Final answer:
The correct coefficients for the balanced equation H2SO4 + 2 NaNO2 → 2 HNO2 + Na2SO4 are 1:2:2:1. This represents the stoichiometric ratio in which the reactants combine and the products are formed.
Step-by-step explanation:
The coefficients in the balanced equation H2SO4 + 2 NaNO2 → 2 HNO2 + Na2SO4 are 1:2:2:1. This means that one mole of sulfuric acid (H2SO4) reacts with two moles of sodium nitrite (NaNO2) to produce two moles of nitrous acid (HNO2) and one mole of sodium sulfate (Na2SO4). Each substance in the equation is represented by a number which stands for its coefficient, indicating the ratio in which substances react or are produced.
When looking at Option d (2:4:2:2:2:4), it seems to contain too many numbers than there are reactants and products in the equation provided, which makes it incorrect. The correct option is therefore c. 1:2:2:1.