MCQ
Which of the following order is not correct
- A$Zn > Cd > Hg$ Heat of atomisation
- B$Mn_2O_7 > MnO_2 > MnO$ Acidic strength
- C$CrO_3 > MoO_3 > WO_3$ oxidising nature
- ✓$HgCl_2 > CdCl_2 > ZnCl_2$ Ionic character
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For the reaction $3 CaO +2 Al \rightarrow 3 Ca + Al _{2} O _{3}$ the standard reaction enthalpy $\Delta_{ r } H ^{0=}$ .......... $kJ$.
(Round off to the Nearest Integer).


Assertion $(A)$ $:$ When Cu $(II)$ and sulphide ions are mixed, they react together extremely quickly to give a solid.
Reason $(R)$ $:$ The equilibrium constant of $Cu ^{2+}( aq )+ S ^{2-}( aq ) \rightleftharpoons \operatorname{CuS}( s )$ is high because the solubility product is low.