This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.

Passage: Uranium carbides and uranium nitrides are both relatively inert semimetallic compounds that are minimally soluble in acids, react with water, and can ignite in air to form U
3O
8. Carbides of uranium include uranium monocarbide (UC), uranium dicarbide (UC
2), and diuranium tricarbide (U
2C
3). Both UC and UC
2 are formed by adding carbon to molten uranium or by exposing the metal to carbon monoxide at high temperatures. Stable below 1800 °C, U
2C
3 is prepared by subjecting a heated mixture of UC and UC
2 to mechanical stress. Uranium nitrides obtained by direct exposure of the metal to nitrogen include uranium mononitride (UN), uranium dinitride (UN
2), and diuranium trinitride (U
2N
3).
Along with uranium monocarbide and uranium dicarbide, what is a unnotable carbide of uranium?

Passage: Once at Golgotha, Jesus was offered wine mixed with gall to drink. Matthew's and Mark's Gospels record that he refused this. He was then crucified and hung between two convicted thieves. According to some translations from the original Greek, the thieves may have been bandits or Jewish rebels. According to Mark's Gospel, he endured the torment of crucifixion for some six hours from the third hour, at approximately 9 am, until his death at the ninth hour, corresponding to about 3 pm. The soldiers affixed a sign above his head stating "Jesus of Nazareth, King of the Jews" in three languages, divided his garments and cast lots for his seamless robe. The Roman soldiers did not break Jesus' legs, as they did to the other two men crucified (breaking the legs hastened the crucifixion process), as Jesus was dead already. Each gospel has its own account of Jesus' last words, seven statements altogether. In the Synoptic Gospels, various supernatural events accompany the crucifixion, including darkness, an earthquake, and (in Matthew) the resurrection of saints. Following Jesus' death, his body was removed from the cross by Joseph of Arimathea and buried in a rock-hewn tomb, with Nicodemus assisting.
What was offered to the two thieves to drink?

Passage: The similarities between Czech and Slovak led to the languages being considered a single language by a group of 19th-century scholars who called themselves "Czechoslavs" (Čechoslováci), believing that the peoples were connected in a way which excluded German Bohemians and (to a lesser extent) Hungarians and other Slavs. During the First Czechoslovak Republic (1918–1938), although "Czechoslovak" was designated as the republic's official language both Czech and Slovak written standards were used. Standard written Slovak was partially modeled on literary Czech, and Czech was preferred for some official functions in the Slovak half of the republic. Czech influence on Slovak was protested by Slovak scholars, and when Slovakia broke off from Czechoslovakia in 1938 as the Slovak State (which then aligned with Nazi Germany in World War II) literary Slovak was deliberately distanced from Czech. When the Axis powers lost the war and Czechoslovakia reformed, Slovak developed somewhat on its own (with Czech influence); during the Prague Spring of 1968, Slovak gained independence from (and equality with) Czech. Since then, "Czechoslovak" refers to improvised pidgins of the languages which have arisen from the decrease in mutual intelligibility.

What did 19th century German Bohemians call themselves?