engineering recuitment NFC Chemical Plant Operator Mock Test General Science Chemistry Chemical Reaction
Which of the following statements is NOT true regarding chemical reactions?
1
A chemical reaction is in which the bonds are broken within reactant molecules, and new bonds are formed within product molecules in order to form a new substance.
2
Burning of the candle is a physical change only because state of wax changes.
3
In a physical change, there is basically a change of state of the substance but in the case of a chemical change mostly a new substance is formed in which either energy is given off or absorbed.
4
Chemical changes are accompanied by certain physical changes.