Which of the following happens during a chemical reaction?
2 answers:
Answer: Option (c) is the correct answer.
Explanation:
A chemical reaction is defined as the reaction that leads to formation of new substances through exchange of electrons.
For example,
Here, aluminium on displacing copper from copper chloride leads to the formation of a new compound, that is, aluminium chloride.
Hence, it shows that atoms of reactant molecules rearrange themselves to form new substances.
Thus, we can conclude that during a chemical reaction atoms of reactants rearrange to form new substances .
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For Iron: 
For Oxygen:
These are the two chemical symbols for the two elements found in Iron Oxide.
For Oxygen:
These are the two chemical symbols for the two elements found in Iron Oxide.
Explanation:
(a) potassium oxide with water
According to reaction,1 mole of potassium oxide reacts with 1 mole of water to give 1 mole of potassium hydroxide.
(b) diphosphorus trioxide with water
According to reaction,1 mole of diphosphorus trioxide reacts with 2 moles of water to give 2 moles of phosphorus acid.
(c) chromium(III) oxide with dilute hydrochloric acid,
According to reaction,1 mole of chromium(III) oxide reacts with 6 moles of hydrochloric acid to give 2 moles of chromium(III) chloride and 3 moles of water.
(d) selenium dioxide with aqueous potassium hydroxide
According to reaction,1 mole of selenium dioxide reacts with 2 moles of potassium hydroxide to give 1 mole of potassium selenite and 1 mole of water.