MCQ
By adding gypsum to cement:
- ✓Setting time of cement becomes less.
- BSetting time of cement increases.
- CColour of cement becomes light.
- DShining surface is obtained.
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$C{O_{2(s)}} + {H_{2(g)}} \rightleftharpoons C{O_{(s)}} + {H_2}O(g)\,;\,{K_1}$
$C{O_{2(s)}} + CO(g) \rightleftharpoons C{O_{(s)}} + C{O_2}(g)\,;\,{K_2}$
Calculate the equilibrium for the reaction
$C{O_{2(s)}} + {H_2}(g) \rightleftharpoons CO(g) + {H_2}O(g)\,$
$CH_3-CH_2-C \equiv CH + HCl \to B \xrightarrow{{HCl}} C$
${{O}_{(g)}}+{{e}^{-}}=O_{(g)}^{-}\Delta {{H}^{o}}=-142\ kJ\,mo{{l}^{-1}}$
$O_{(g)}^{-}+{{e}^{-}}=O_{(g)}^{2-}\Delta {{H}^{o}}=844\ kJ\,mo{{l}^{-1}}$