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

C l_{2}, N a O H

solution (cold, dilute)

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F_{2},

NaOH solution (hot, concentrated)

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C a O C l_{2}, H_{2} S O_{4}

(dilute, small amount)

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F_{2}, H_{2} O

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Solution

The correct option is D $F_{2}, H_{2} O$
The reactions are as follows:
(a) $2 F_{2} + 4 N a O H \to 4 N a F + 2 H_{2} O + O_{2}$
(b)
$2 F_{2} + 2 H_{2} O \to 4 H F + O_{2}$
(c) $C l_{2} + 2 N a O H \to N a C l + N a C l O + H_{2} O$
(d) $2 C a O C l_{2} + H_{2} S O_{4} \to C a C l_{2} + C a S O_{4} + 2 H C l + O_{2}]$
Hence, the correct answers are option (a),(b) and (d).

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

The correct option is D F2,H2O The reactions are as follows: (a) 2F2+4NaOH→4NaF+2H2O+O2 (b) 2F2+2H2O→4HF+O2 (c) Cl2+2NaOH→NaCl+NaClO+H2O (d) 2CaOCl2+H2SO4→CaCl2+CaSO4+2HCl+O2] Hence, the correct answers are option (a),(b) and (d).