MCQ
The main pigment for the absorption of light in plants is chlorophyll which contains:
- ✓$Mg$
- B$Mn$
- C$Ca$
- D$Fe$
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Reason : In presence of $H_2SO_4$, $HNO_3$ acts as a base and produces $NO_2^+$ ions.
$CH_4(g) +2O_2(g) \rightarrow CO_2(g)+2H_2O(l)\,;$ $\Delta H= -890 \,kJ$
$CO_2(g) \rightarrow C($graphite$) + O_2(g) \,;$ $\Delta H= 393 \,kJ$
$2H_2O(l) \rightarrow 2H_2(g) + O_2(g) \,;$ $\Delta H= 571 \,kJ$
$2H_2(g) \rightarrow 4H(g)\, ;$ $\Delta H= 871\, kJ$
$C($graphite$) \rightarrow C(g)\, ;$ $\Delta H= 716\, kJ$