2. 3. 4. 5. III. READ THE FOLLOWING PASSAGE AND MARK THE LETTE...
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III. Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of
the questions.
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct
answer to each of the questions .
Hydrogen is the most common element in the universe and was perhaps the first to form. It is among the ten
most common elements on Earth as well and one of the most useful for industrial purposes. Under normal
conditions of temperature, hydrogen is a gas. Designated as H, hydrogen is the first element in the periodic table
because it contains only one proton. Hydrogen can combine with a large number of other elements, forming more
compounds than any of the others. Pure hydrogen seldom occurs naturally, but it exists in most organic
compounds, that is, compounds that contain carbon, which account for a very large number of compounds.
Moreover, hydrogen is found in inorganic compounds. For example, when hydrogen burns in the presence of
oxygen, it forms water.
The lightest and simplest of the elements, hydrogen has several properties that make it valuable for many
industries. It releases more heat per unit of weight than any other fuel. In rocket engines, tons of hydrogen and
oxygen are burned, and hydrogen is used with oxygen for welding torches that produce temperatures as high as