What is inert pair effect?

Chalcogens belongs to p-block. Give reason.

Explain why fluorine always exhibit an oxidation state of -1?

Give the oxidation state of halogen in the following.
a) OF₂
b) O₂F₂
c) Cl₂O₃
d) I₂O₄

Why fluorine is more reactive than other halogens?

What is the hybridisation of iodine in IF₇? Give its structure.

How will you prepare chlorine in the laboratory?

Give a reason to support that sulphuric acid is a dehydrating agent.

Write the molecular formula and structural formula for the following molecules.
a) Nitric acid
b) Dinitrogen pentoxide
c) phosphoric acid (PTA)
d) phosphine

Give the uses of argon.

Write the valence shell electronic configuration of group-15 elements.

Give two equations to illustrate the chemical behaviour of phosphine.

Give a reaction between nitric acid and a basic oxide.

What happens when PCl₅ is heated?

Suggest a reason why HF is a weak acid, whereas binary acids of the all other halogens are strong acids.

Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

What type of hybridisation occur in
a) BrF₅
b) BrF₃

Complete the following reactions.
\(1. \mathrm{NaCl}+\mathrm{MnO}_{2}+\mathrm{4H}_{2} \mathrm{SO}_{4} \longrightarrow \)
\(2. \mathrm{NaNO}_{2}+\mathrm{HCl} \longrightarrow \)
\(3.\mathrm{P}_{4}+\mathrm{3NaOH}+\mathrm{3H}_{2} \mathrm{O} \longrightarrow \)
\(4. \mathrm{AgNO}_{3}+\mathrm{PH}_{3} \longrightarrow \)
\(5. \mathrm{Mg}+\mathrm{10HNO}_{3} \longrightarrow \)
\(6. \mathrm{KClO}_{3} \stackrel{\Delta}{\longrightarrow} \)
\(7. \mathrm{Cu}+Con. \ Hot \ \mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow\)
\(8. \mathrm{Sb}+\mathrm{Cl}_2 \longrightarrow \)
\(9. \mathrm{HBr}+\mathrm{H}_2 \mathrm{SO}_4 \longrightarrow \)
\(10. \mathrm{XeF}_6+\mathrm{H}_2 \mathrm{O} \longrightarrow \)
\(11. \mathrm{XeO}_6{ }^{4-}+\mathrm{Mn}^{2+}+\mathrm{H}^{+} \longrightarrow \)
\(12. \mathrm{XeOF}_4+\mathrm{SiO}_2 \longrightarrow \)
\(13. \mathrm{Xe}+\mathrm{F}_2 \frac{\mathrm{Ni} / 200 \mathrm{~atm}}{400^{\circ} \mathrm{C}}\).