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: The great angiosperm radiation, when a great diversity of angiosperms appears in the fossil record, occurred in the mid-Cretaceous (approximately 100 million years ago). However, a study in 2007 estimated that the division of the five most recent (the genus Ceratophyllum, the family Chloranthaceae, the eudicots, the magnoliids, and the monocots) of the eight main groups occurred around 140 million years ago. By the late Cretaceous, angiosperms appear to have dominated environments formerly occupied by ferns and cycadophytes, but large canopy-forming trees replaced conifers as the dominant trees only close to the end of the Cretaceous 66 million years ago or even later, at the beginning of the Tertiary. The radiation of herbaceous angiosperms occurred much later. Yet, many fossil plants recognizable as belonging to modern families (including beech, oak, maple, and magnolia) had already appeared by the late Cretaceous.

SOLUTION: When does a diversity of magnoliids appear in the fossil record?

PROBLEM: Passage: In the context of relativity, mass is not an additive quantity, in the sense that one can add the rest masses of particles in a system to get the total rest mass of the system. Thus, in relativity usually a more general view is that it is not the sum of rest masses, but the energy–momentum tensor that quantifies the amount of matter. This tensor gives the rest mass for the entire system. "Matter" therefore is sometimes considered as anything that contributes to the energy–momentum of a system, that is, anything that is not purely gravity. This view is commonly held in fields that deal with general relativity such as cosmology. In this view, light and other massless particles and fields are part of matter.

SOLUTION: What type of quantity is mass?

PROBLEM: Passage: The Flushing Remonstrance shows support for separation of church and state as early as the mid-17th century, stating their opposition to religious persecution of any sort: "The law of love, peace and liberty in the states extending to Jews, Turks and Egyptians, as they are considered sons of Adam, which is the glory of the outward state of Holland, so love, peace and liberty, extending to all in Christ Jesus, condemns hatred, war and bondage." The document was signed December 27, 1657 by a group of English citizens in America who were affronted by persecution of Quakers and the religious policies of the Governor of New Netherland, Peter Stuyvesant. Stuyvesant had formally banned all religions other than the Dutch Reformed Church from being practiced in the colony, in accordance with the laws of the Dutch Republic. The signers indicated their "desire therefore in this case not to judge lest we be judged, neither to condemn least we be condemned, but rather let every man stand or fall to his own Master." Stuyvesant fined the petitioners and threw them in prison until they recanted. However, John Bowne allowed the Quakers to meet in his home. Bowne was arrested, jailed, and sent to the Netherlands for trial; the Dutch court exonerated Bowne.

SOLUTION:
What shows support for the separation of church and state as late as the mid-17th century?