$42.$ Calcium in Calcium Ammonium Nitrate aids in:

$-$ A$)$ Reducing soil acidity

$-$ B$)$ Enhancing water retention

$-$ C$)$ Strengthening plant cell walls

$-$ D$)$ Increasing nitrogen fixation

$43.$ The environmental impact of synthetic ammonia includes:

$-$ A$)$ Decreasing nitrogen in the atmosphere

$-$ B$)$ Increasing atmospheric carbon dioxide levels

$-$ C$)$ Reducing soil fertility

$44.$ Considering the production of phosphoric acid $($H$$PO$)$ from phosphate rock, if the reaction efficiency is $80\%$ and $1000$ kg of phosphate rock is used, which contains $30\%$ phosphorus by mass, how much phosphoric acid can be produced, assuming all phosphorus is converted to phosphoric acid? $($Molar mass: P $=31$ g$/$mol$,$ H$$PO$=98$ g$/$mol$)$

$-$ A$)252\mathrm{.}6$ kg

$-$ B$)300$ kg

$-$ C$)400$ kg

$-$ D$)750$ kg

$45.$ A field requires an application of $30$ kg of phosphorus. If a farmer decides to use triple super phosphate $($TSP$)$ which contains $46\%$ phosphorus by weight, how much TSP should be applied to meet the phosphorus requirement?

$-$ A$)65\mathrm{.}2$ kg

$-$ B$)75$ kg

$-$ C$)100$ kg

$-$ D$)150$ kg