Redox Reaction By Oxidation Number Method 01 Ques5
Question:
Determine the oxidation number change method to balance the following reaction: $K_2Cr_2O_7 + Na_2SO_3 + H_2SO_4 \rightarrow Cr_2(SO_4)_3 + Na_2SO_4 + K_2SO_4 + H_2O$. What is the coefficient of $Na_2SO_3$ after balancing?
Options:
A) 3
B) 5
C) 1
D) 7
Show Answer
Answer: a
Explanation:
A) Correct, the balanced equation is $K_2Cr_2O_7 + 3Na_2SO_3 + 4H_2SO_4 \rightarrow Cr_2(SO_4)_3 + 3Na_2SO_4 + K_2SO_4 + 4H_2O$.
B) Incorrect, 5 would result in an imbalance of elements.
C) Incorrect, 1 underestimates the stoichiometry required.
D) Incorrect, 7 overestimates the amount needed for $Na_2SO_3$.
BETA
