Mode in the following scale: defgabcd?

Questions

Which wife of Ahasuerus of Persia risked her life to save her people from Hamans plot to have them killed?

From which opera does the aria O Fortuna come?

What was the name of the demarcation line proposed in 1919 which formed the basis for the Soviet-polish border after the second world war?

In 1969 which singer recorded a best selling album during a television documentary at San Quentin prison?

How did racey Emin shock the art world in 1999?