Write a Balanced Chemical Equation for the Oxidation of Solid $\ell$

Multiple Choice

Write a balanced chemical equation for the oxidation of solid cadmium by concentrated nitric acid, producing nitrogen dioxide gas and Cd²⁺(aq) ion.

A) HNO₃(aq) + Cd(s) ? Cd²⁺(aq) + NO₂(g) + OH^-(aq)
B) 2 HNO₃(aq) + Cd(s) ? Cd²⁺(aq) + 2 NO₂(g) + 2 OH^-(aq)
C) HNO₃(aq) + Cd(s) + H⁺(aq) ? Cd²⁺(aq) + NO₂(g) + H₂O( $\ell$ )
D) 4 HNO₃(aq) + Cd(s) ? Cd²⁺(aq) + 2 NO₂(g) + 2 H₂O( $\ell$ ) + 2 NO₃^-(aq)
E) HNO₃(aq) + Cd(s) ? Cd²⁺(aq) + NO₂(g)