Question

balance the equation:-KNO3 ---->KNO2+O2

Answer 1

KNO3        ----->  KNO2  +    O2

   LHS                               RHS
                        
K=1x2=2                       K=1x2=2 
N=1X2=2                      N=1x2=2
O=3x2=6                      O=2x2+2=6


2KNO3---------->2KNO2  +  O2

Answer 2

The balanced reaction is-

$2KNO_3\rightarrow 2KNO_2+O_2$.

• On heating potassium nitrate decomposes to produce potassium nitrite along with oxygen gas.
• The balanced chemical equation of the reaction is as follows-
• $2KNO_3\rightarrow 2KNO_2+O_2$
• From the above-balanced reaction, we can say that on heating two moles of potassium nitrate decomposes to produce two moles of potassium nitrite along with one mole of oxygen gas.