CHEMISTRYHALOGENSCBT

CHEMISTRY CBT – HALOGENS

Time Left: 1800 seconds

Score: 0/40

---

---

Theory Questions

1. Write electronic configuration of chlorine and explain its reactivity.

Chlorine = 2,8,7. It needs one electron to complete octet → very reactive.

2. Describe physical properties of halogens.

They are coloured non-metals, diatomic molecules, low melting points, density increases down group.

3. Write balanced equation for preparation of chlorine in lab.

MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O

4. Explain displacement reaction among halogens.

More reactive halogen displaces less reactive one. Example: Cl₂ + 2KBr → 2KCl + Br₂

5. List three uses of chlorine.

Water purification, bleaching, manufacture of PVC.