[Soda Ash Knowledge] Daily Question (47) 11/19/2009
Thread Content
Please hide the reply; no scoring will be given in principle if it is not hidden. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Posts that have been edited are not rated. (The topic for this issue is taken from page 72 of \"Technical Worker Training Question Bank – Soda Ash Production Operators.\" An electronic version of this book is available for download in the soda ash information sharing area: http://bbs.hcbbs.com/thread-13140-1-2.html) Multiple-choice questions: 1. Which of the following devices are commonly used in the laboratories of soda ash plants? ( ) A. Vacuum pump B. Electric oven C. High-temperature furnace D. Vibration sieve 2. In what forms does FNH3 usually exist in the mother liquor? （ ） A、(NH4)2CO3 B、NH4CL C、NH4HCO3 D、NH4OH 3. The methods to eliminate systematic errors are （ ）。 A. Control experiment B. Improving the operator’s skills C. Blank experiment D. Calibrating the instrument 4. Methyl orange is commonly used as an indicator in the analysis of soda ash production; its color change range is ( ). A. PH=3.1—4.4 B. PH=4.4—6.2 C. PH=4.5—6.5 D. PH=5.0—8.0 5. The method of using 0.1mol/L H2SO4 to determine TNH3 in the cooling water of a carbonation tower belongs to ( ). A. Strong acid titrating strong base B. Strong acid titrating weak base C. Weak acid titrating strong base D. Weak acid titrating weak base
DCD\C\ABD\C\B
1.ABCD 2.ACD 3.ACD 4.A 5.B
ABCD ACD ACD A B
1# chen3jun 1、ABCD 2、ACD 3、ACD 4、A 5、B
1.ABCD 2.ACD 3.ACD 4.A 5.B
1. ABCD 2. ACD 3. ACD 4. A 5. B
This post was last edited by lxq700918 on 2009-11-19 09:01. 1. Which of the following devices are commonly used in the laboratories of alkali plants? (ABCD) A. Vacuum pump B. Electric oven C. High-temperature furnace D. Vibration sieve 2. In what forms does FNH3 usually exist in the mother liquor? (ABCD) A. (NH4)2CO3 B. NH4Cl C. NH4HCO3 D. NH4OH 3. The ways to eliminate systematic errors are (BD). A. Control experiment B. Improving the operator’s skills C. Blank experiment D. Calibrating the instrument 4. Methyl orange is commonly used as an indicator in the analysis of soda ash production, and its color change range is (A). A. PH=3.1—4.4 B. PH=4.4—6.2 C. PH=4.5—6.5 D. PH=5.0—8.0 5. The method of using 0.1mol/L H2SO4 to determine TNH3 in the cooling water of a carbonation tower belongs to (B). A. Strong acid titrating strong base B. Strong acid titrating weak base C. Weak acid titrating strong base D. Weak acid titrating weak base 1# chen3jun
1.BCC;2.AD;3.ABD;4.C;5.B