TASK DEFINITION: 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.
PROBLEM: Passage: Canada's constitution, being a 'mixed' or hybrid constitution (a constitution that is partly formally codified and partly uncodified) originally did not make any reference whatsoever to a prime minister, with her or his specific duties and method of appointment instead dictated by "convention". In the Constitution Act, 1982, passing reference to a "Prime Minister of Canada" is added, though only regarding the composition of conferences of federal and provincial first ministers.

SOLUTION: What country has completly uncodified constitution?

PROBLEM: Passage: Northwestern fielded its first intercollegiate football team in 1882, later becoming a founding member of the Big Ten Conference. In the 1870s and 1880s, Northwestern affiliated itself with already existing schools of law, medicine, and dentistry in Chicago. The Northwestern University School of Law is the oldest law school in Chicago. As the university increased in wealth and distinction, and enrollments grew, these professional schools were integrated with the undergraduate college in Evanston; the result was a modern research university combining professional, graduate, and undergraduate programs, which gave equal weight to teaching and research. The Association of American Universities invited Northwestern to become a member in 1917.

SOLUTION:  What sports team did Northwestern field its first of in 1982?

PROBLEM: Passage: Tajikistan has a population of 7,349,145 (July 2009 est.) of which 70% are under the age of 30 and 35% are between the ages of 14 and 30. Tajiks who speak Tajik (a dialect of Persian) are the main ethnic group, although there are sizable minorities of Uzbeks and Russians, whose numbers are declining due to emigration. The Pamiris of Badakhshan, a small population of Yaghnobi people, and a sizeable minority of Ismailis are all considered to belong to the larger group of Tajiks. All citizens of Tajikistan are called Tajikistanis.

SOLUTION:
What was Tajikistan's population in July 2019?