[Soda Ash Knowledge] One Question per Day (48) 11/20/2009
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Please hide the replies; no scoring will be given in principle if they are 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 question 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 question: 6. In the comprehensive analysis of heavy alkalis, which parameters can be analyzed using calculation methods? ( ) A. Na2CO3 B. NaCl C. NH4HCO3 D. Water E. Burning rate. 7. When using EDTA to determine the concentrations of Ca2+ and Mg2+ in the mother liquor, ( ) method is often employed to eliminate interference. A. Add Eriochrome Black T B. Add calcium indicator C. Control the acidity of the solution D. Add a masking agent 8. Methyl orange is a ( ). A. Organic weak acid B. Organic weak base C. Inorganic weak acid D. Inorganic weak base 9. When titrating 20 ml of 0.1mol/L ammonia solution with 0.1mol/L HCl, the appropriate indicator is ( ). A. Indicator that changes color in neutral regions B. Indicator that changes color in acidic regions C. Indicator that changes color in alkaline regions 10. To analyze TCL- in ammonia mother liquor, ( ) should be used. A. Neutralization method B. Calculation method C. Mohr method D. EDTA method
6. In the total analysis of heavy alkalis, which parameters can be analyzed using computational methods? (CD) A. Na2CO3 B. NaCl C. NH4HCO3 D. Moisture E. Burning rate. 7. When using EDTA to determine the concentrations of Ca2+ and Mg2+ in the mother liquor, the (CD) method is often employed to eliminate interference. A. Add Eriochrome Black T B. Add calcium indicator C. Control the acidity of the solution D. Add a masking agent 8. Methyl orange is a (B). A. Organic weak acid B. Organic weak base C. Inorganic weak acid D. Inorganic weak base 9. When titrating 20 ml of 0.1mol/L ammonia solution with 0.1mol/L HCl, the appropriate indicator is (B). A. Indicator that changes color in neutral regions B. Indicator that changes color in acidic regions C. Indicator that changes color in alkaline regions 10. To analyze TCL- in ammonia mother liquor, (C) should be used. A. Neutralization method B. Calculation method C. Mohr method D. EDTA method
6.CD 7.CD 8.B 9.B 10.C
6.DC 7.CD 8.B 9.B 10.C
6. CD 7. CD 8. B 9. B 10. C
1# chen3jun 6, CD 7, CD 8, B 9, B 10, C
6. In the total analysis of heavy alkalis, which parameters can be analyzed using computational methods? (CD) A. Na2CO3 B. NaCl C. NH4HCO3 D. Moisture E. Burning rate. 7. When using EDTA to determine the contents of Ca2+ and Mg2+ in the mother liquor, the (CD) method is often employed to eliminate interference. A. Add Eriochrome Black T B. Add calcium indicator C. Control the acidity of the solution D. Add a masking agent 8. Methyl orange is a (B). A. Organic weak acid B. Organic weak base C. Inorganic weak acid D. Inorganic weak base 9. When titrating 20 ml of 0.1mol/L ammonia solution with 0.1mol/L HCl, the suitable indicator is (B). A. Indicator that changes color in neutral regions B. Indicator that changes color in acidic regions C. Indicator that changes color in alkaline regions 10. To analyze TCL- in ammonia mother liquor, (C) should be used. A. Neutralization method B. Calculation method C. Mohr method D. EDTA method 1# chen3jun
6. In the total analysis of heavy alkalis, which parameters can be analyzed using computational methods? (CD) A. Na2CO3 B. NaCl C. NH4HCO3 D. Moisture E. Burning rate. 7. When using EDTA to determine the contents of Ca2+ and Mg2+ in the mother liquor, the (CD) method is often employed to eliminate interference. A. Add Eriochrome Black T B. Add calcium indicator C. Control the acidity of the solution D. Add a masking agent 8. Methyl orange is a (B). A. Organic weak acid B. Organic weak base C. Inorganic weak acid D. Inorganic weak base 9. When titrating 20 ml of 0.1mol/L ammonia solution with 0.1mol/L HCl, the suitable indicator is (B). A. Indicator that changes color in neutral regions B. Indicator that changes color in acidic regions C. Indicator that changes color in alkaline regions 10. To analyze TCL- in ammonia mother liquor, (C) should be used. A. Neutralization method B. Calculation method C. Mohr method D. EDTA method
6DC7CD8B9B10C
1. ACE2, AC3, A4, B5, B