MCQ
$'A'$ and $'B'$ in the following reactions are ${image}$


- A

- B

- ✓

- D








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| List $-I$ (Compounds) | List $-II$ (used in) | ||
| $(A)$ | $BaSO_4 +ZnS$ | $(1)$ | Explosive |
| $(B)$ | $NI_3$ | $(2)$ | Oxidiser in rocket propellants |
| $(C)$ | $N_2O_4$ | $(3)$ | Space capsule |
| $(D)$ | $KO_2$ | $(4)$ | Pigment |
| Column $-1$ | Column $-2$ |
| $(A)$ Haber's process for ammonia | $(P)$ Zeolite |
| $(B)$ Oswald's process for $HNO_3$ | $(Q)$ $Fe$ |
| $(C)$ Contact processf $H_2SO_4$ | $(R)$ $ V_2O_5$ |
| $(D)$ Cracking of hydrocarbons | $(S)$ $Pt$ gauge |