Which one of the following groups consists of only compounds?

مندرجہ ذیل میں سے کون سا گروپ صرف مرکبات پر مشتمل ہے؟

Salad, nickel, water, salt

Baking soda, water, salt

Iron, ink, washing soda

None of these

Compounds are substances made of two or more elements chemically bonded.

Baking soda (NaHCO₃), water (H₂O), and salt (NaCl) are all compounds.

Nickel and iron are elements, and salad and ink are mixtures.