CHEMISTRY · Single correct · CBSE · Chemistry · Chemical Reactions and Equations · Chemical Reactions and Equations
Problem
Two beakers contain separate aqueous solutions. Beaker X contains equal numbers of blue spheres (Na+) and paired red spheres (CO32−). Beaker Y contains equal numbers of green spheres (H+) and white spheres (Cl−) closely associated in pairs. When the contents of the two beakers are combined, vigorous bubbling occurs, and the remaining solution contains only blue and white spheres moving independently. Which statement best describes the chemical process responsible for the bubbling?
(a) A precipitation reaction in which NaCl forms as an insoluble solid
(b) A gas-evolution reaction in which CO32− ions react with H+ ions to produce CO2(g)
(c) An acid–base neutralization that forms only liquid H2O
(d) A redox reaction in which Cl− ions are oxidized to Cl2(g)