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: To make pulp from wood, a chemical pulping process separates lignin from cellulose fibres. This is accomplished by dissolving lignin in a cooking liquor, so that it may be washed from the cellulose; this preserves the length of the cellulose fibres. Paper made from chemical pulps are also known as wood-free papers–not to be confused with tree-free paper; this is because they do not contain lignin, which deteriorates over time. The pulp can also be bleached to produce white paper, but this consumes 5% of the fibres; chemical pulping processes are not used to make paper made from cotton, which is already 90% cellulose.

SOLUTION: What is separated from pulp to make wood?

PROBLEM: Passage: An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by metallic bonding character. An alloy may be a solid solution of metal elements (a single phase) or a mixture of metallic phases (two or more solutions). Intermetallic compounds are alloys with a defined stoichiometry and crystal structure. Zintl phases are also sometimes considered alloys depending on bond types (see also: Van Arkel-Ketelaar triangle for information on classifying bonding in binary compounds).

SOLUTION: What is always a mixture of metal and other elements?

PROBLEM: Passage: During 2009, the federal government enacted new legislation repealing the Canada Corporations Act, Part II - the Canada Not-for-Profit Corporations Act. This Act was last amended on 10 October 2011 and the act was current till 4 March 2013. It allows for incorporation as of right, by Articles of Incorporation; does away with the ultra vires doctrine for nonprofits; establishes them as legal persons; and substantially updates the governance provisions for nonprofits. Ontario also overhauled its legislation, adopting the Ontario Not-for-Profit Corporations Act during 2010; pending the outcome of an anticipated election during October 2011,[dated info] the new Act is expected to be in effect as of 1 July 2013.

SOLUTION:
On October 10, 2011 what was repealed?