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This post was last edited by Oath-taking on 2011-9-8 07:00. 1. Please hide your replies; editing after posting is ineffective! Delete directly without hiding! 2. Hiding method: http://bbs.hcbbs.com/thread-492556-1-1.html 3. 5 points for correct answers; there is a reward for everyone who participates. Multiple-choice questions:1. 30% nicotinic acid is equivalent to concentrated sulfuric acid with a concentration of ( ). A 107% B 105% C 115% D 104%2. Which of the following is not an exothermic reaction? A The combustion of sulfur B The conversion of sulfur dioxide to sulfur trioxide C The absorption of sulfur trioxide D Sulfuric acid used to dry air. A D
Reply 1# A Shan c\c
Reply 1# A Shan AC
Reply 1# A Shan B B
Reply 1# A Shi A D
Reply 1# A Shi A,B
Reply 1# A Shan C C