Question 14 Marks
Starting from carbon dioxide how would you obtain $(a)$ A weak acid $(b)$ A fertilizer $(c)$ A highly poisonous gas $(d)$ Black particles of carbon. $[$Give balanced equations for the same$]$
Answer
View full question & answer→$(a)$ Carbonic acid from $\ce{CO_2}$ : when $\ce{CO_2}$ is dissolved in water, carbonic acid is formed.
$\ce{CO_2+ H_2O} \longrightarrow \underset{\text { Carbonic acid }}{\ce{H_2CO_3}}$
$(b) \ \ce{CO_2}$ reacts with ammonia gas to form urea $($a nitrogenous fertilizers$)$.
$\underset{\text { Ammonia }}{\ce{2NH_3} + CO_2} \longrightarrow \underset{\text { Urea [fertilizer] }}{\left[\ce{NH _2}\right]_\ce{2CO } + H_2O}$
$(c)\ \ce{CO_2}$ is reduced to a highly poisonous gas $CO$ by carbon $($coke$)$.
$\ce{CO_2+ C} \longrightarrow \underset{\text{Carbon monoxide gas}}{\ce{2CO}}$
$(d)$ Black particles of carbon : Burning magnesium bums in $\ce{CO_2}$ making use of oxygen of $\ce{CO_2}$ producing black carbon particles.
$\ce{2Mg + CO_2 \rightarrow 2 Mgo + C}$
$\ce{CO_2+ H_2O} \longrightarrow \underset{\text { Carbonic acid }}{\ce{H_2CO_3}}$
$(b) \ \ce{CO_2}$ reacts with ammonia gas to form urea $($a nitrogenous fertilizers$)$.
$\underset{\text { Ammonia }}{\ce{2NH_3} + CO_2} \longrightarrow \underset{\text { Urea [fertilizer] }}{\left[\ce{NH _2}\right]_\ce{2CO } + H_2O}$
$(c)\ \ce{CO_2}$ is reduced to a highly poisonous gas $CO$ by carbon $($coke$)$.
$\ce{CO_2+ C} \longrightarrow \underset{\text{Carbon monoxide gas}}{\ce{2CO}}$
$(d)$ Black particles of carbon : Burning magnesium bums in $\ce{CO_2}$ making use of oxygen of $\ce{CO_2}$ producing black carbon particles.
$\ce{2Mg + CO_2 \rightarrow 2 Mgo + C}$