MCQ
Which of the following reactions involves oxidation-reduction
- A$NaBr + HCl\, \to \,NaCl + HBr$
- B$HBr + AgN{O_3}\, \to \,AgBr + HN{O_3}$
- ✓${H_2} + B{r_2}\, \to \,2HBr$
- D$2NaOH + {H_2}S{O_4}\, \to \,N{a_2}S{O_4} + 2{H_2}O$

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${K_p} = 8 \times {10^{ - 2}}$$C{O_{2(g)}} + {C_{(s)}} \to 2C{O_{(g)}}$ ; ${K_p} = 2$
$CaC{{O}_{3(s)}}\xrightarrow{\Delta }Ca{{O}_{(s)}}+C{{O}_{2}}\uparrow $; ${{K}_{p}}=8\times {{10}^{-2}}$
| Column $I$ | Column $II$ |
| $(A)$ Silica gel | $(i)$ Transistor |
| $(B)$ Silicon | $(ii)$ Ion-exchanger |
| $(C)$ Silicone | $(iii)$ Drying agent |
| $(D)$ Silicate | $(iv)$ Sealant |