Problem: To avoid the implication of the naked "solvated proton" in solution, acidic aqueous solutions are sometimes considered to contain a less unlikely fictitious species, termed the "hydronium ion" (H
3O+). However, even in this case, such solvated hydrogen cations are more realistically conceived as being organized into clusters that form species closer to H
9O+
4. Other oxonium ions are found when water is in acidic solution with other solvents.
Where can oxonium ions be found?
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Answer: in acidic solution with other solvents

Problem: It is estimated that in 480 BC, 50 million people lived in the Achaemenid Empire. The empire at its peak ruled over 44% of the world's population, the highest such figure for any empire in history. In Greek history, the Achaemenid Empire is considered as the antagonist of the Greek city states, for the emancipation of slaves including the Jewish exiles in Babylon, building infrastructures such as road and postal systems, and the use of an official language, the Imperial Aramaic, throughout its territories. The empire had a centralized, bureaucratic administration under the emperor, a large professional army, and civil services, inspiring similar developments in later empires. Furthermore, one of the Seven Wonders of the Ancient World, the Mausoleum at Halicarnassus, was built in the empire between 353 and 350 BC.
How many people lived in the Archaemenid Empire in 480BC?
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Answer: 50 million people

Problem: Punjab has the largest economy in Pakistan, contributing most to the national GDP. The province's economy has quadrupled since 1972. Its share of Pakistan's GDP was 54.7% in 2000 and 59% as of 2010. It is especially dominant in the service and agriculture sectors of Pakistan's economy. With its contribution ranging from 52.1% to 64.5% in the Service Sector and 56.1% to 61.5% in the agriculture sector. It is also major manpower contributor because it has largest pool of professionals and highly skilled (technically trained) manpower in Pakistan. It is also dominant in the manufacturing sector, though the dominance is not as huge, with historical contributions raging from a low of 44% to a high of 52.6%. In 2007, Punjab achieved a growth rate of 7.8% and during the period 200203 to 200708, its economy grew at a rate of between 7% to 8% per year. and during 200809 grew at 6% against the total GDP growth of Pakistan at 4%.
What manpower does Punjab provide?
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Answer:
largest pool of professionals and highly skilled (technically trained) manpower in Pakistan