MCQ
Lead pipes are corroded quickly by
- ADil. ${H_2}S{O_4}$
- BConc. ${H_2}S{O_4}$
- ✓Acetic acid
- DWater
$Pb + 2C{H_3}COOH + \frac{1}{2}{O_2} \to Pb{(C{H_3}COO)_2} + {H_2}O$
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$N{O_{\left( g \right)}} + \frac{1}{2}{O_2}_{\left( g \right)} \rightleftharpoons N{O_2}_{\left( g \right)}$
Given : $\Delta G^o_f (NO_2) = 52.0\, KJ/mole$
$\Delta G^o_f (NO) = 87.0\, KJ/mole$
$\Delta G^o_f (O_2) = 0\, KJ/mole$
$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
Assertion $(A) :$ Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason $(R)$ $:$ It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.
In the light of the above statements, choose the most appropriate answer from the options given below :