First slide

Group-17 or Halogen family

Question

Which one of the following pairs of reactants does not form oxygen when they react with each other?

Moderate

A

F₂,NaOH solution (hot, conc.)
B

F₂, H₂O
C

Cl₂, NaOH solution (cold, dilute)
D

CaOCl₂, H₂SO₄ (dilute, small amount)

Solution

$\underset{(Hot, conc)}{2 F_{2} + 4 NaOH ⟶ 4 NaF + 2 H_{2} O + O_{2}} \begin{array}{l} 2 F_{2} + 2 H_{2} O ⟶ 4 HF + O_{2} \\ {Cl}_{2} + 2 NaOH ⟶ NaCl + NaClO + H_{2} O \\ 2 {CaOCl}_{2} + H_{2} {SO}_{4} ⟶ {CaCl}_{2} + {CaSO}_{4} + 2 HCl + O_{2} \end{array}$

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