Question

Which of the following equations has correct formulas and also is a balanced equation?

A.
CaCO3 --> CaO + CO3


B.
2Be + O2 --> 2BeO


C.
Mg + O2 --> MgO2


D.
3KCl + HNO3 --> 3HCl + KNO3

Answer 1

Answer : The correct option is, (B)

Explanation :

Balance equation : Balanced equation are those equation in which the number of atoms of each element and the total charge must be same on products side and reactants side.

In the given options, only option (B) equation has correct formula and also a balanced equation.

`2Be+O_2\rightarrow 2BeO`

while the other options has incorrect formulas and also an unbalanced equations.

The correct equation for option A is,
`CaCO_3\rightarrow CaO+CO_2`

The correct equation for option C is,
`2Mg+O_2\rightarrow 2MgO`

The correct equation for option D is,
`KCl+HNO_3\rightarrow HCl+KNO_3`

Hence, the correct answer is, (B)
`2Be+O_2\rightarrow 2BeO`