P-Block Elements – JEE Main 2026 Quiz

Q1. Element not showing variable oxidation state is:

Q2. 1 mole of PbS is oxidised by X moles of O₃ to give Y moles of O₂. Find X + Y.

Q3. Gas giving brown precipitate with Nessler’s reagent is:

Q4. Group 15 element forming dπ–dπ bond and strongest basic hydride has atomic number:

Q5. Lassaigne’s extract is boiled with dil. HNO₃ before testing for halogens because:

Q6. For boron: x = neutrons in most abundant isotope, y = oxidation state in oxide. Find x + y.

Q7. Total number of oxygen atoms in X and Y:

Na₂O + H₂O → 2X
Cl₂O₇ + H₂O → 2Y

Q8. Nature of TeO₂ and TeH₂ respectively are:

Q9. Incorrect atomic radius pair in group 13 gives element X (M³⁺ larger). Atomic number of X:

Q10. On reaction of PbS with dilute nitric acid, which is NOT formed?