Question

Which one of the following pairs of reactant(s) form oxygen when they react with each other ?

• A. $F_2,$ NaOH solution (hot, concentrated)
• B. $F_2,H_{2}O$
• C. $C{l}_2,NaOH$ solution (cold, dilute)
• D. $CaOC{l}_2,H_{2}S{O}_4$ (dilute, small amount)

Answer 1

Answer: (A), (B), (D)

$CaOC{l}_2,H_{2}S{O}_4$ (dilute, small amount)

The reactions are as follows:
(a) $2F_2+4NaOH\to 4NaF+2H_{2}O+O_2$
(b)
$2F_2+2H_{2}O\to 4HF+O_2$
(c) $C{l}_2+2NaOH\to NaCl+NaClO+H_{2}O$
(d) $2CaOC{l}_2+H_{2}S{O}_4\to CaC{l}_2+CaS{O}_4+2HCl+O_2]$
Hence, the correct answers are option (a),(b) and (d).