Answer:
C ) KOH + HBr → KBr + H₂O
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
C ) KOH + HBr → KBr + H₂O
in this equation there are equal number of atoms of each elements in both side so it means mass remain conserved.
While in other equations,
A) SnO₂ + H₂ → Sn + 2H₂O
There are two hydrogen atoms on left side while four on the right side so mass is not conserved.
B) 2C + O₂ → CO₂
There are two carbon atom on left side while one on right side. So this is also incorrect option.
C) 6Cs + N₂ → 6Cs₃N
There are six Cs atoms on left side while 18 on right side. So this is also incorrect option.
