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Chemistry
Which of the following represents correct formation reaction?
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Q. Which of the following represents correct formation reaction?
NTA Abhyas
NTA Abhyas 2020
A
$\left(Ca\right)^{2 +}\left(\right.aq\left.\right)+CO_{3}^{2 -}\left(\right.aq\left.\right) \rightarrow \left(CaCO\right)_{3}\left(\right.s\left.\right)$
B
$4Al\left(\right.s\left.\right)+3O_{2}\left(\right.g\left.\right) \rightarrow 2\left(Al\right)_{2}O_{3}\left(\right.s\left.\right)$
C
$\frac{1}{2}H_{2}\left(\right.g\left.\right) \rightarrow H^{+}\left(\right.aq\left.\right)+1e^{-}$
D
$CO\left(\right.g\left.\right)+\frac{1}{2}O_{2}\left(\right.g\left.\right) \rightarrow \left(CO\right)_{2}\left(\right.g\left.\right)$
Solution:
Theory based