3. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
4. What are the number of moles of CO2 which contains 16 g of oxygen?
5. The molecule which has the highest percentage of ionic character among the following is
6. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called