E. Which of the following is a mixture? i. Water ii. Hydrogen iii. Air iv. Iron​

water is known as the mixture

iv. Iron

water is not a mixture

hydrogen is the simplest element

air is pure

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.