Question

Cr(OH)4(aq) → CrO42(aq)

How many hydroxide ions are needed to balance it?

(A) 1 hydroxide ion, on the left side

(B) 3 hydroxide ions, on the right side

(C) 3 hydroxide ions, on the left side

(D) 4 hydroxide ions, on the left side

(E) 4 hydroxide ions, on the right side

Answer 1

Answer:

option is (e)

Explanation:

• because on lhs side numbers are more than rhs so that's why we are taking 4 on rhs

Answer 2

Answer:

option is E

Explanation:

reaction taking place in basic media cr(OH)4(aq) --> crO4^-2(aq).

How many electrons are needed to balance it?

Balancing Redox Reaction in Basic Media

In a basic environment, there are no excess protons, so protons cannot be used to balance hydrogen in the half-equation. Instead, hydroxide is used in conjunction with water molecules to balance hydrogen and maintain the balancing of oxygen