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NIOS CHEMISTRY (313) Solved Assignments [TMA] 2023-24
NIOS SOLVED ASSIGNMENTS [TMA] 2023-24
SENIOR SECONDARY SOLVED [TMA] 2023-24
CHEMISTRY (313)
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Max. Marks: 20
Note:
(i)All questions are compulsory. The marks allotted for each question are given at same place.
(ii) Write your name, enrollment number, Al name and subject on the top of the first page of the answer sheet.
1. Answer any one out of the following questions in about 40 to 60 words.
(a) Identify the group and valency of the element having atomic number 119. Also, predict the outermost electronic configuration and write the general formula of its oxide. (See Lesson-3)
Ans - Element 119 belongs to the alkali metal group, with a valency of +1. Its outermost electronic configuration would likely be [Xe] 7s^1. The general formula of its oxide would be X2O.
(b) Electron gain enthalpy of chlorine has more negative value as compared to that of fluorine (F), explain the reason. (See Lesson-3)
Ans - Answer Anyone
2. Answer any one out of the following questions in about 40 to 60 words.
(a) How do metallic and ionic substances differ in conducting electricity? (See Lesson-3)
Ans - Metallic substances conduct electricity due to the presence of delocalized electrons that can move freely within the lattice. In contrast, ionic substances conduct electricity when their ions are mobile, typically in molten or aqueous forms, allowing for the flow of charged particles.
(b) What is a unit cell? How many atoms are there in a FCC unit cell? (See Lesson-6)
Ans - Answer Anyone
3. Answer any one out of the following questions in about 40 to 60 words.
(a) The enthalpy change for the transition of liquid water to steam at temperature 373K is 40.8 UJ mol-1. Calculate the entropy change for the process. (See Lesson-10)
(b) Name two factors which favor a spontaneous reaction. (See Lesson-10)
4. Answer any one out of the following questions in about 100 to 150 words.
(a) Define water pollution; list any three anthropogenic sources of water/pollution (See Lesson-32)
(b) A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased.
(i) What is the initial effect of the change on vapour pressure?
(ii) How do rates of evaporation and condensation change initially? (See Lesson-11)
5. Answer any one out of the following questions in about 100 to 150 words.
(a) Write the name of any one metal which can be refined by distillation method. (See Lesson-16)
(b) Describe the electrolytic refining method with labeled diagram of copper metal. Write the name of metal which is settled as anode mud. (See Lesson-16)
OR
Why are chromium oxide (Cr2O3) and manganese oxide (Mn3O4) reduced by aluminium metal power instead of carbon? Write the name of that process and chemical equations related to reduction of above metal oxides. (See Lesson-16)
6. Prepare any one of the project out of two given below in about 500 words.
(a) You have visited a hospital of you town. You have found that some people were suffering from higher, and some have minor injuries, while you are also patient of hyper acidity and cold. Doctors prescribed different medicines to all the patients.
(i) What are the names of antipyretic drugs? (One drug)
(ii) Write the name of an antiseptic medicine.
(iii) Names of two antacids?
(iv) Write the name of one antihistamine.
(v) Quinine is the very common medicine of which type of fever?
(vi) What type of damage to body is possible if you are using phenol more than 1% concentrate?
(b) Visit the nearby treatment process of Sewage and collect the following knowledge/ information.
(i) How many stages are there of treatment of waste water?
(ii) What is coagulation?
(iii) What is substance?
(iv) What is softening?
(v) Which is used as disinfectant to kill bacteria?
(vi) How chlorine produces toxic and potentially active carcinogens?
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