MCQ
The Vant Hoff factor for a dilute solution $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right].$
- A$10$
- ✓$4$
- C$5$
- D$0.25$
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$Pt(s) |H_2(g)\,|\,HCOOH(aq.)\,||\,CH_3COOH(aq.)\,|\,H_2(g)|Pt(s)$
at $25\,^o C$ is ............ $\mathrm{V}$
$(K_a$ of $HCOOH \,= 2.4 × 10^{-4}$ , $K_a$ of $CH_3COOH = 1.8 × 10^{-5}$ , $log\,2\, = 0.3,\, log \,0.48, \frac{2.303 \times 298 \times R}{F} = 0.06)$
Reason : Zinc is a powerful reducing agent than copper.
$B$ reacts with Hydroxyl amine but does not give Tollen's test. Identify $A$ and $B$