ is square planar because:

Which of the following complexes would show optical isomerism?

In the context of transition metals, what does the term 'lanthanide contraction' refer to?

The stability of peroxides increases in the order:

In the preparation of potassium permanganate from pyrolusite (MnO₂), the ore is first fused with KOH. The product formed is:

The bond order between atoms in the superoxide ion O₂⁻ is:

The reaction of concentrated H₂SO₄ with carbon produces primarily:

The complex [Cr(en)₃]³⁺ exhibits optical isomerism. The number of optical isomers is:

The rate of effusion of a gas depends on:

The solubility product of Mg(OH)₂ is 1.8 × 10⁻¹¹ at 25°C. If a solution contains 0.1 M Mg²⁺ ions, what is the minimum pH required to precipitate Mg(OH)⁻ completely?

The stability of dihydrogen bond (X-H···H-Y, where X and Y are electronegative atoms) depends on several factors. Which statement is INCORRECT regarding dihydrogen bonds?