2008/2009 UNN Chemistry Post-UTME
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How many molecules are there in 14g of nitrogen gas at S.T.P? (N= 14, Avogadro number= 6.0 x 1023)CorrectIncorrect
120cm3 of hydrogen were sparked with 60cm3 of oxygen at 1100. What was the volume of steam produced? The equation for the reaction is 2H2O(g) + o2(g) 2H2O(g)CorrectIncorrect
In the purification of town water supply, alum is used principally toCorrectIncorrect
The solubility of Na3AsO4(H2O)12 is 38.9g per 100g H2O.
What is the mass percentage of Na3AsO4 in the ethanol? (As = 75, Na = 23, O = 16, H = 1)CorrectIncorrect
35cm3 of hydrogen was sparked with 12cm of oxygen at 1100C and 760mm Hg to produce. What percentage of the total volume of gas left after the reaction is hydrogen?CorrectIncorrect
In the extraction of iron in the blast furnace, limestone is used toCorrectIncorrect
10.0 dm3 of air containing H2S as an impurity was passed through a solution of Pb(NO3)2 until all the H2S had reacted. The precipitate of PbS was found to weigh 5.02 g. According to the equation:
Pb(NO3)2 + H2S → PbS + 2HNO3 the percentage by volume of hydrogen sulphide in the air is?
(Pb= 207, S=32 GMV at S.T.P. = 22.4dm3)CorrectIncorrect
The Avogadro number at 24g of magnesium is the same as that ofCorrectIncorrect
Helium atoms are chemically uncreative becauseCorrectIncorrect
How many grams of Hbr would exactly be required to react with 2g of propyne? (C=12, H=1, Br=80)CorrectIncorrect