Which of the following equations does not obey the law of conservation of mass?

Question

Which of the following equations does not obey the law of conservation of mass? (A) 4 H + O 2 arrow 2 H 2 O (B) H 2+ O arrow 2 H 2 O (C) 2 H + O 2 arrow H 2 O (D) Both (b) and (c)

Tardigrade Admin · Accepted Answer

According to law of conservation of mass, in all chemical changes the total mass of the system remains constant or in a chemical reaction, mass is neither created nor destroyed. This law was proposed by Lavoisier and tested by Landolt.

But in

(b)

and

(c)

, mass of reactants is not equal to the mass of products.

Q. Which of the following equations does not obey the law of conservation of mass?

$4 H + O_{2} \to 2 H_{2} O$

$H_{2} + O \to 2 H_{2} O$

$2 H + O_{2} \to H_{2} O$

Both (b) and (c)

Q. Which of the following equations does not obey the law of conservation of mass?

4H+O2​→2H2​O

H2​+O→2H2​O

2H+O2​→H2​O

Both (b) and (c)

$4 H + O_{2} \to 2 H_{2} O$

$H_{2} + O \to 2 H_{2} O$

$2 H + O_{2} \to H_{2} O$