31. Given the bright-line spectra of four elements and the spectrum of a mixture formed from two of these elements:
Which two elements are present in this mixture? (1) A and Q (2) A and E
(3) G and Q
(4) G and E
Explanation: To do this problem correctly, we need to match lines in the known elements in our unknown mixture. As I have shown in the picture above, element A and Q match to the mixture of two elements
Answer: 1