True or False : Not all metals are ferromagnetic-only the ones with iron,
nickel, or cobalt. *

yes it's true ! only three elements iron, cobalt and nickel are ferromagnetic

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.