Question

1. which of the following is a pure substance? mark all that apply air salt (nacl) salad soda

Explanation:

A pure substance has a definite and constant composition. Air is a mixture of gases like nitrogen, oxygen etc. Salad is a mixture of various vegetables and other ingredients. Soda is a mixture of water, carbon - dioxide, sugars and flavorings. Salt (NaCl) is a compound with a fixed chemical composition, making it a pure substance.

Answer:

B. Salt (NaCl)