Which of the following is not a base?
a. ammonia
b. potassium chloride
c. sodium bicarbonate
d. sodium hydroxide​

Iron is a solid,hard and metallic element that is used as a construction material for building houses.it boils at 2862degrees centrigrade. oxygen is a gaseous,nonmetallic element that we use for breathing temperature is -183degrees celcius.when iron is exposed in the air,it reacts with oxygen.this process produce rust, which has a chemical name ferric oxide and boils at 1987degrees celcius.which of the following statement is true about the materila mentioned above? ​a.rust or ferric oxide is a solutiob.rust of ferric oxude is a substancec.the materials does not boil at a particular temperatured.the resulting product of the reaction between iron and oxygen is a mixture