Multiple choice ( Only one “best answer ”should be selected/circled ). (1) Which of the following was used as an indicator for the lab “The soluble chloride determination by gravimetry” ? ____ a. Silver nitrate b. silver chloride c. EBT d. hydrochloric acid e. none of the above
3 . Multiple choice ( Only one “best answer ”should be selected/circled ).
(1) Which of the following was used as an indicator for the lab “The soluble chloride determination by gravimetry” ?
____ a. Silver nitrate b. silver chloride c. EBT d. hydrochloric acid e. none of the above
(2). Which of the following chemicals reacts with starch to form a deep navy blue complex ?
____ a. HCl(aq) b. iodide c. thiosulfate d. iodine e. copper ion f. dichromate g. thiocyanide
(3). KHP can not be used as
___ a. electrolyte b. acid c. indicator d. base e. titrant f. primary standard
(4). A buret in the “The soluble chloride determination by gravimetry” lab is employed as
____ a. a titrating tool b. storage of indicator c. a delivering tool d. none of the above
(5). In our iodometry lab, the primary standard is
____ a. I2 b. Na2S2O3 c. Na2S4O6 d. Na2CO3 e. KI f. Cu2+ g. K2Cr2O7 h. KSCN
(7). KHP is a
____ a. acid b. base c. amphoteric substance d. neutral salt e. solvent
(8). Na2EDTA is actually used in the lab because
____ a. it does not lose its crystalline water component.
- it loses its crystalline water component thus makes a constant composition.
- it is a base which is needed to react with metal ions.
- it is easier to be dissolved in water than EDTA.
- it is only commercially available EDTA-related reagent.
(9). Which of the following statement is true ?
____ a. EDTA is an amino acid.
- Usually we use the acidic form of EDTA for the lab use.
- EDTA stands for “ Ethyldimertetraacid”
- EDTA forms complexes with metal ions in a variable stoichiometry.
- EDTA usually offers 5 binding sites for metal ions.
- None of the above
(10). “The determination of CuO ore sample” lab is a
____ a.
Step by step
Solved in 2 steps
