【Daily Question】November 17, 2015: Participation +2 Wealth； +3 to 8 wealth for correct answers
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This post was last edited by zjp on 2015-11-20 08:08. To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched; this aims to foster active technical exchanges while also providing financial rewards to users. 【Daily Question】 (Single-choice question) Which of the following standard solutions can only be prepared by calibration? ( ) A NaCl standard solution B HCl standard solution C K2Cr2O7 standard solution D Zn2+ standard solution. Correct answer: B. Post your answer in the replies; for participating in the quiz you will receive +2 points, and if you get all answers correct, you’ll get an additional +3 to +8 points. Those who provide thorough analyses and explanations for the questions or give detailed calculation processes will receive extra points as well. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions. Note: We will close this post after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation.
B HCl standard solution, because the salt and acid are volatile
The following standard solution can only be prepared by calibration (B, because it is volatile). A NaCl standard solution B HCl standard solution C K2Cr2O7 standard solution D Zn2+ standard solution
The standard solution that can only be prepared by calibration is (B). A NaCl standard solution B HCl standard solution C K2Cr2O7 standard solution D Zn2+ standard solution
The standard solution that can only be prepared by calibration is (B). A NaCl standard solution B HCl standard solution C K2Cr2O7 standard solution D Zn2+ standard solution
The standard solution that can only be prepared by calibration is (B)
The standard solution that can only be prepared by calibration is (D). A NaCl standard solution B HCl standard solution C K2Cr2O7 standard solution D Zn2+ standard solution
The standard solution that can only be prepared by calibration is (B) the HCl standard solution.
A, NACL-----------------------------------------