Multiple choice

Which of the following equations follows 'Law of conservation of matter'?

  1. $KNO_3$ $\to$ $KNO_2$ + $O_2$
  2. $K_2Cr_2O_7$ + 14HCl $\to$ 2KCl + $CrCl_3$ + $7H_2O$ + $3Cl_2$
  3. $2Pb\left(NO_ 3\right)_ 2 \to 2PbO + 4NO_2 + O_2$
  4. 2NaOH + $H_2SO_4$ $\to$ $Na_2SO_4$ + $2H_2O$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In option (3), quantity of reactants is equal to quantity of products formed.

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