What is the purpose of adding alum and lime to water during the process of water treatment
a. to cause particles in the water to clump together so that they can be removed
b. to increase the turbidity of water and raise its dissolved oxygen content
c. to kill unwanted bacteria in the water to prevent illness in humans
d. to lower the ph of the water to make it suitable for people to drink

A

Explanation:

Addition of Alum and lime helps clump particles for easy filtering process and seiving.

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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.