1, the following substances react, both white precipitate, and blue precipitate is produced ( )
A. CuSO4 solution and Ba (OH) 2 solution B. CuSO4 solution and BaCl2 solution
C. CuCl2 solution and AgNO3 solution D. CuCl2 solution and KOH solution
2, barium chloride, silver nitrate, sodium carbonate three colorless solutions, the best use of a reagent is ( )
2, the best use of a reagent is to identify barium chloride, silver nitrate, sodium carbonate three colorless solutions, the best use of a reagent is to identify barium chloride and silver nitrate, sodium carbonate three colorless solutions. >2, identification of barium chloride, silver nitrate, sodium carbonate three colorless solutions, the best use of a reagent is ( )
A, hydrochloric acid B, sulfuric acid C, sodium hydroxide solution D, sodium chloride solution
3, the difference between dilute hydrochloric acid and dilute sulfuric acid should be used ( )
A, purple litmus B, colorless phenolphthalein C, PH test paper D, barium chloride solution
4, Both insoluble in water, and insoluble in hydrochloric acid, but can react with silver nitrate solution is ( )
A, NaCl B, CuO C, Cu D, Zn
8, with a reagent can be identified Na2SO4, Ca (OH) 2, dilute hydrochloric acid three kinds of solutions, this reagent is
A. Phenolphthalein test solution B. Copper chloride solution? C. Silver nitrate solution? D. Sodium carbonate solution
5, the following reagents, can not identify sodium chloride solution and sodium carbonate solution is
A. Potassium sulfate solution B. Barium hydroxide solution C. Calcium nitrate solution D. Dilute sulfuric acid
In addition to impurity questions
1, the following groups of substances in the impurity (impurity in parentheses), only need to add the appropriate amount of dilute sulfuric acid can be removed ( )
A. Nitrate, Nitrate and Sodium Carbonate solution. p>
A. NaCl (Na2CO3) B. Fe (Cu) C. Na2CO3 (CaCO3) D. HCl (BaCl2)
2, to remove a small amount of magnesium sulfate mixed with table salt solution, can be added to an appropriate amount of a reagent is ( )
A. BaCl2 solution B. NaOH solution C. Na2O D. BaO
3, the following in addition to impurities (impurities in parentheses) selected reagents are reasonable ( )
A. Cu (Zn) dilute hydrochloric acid B. CO2 gas (HCl) sodium hydroxide solution
C. CuO (Cu) dilute sulfuric acid D. Na2SO4 solution (Na2CO3) barium chloride solution
4, the following items in parentheses is the substance used to remove the impurities. Impurities used in the following items in parentheses is the removal of drugs, the error is ( )
A. NaOH mixed with Na2CO3 (hydrochloric acid) B. CO2 mixed with CO2 (lime water) C. H2 mixed with HCl (NaOH solution) D. KNO3 mixed with KCl (AgNO3 solution)
5, to remove the small amount of hydrochloric acid mixed with nitric acid, can be added to the reagent is ( )
5. p> A. BaCl2 solution? B. NaOH solution C. solution D. solution