MCQ
Methanides are
- A$Mg_2\,C_3,Be_2\,C, Al_4\,C_3$ and $CaC_2$
- B$Mg_2\,C_3, Be_2\,C$ and $Al_4\,C_3$
- C$Be_2\,C, Al_4\,C_3$ and $CaC_2$
- ✓$Be_2\,C$ and $Al_4\,C_3$
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$3 \mathrm{PbCl}_2+2\left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4 \rightarrow \mathrm{Pb}_3\left(\mathrm{PO}_4\right)_2+6 \mathrm{NH}_4 \mathrm{Cl}$
If $72 \mathrm{mmol}$ of $\mathrm{PbCl}_2$ is mixed with $50 \mathrm{mmol}$ of$\left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4$, then amount of $\mathrm{Pb}_3\left(\mathrm{PO}_4\right)_2$ formed is......... mmol. (nearest integer)
$A.6{H_2}{O_{\left( s \right)}} \rightleftharpoons A.2{H_2}{O_{(s)}} + \mathop {4{H_2}{O_{(g)}}};{{K_P} = 1.6 \times {{10}^{ - 11}}} $
$B.12{H_2}{O_{\left( s \right)}} \rightleftharpoons B.7{H_2}{O_{(s)}} + \mathop {5{H_2}{O_{(g)}}};{{K_P} = 2.43 \times {{10}^{ - 13}}} $
$B.10{H_2}{O_{\left( s \right)}} \rightleftharpoons {C_{(s)}} + \mathop {10{H_2}{O_{(g)}}};{{K_P} = {{10}^{ - 30}}} $
Aqueous tension of $H_2O$ at $0\,^oC$ is given as $0.76\ torr$
$(I)$ The most effective drying agent will be $C_{(s)}$. Out of $C_{(s)}$ , $B. 7H_2O_{(s)}$ & $A. 2H_2O_{(s)}$
$(II)$ At $0\,^oC$, $A.6H_2O_{(s)}$ & $B.12H_2O_{(s)}$ will
$(III)$ If $R.H$ is less than $100\%$ in a chamber at $0\,^oC$, then none of the substance can act as deliquescent