MCQ
A hydroxide of metal, which is soluble in conc. sodium hydroxide solution is:
- Amagnesium hydroxide
- ✓lead hydroxide
- Ccopper hydroxide
- Diron (II) hydroxide
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| Reactants | Gas released |
| (i) $Na _2 SO _3+2 HCl$ | (p) $CO _2$ |
| (ii) $CuO +2 HCl$ | (q) $SO _2$ |
| (iii) $Ca \left( HCO _3\right)_2+2 HCl$ | (r) $H _2 S$ |
| (iv) $FeS +2 HCl$ | (s) No gas |