Passage II
In the periodic table, a column of elements is called a group. For each of 5 elements in Group 2A and for each of 5 elements in Group 3A, Table 1 gives the atomic mass (average mass of 1 atom in atomic mass units, amu) and 3 other properties at a temperature of 298 K:
• density,
• specific heat (amount of heat required to raise the temperature of 1 g of a substance by 1 K),
• thermal conductivity (ability to conduct heat; the greater the thermal conductivity, the more effectively the substance conducts heat).
Figure 1 shows, for Al and for Mg, how the thermal conductivity varies between 1 K and 100 K.
11. Neither Table 1 nor Figure 1 gives the thermal conductivity of magnesium at which of the following temperatures?
Your Answer is
Correct Answer is C
Explanation
All given in Table 1 are the thermal conductivity of elements at 298K, while Figure 1 shows the thermal conductivity of Mg from 0-100K, so 200K is not within this range.