Energetics 1999

Dekho, bas thodi GK lagao...

Most reactions which are feasiible n naturaaly occuring have -ve Delta(H) values.

H2O ka electrolytic reduction karte hain i.e. v supply engy to brk the molecule, apane aap nahi toota.

Graphite is the "Stablest" form of carbon...toh usko diamond banane ke liye extreme conditions(Pressure/Temp.) wud be required, which is wht happens under the earth.

And saturated compounds are stabler than unsaturated ones (jab tak there is no chance of aromaticity or resonce etc.)

Basically, jo reactions aren't naturally & physically feasible, will be endothermic.

if its a spontaneous reaction, the reaction is in most cases exothermic though there are exceptions.

thanks [1]