Passage IV

Table 1 lists data about metal elements arranged in order of increasing atomic number (the number of protons contained in one atom). The melting point is the temperature at which a solid metal liquefies. An electrically neutral atom has an equal number of protons (positively charged particles) and electrons (negatively charged particles). A positive ion is formed when an atom loses one or more electrons. The first ionization energy is the energy that removes one electron from the neutral atom to form a＋1 ion. The atomic radius and ionic radius indicate the size of the neutral atom and of the +2 ion, respectively.

19. When iron ore is reacted with coke and limestone at a high temperature, iron (Fe) is produced in its molten (liquid) state. At which of the following temperatures can the Fe be drained or poured out of the reactor?

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

Looking at Table 1, it is found that the melting point of iron is 1535 degrees, that is to say, if the iron can be poured out, it must remain liquid and the temperature must be higher than 1535 degrees, so choose D