MCQ
The aqueous solution of which of the following salt has the lowest $pH$
- A$NaClO$
- B$NaCl{O_2}$
- C$NaCl{O_3}$
- ✓$NaCl{O_4}$
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Which of the following arrangements gives the correct order of decreasing stability of the above-mentioned resonance contributors?
$(A)$ the reaction of $Al _2 O _3$ with coke ($C$) at a temperature $>2500^{\circ} C$.
$(B)$ the neutralization of aluminate solution by passing $CO _2$ gas to precipitate hydrated alumina $\left( Al _2 O _3 .3 H _2 O \right)$
$(C)$ the dissolution of $Al _2 O _3$ in hot aqueous $NaOH$.
$(D)$ the electrolysis of $Al _2 O _3$ mixed with $Na _3 AlF _6$ to give $Al$ and $CO _2$.