which of the following will contain convalent double between its atom a) hydrogen b) oxygen c) nacl d) cl2 pkz ans it i will give more points+ if ur ans correct mark as brainlist and give 5 votes.

oxygen

Explanation:

because all other needs one electron but for double bond must be deficiency of atleast 2 electron

Oxygen because the valency of oxygen is 2.

It belongs to the group 6 A so it has total valence electron 6, so in order to complete its valence shell it needs 2 electron.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.

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.