Do yeast bread contains baking powder?

Neither baking soda nor baking powder is a yeast, but each is a leavening agent. In addition, baking powder contains cornstarch, which those who observe Passover strictly do not consume.

It is correct to say that baking soda and baking powder both are not yeast as yeast is a living fungus. Yeast however is also a leavening agent.

Baking soda is bicarbonate of soda or sodium bicarbonate and it's chemical compound formula is NaHCO3.

Baking powder is a combination of bicarbonate of soda, corn starch, & usually 2 acids depending on the type of baking powder.

Also those who observe Passover do not eat leavened bread, which is bread made without any leavening agent be it baking powder, baking soda, or yeast. Generally unleavened bread for passover is baked with a dough made of flour, water, & salt. (NO LEAVENING AGENT WHATSOEVER)