1. The basic difference between the thermographs of TGA and DSC is In TGA change of heat is plotted against temperature while in DSC change of mass is plotted against temperature In TGA change of mass reltative to a reference is plotted against temperature while in DSC change of heat relative to a reference is plotted against temperature In TGA change of mass is plotted against temperature while in DSC change of heat is plotted against temperature Both TGA and DSC refer to the same analytical technique

2. A compound consisting of Cu(II), Ammonia and Chloride is subjected to TG analysis. A 335.91 mg sample of the compound had a weight loss of 28.20 mg. If all loss is ammonia, what is the formula of the sample?

[Cu(NH3)3Cl2]

[Cu(NH3)4]Cl2

[Cu(NH3)3](NH3)Cl2

[Cu(NH3)6]Cl2

3. How many water of crystallization does sodium bicarbonate have? 5 9 10 11

4. Which of the following methods can be used to determine the ash content in a polymer? DSC TGA DTA Polymers are always organic materials, hence has no ash content

5. How will you distinguish between calcium and oxalate using TGA? will give 2 weight loss changes while Magneisum oxalate will give 3 weight loss changes Calcium oxalate will give 3 weight loss changes while Magneisum oxalate will give 2 weight loss changes Both calcium and magnesium oxalate will give 2 weight loss changes Calcium oxallate is thermally stable while magnesium oxalate will give 3 weight loss changes 6. In a TGA experiment to determine the number of water of crystallization of copper sulfate, the temperature was raised upto 350 degree centigrade. The thermograph recorded three mass loss changes with a total loss of 35.58%. What is the water of crystallization? 3 4 5 6

7. If a mixture of calcium oxalate and magnesium oxalate is heated to 550 degree centigrade then which of the following correctly depicts the composition of the solid? Calcium carbonate and Calcium carbonate and Calcium oxide and magnesium oxide Calcium oxalate and magnesium oxide

8. Which of the following is best for getting a good resolution thermograph in TGA? High rate of heating Sample controlled rate of heating low rate of heating rate of heating is not related to resolution

9. In which of the following technique do you think atmospheric control is a more critical factor? DTA TGA UV-vis spectroscopy Mass spectroscopy

10. Hardness of water is due to Calcium and magnesium ions Calcium and manganese ions Sodium and magnesium ions Sodium and potassium ions