TMA3 CHM391 PRACTICAL CHEMISTRY V- INORGANIC AND ANALYTICAL

1. ____ helps to remove impurity from a precipitate
2. Re-precipitation
3. Occlusion
4. Co-precipitation
5. Digestion

The answer is A. Re-precipitation

2. _____ is the second step involved in gravimetric analysis
3. Digestion
4. Precipitation
5. Washing
6. Filtration

The answer is B. Precipitation

3. Calculate the mineral acidity of 100ml of a water sample titrated with 0.2m of 0.80mg/l of NaOH
4. 4mg/l
5. 16mg/l
6. 20mg/l
7. 8mg/l

The answer is B. 16mg/l

4. Which of the following analytical techniques is used for the separation of the weight of element in a given sample?
5. Precipitation gravimetry
6. Atomic absorption spectroscopy
7. Qualitative and quantitative analysis of cation
8. Colorimetry

The answer is A. Precipitation gravimetry

5. All of the following are experimental preliminaries involved in determination of the concentration of elements by AAS, except___
6. Precipitation of standard solution of the element
7. Precipitation of sample solution
8. Sourcing of sample
9. Preparation of calibration curve

The answer is C. Sourcing of sample

6. Due to corrosive nature of _____ make it an important parameter to determine in water analysis
7. Hard water
8. Water containing nitrate
9. Acidified water
10. Water containing nitrate

The answer is C. Acidified water

7. ____ is used particularly for determining the concentration of metal ion in solution?
8. UV-Visible spectroscopy
9. Infrared spectroscopy
10. Colorimetry
11. Atomic absorption spectroscopy

The answer is D. Atomic absorption spectroscopy

8. It is important to determine and control alkalinity in water because _____?
9. It causes cancer
10. Alkaline water corrode pipes and boilers
11. It forms precipitate which foul pipes
12. It causes tooth decay

The answer is C. It forms precipitate which foul pipes

9. _____ is used for the precipitation of calibration graph in spectroscopic method of analysis
10. Standard solution of the compound being determined
11. Colourless solution of the compound being determined
12. Concentration solution of the compound being determined
13. Coloured solution of the compound being determined

The answer is A. Standard solution of the compound being determined

10. The reagent added to an analyte in solution which then forms an insoluble precipitation is known as _____?
11. Titrant
12. Supernatant
13. Titrant
14. Precipitant

The answer is D. Precipitant