TMA Questions

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Q1. Answer any one out of the following questions in about 40-50 words.
(i) The element in question is present in the third period of the p-block. It has 5 electrons in its outermost shell. Predict its group. How many unpaired electrons does it have. State the number of unpaired electrons.
(ii) Provide the formula for one compound that is positively charged and one that is negatively charged that is isoelectronic with Ne.

Q2. Answer any one out of the following questions in about 40-50 words.
(i) Arrange the following lattices in the order of highest packing efficiency
• Simple cubic
• Body-centered cubic and
• Hexagonal close-packed
(ii) Classify each of the following semiconductors as p-type or n-type:
• Ge mixed/doped with In.
• B mixed/doped with Si.

Q3. Answer any one out of the following questions in about 40-50 words.
(i) If the following reaction is in equilibrium, define the value of Kc.

(ii) Pure liquids and solids can be ignored while writing the value of equilibrium constant, Explain.

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Q4. Answer any one out of the following questions in about 100 -150 words.
(i) Describe tropospheric pollution in your own words.
(ii)Carbon monoxide gas is more dangerous than carbon dioxide gas. Explain the reason.

Q5. Answer any one out of the following questions in about 100-150 words.
(i) Froth flotation is used for the concentration of sulphide ores because it is a highly effective method. Explain.
(ii) Describe the underlying principle of each of the following metal refining methods:
• Electrolytic refining of metals.
• Vapour phase refining of metals.
(iii) Identify the role of each of the following:
• NaCN in the extraction of silver from a silver ore.
• Cryolite in the extraction of aluminium from pure alumina.

Q6. Prepare any one of the projects out of two given below.
(i) The students from Class XII visited a nearby village as part of a group excursion. Rural and urban environments differ significantly from one another. In urban area, there is a lot of pollution. Peoples are suffering from cough, typhoid, and dengue diseases but in rural area people are healthy. There are a large number of trees in rural area therefore. Environment is clean.
• Explain the main reasons of air pollution.
• Identify primary and secondary pollutants.
• Name two water borne diseases.
• Illustrate the global warming.
• It is advisable to switch off engine of vehicle at red light, explain with reason.
(ii) Define photochemical smog.
Principal of a reputed school, observed the growing cases of diabetes and depression among young children, organized a seminar in which he invited parents and principals. All of them resolved this issue by banning junk food in schools, and introducing healthy snacks and drinks, such as soup, lassi, and milk in the school canteens. As part of the morning assembly, the students will be required to participate in half an hour of physical activity. Six months later, Principal conducted a health survey in most of the schools, and discovered that the health of the students had greatly improved.
After reading the above passage, answer the following questions: –
• Describe two values exhibited by Principal.
• As a student, how can you raise awareness of this issue?
• Explains anti-depressant drugs with the help of an example.
• Name the sweetening agent used in the preparation of sweets for a diabetic patients.

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