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NIOS Solved TMA Class 12: Chemistry 2023

Nios solved tma 2023 class 12 chemistry.

NIOS Chemistry TMA carry 20% of the theory marks that is 16. If you will submit your NIOS chemistry TMA online you will be able to get 16 marks for the NIOS assignment. Here are are providing you the solution of NIOS chemistry TMA. You can take the reference from the below solution then you can write your assignment.

If you will delay the process to submit your TMA online, You will be charged huge late fee. So, better to complete your NIOS assignment on time and submit online. 

NIOS Solved Assignment Chemistry Class 12th - 2022 - 2023

We will recommend you to refer to the below NIOS chemistry assignment solution while writing TMA. NIOS faculty provides good marks to those who complete their assignment in good hand writing. We will recommend students to write NIOS assignment in neat and clean way so that you will get full marks in it.

Chemistry (3) Tutor Marked Assignment

Max. marks: 20.

• All questions are compulsory. The marks allowed for each question are given at same place
• Write your name enrollment numbers, AI name, and subject on the top of the first page of the answer sheet.
• Answer any one out of the following questions in about 40-50 words.

(b) Provide the formula for one compound that is positively charged and one that is negatively charged that is isoelectronic with \(Ne\). \( Ans:\) The formula of one species positively charged and negatively charged which is isoelectronic with Ne are respectively Na⁺ (Sodium-ion) and F⁻ (Floride ion). The term Isoelectronic means the ions have identical electrons in the same ground state configurations. Here, Neon (Ne) has a ground state configuration of \(1s^{2} 2s^{2} 2p^{6}\) and has 2,8 electrons. On the other hand, Na has a configuration of\( [Ne]3s^1\) So if Sodium loses one electron of 3s orbital it becomes sodium ion (Na⁺) which also has 6 electrons in 2p orbital which makes Na⁺ isoelectronic with Neon. As we know F has a configuration of \(1s^{2} 2s^{2} 2p^{5}\) and when F gains one electron it becomes Floride ion (F⁻) which again has identical numbers of Ne. Hence, Na⁺ is the positively charged and F⁻ is the negatively charged ion which are isoelectronic with Neon.

(b) Classify each of the following semiconductors as p-type or n-type: (i) Ge mixed/doped with In. (ii) B mixed/doped with Si.

\( Ans:\) When Germanium is doped with Indium, P-type semiconductor is formed. p-type semiconductor: It contains large number of positive charges i.e. holes, known as majority charges. Hence it is called P-type semiconductor (P for positive-holes). • Ge is group 14 element and In is group 13 element. Hence an electron deficient hole is created and therefore, it is p-type. • B is group 13 elements and Si is group 14 elements, there will be a free electron. Hence, it is n-type n-type semiconductor: An extrinsic semiconductor which has been doped with electron donor atoms is called an n-type semiconductor, because the majority of charge carriers in the crystal are negative electrons.

(b) Pure liquids and solids can be ignored while writing the value of equilibrium constant, Explain. \( Ans:\)• Pure solids and liquids are not written in the equilibrium constant expression. This is because they do not affect the concentration of reactant at equilibrium in the reaction. • For pure solid or pure liquid- \( M=\frac{n}{V} =\frac{m}{MV} =\frac{d}{M}\). • Here d is the density and M is the molecular mass. • Now the density and molecular mass of a pure substance is always constant and is included in the equilibrium constant. • So the pure solids and pure solids can be ignored while writing the equilibrium constant expression. As the density and molecular mass of a pure substance is always constant and is included in the equilibrium constant. So the pure solids and pure solids can be ignored while writing the equilibrium constant expression.

• Answer any one out of the following questions in about 100-150 words.

(b) Carbon monoxide gas is more dangerous than carbon dioxide gas. Explain the reason. \( Ans:\) Human blood has hemoglobin responsible for transporting oxygen to all cells and taking back \(CO_2\) from them to the lungs. The haeme group thus forms reversible bonds with oxygen and carbon dioxide. Carbon monoxide forms a stronger bond than carbon dioxide with haeme’s iron; if it happens, that is if carbon monoxide bonds with haeme, oxygen can not bond as carbon monoxide bond is stronger. Thus, the supply of oxygen decreases in the body and may lead to individual death. Both are deadly, in sufficient quantities, they can each kill you. Carbon monoxide kills at much lower concentrations because it readily and preferentially displaces oxygen at red blood sites basically depriving your brain of oxygen even when there’s plenty of oxygen around. Lethal concentrations are around 200 ppm and up. That's 0.02%. Carbon dioxide will kill you when its concentration is the air is so high there is little oxygen left. Oxygen is normally ~20% of air or 200,000 ppm. Carbon dioxide lethal levels are around 150,000–250,000 ppm or 15–25% of air. That’s 1000 times higher than carbon monoxide lethal levels. Both monoxide and dioxide are deadly in closed spaces with poor ventilation. Carbon Dioxide particularly accumulates in somewhat sealed spaces because being denser than normal air accumulates in low places so you literally drown in an invisible gas.

\( Ans:\) Froth flotation process: i) The froth flotation process is based on the principle of difference in the wetting properties of the ore and gangue particles with water and oil. ii) It is used for the extraction of those metals in which the ore particles are preferentially wetted by oil and gangue particles by water. iii) This method has been used for removing gangue from sulphide ores. eg. Galena (PbS), zinc blende (ZnS), copper pyrites \((CuFeS_2)\), etc. iv) In this method, a suspension of the powdered ore is made with water. To this suspension small quantities of collectors and froth stabilizers are added. Collectors (eg. pine oil, eucalyptus oil, fatty acids, xanthates, etc.) enhance non-wettability of the mineral particles and froth stabilizers (eg. cresols, aniline) help in stabilization of the froth. v) In the flotation tank, a current of compressed air is circulated through the water. A rotating paddle agitates the mixture and draws air into it. As a result, froth is formed which carries the mineral particles. The froth is light and is skimmed off. It is then dried for recovery of the ore particles. The gangue material is wetted by water and settles at the bottom. vi) Sometimes, it is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants'. ego In case of an ore containing ZnS and PbS, the depressant used is NaCN. It selectively prevents ZnS from coming to the froth but allows PbS to come with the froth, which can be further removed off.

• Prepare any one of the project out of two given below.

a) 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. (i) Explain the main reasons of air pollution. (ii) Identify primary and secondary pollutants. (iii) Name two water borne diseases. (iv) Illustrate the global warming. (v) It is advisable to switch off engine of vehicle at red light, explain with reason. (vi) Define photochemical smog. \( Ans:\) (i) Explain the main reasons of air pollution. The main cause of air pollution is the burning of fossil fuels. Harmful gases like sulphur dioxide, carbon monoxide etc. are released into the atmosphere due to incomplete combustion of fossil fuels which pollutes the air. (ii) Identify primary and secondary pollutants. Primary pollutants are those that are emitted directly from a source, which can be natural (volcanic eruptions or fires, for example) or of anthropogenic origin (carbon monoxide from vehicles). Secondary pollutants, on the other hand, are not emitted directly. Its origin lies in the interactions between the primary emissions in the atmosphere. One of the most known secondary pollutants is tropospheric ozone. (iii) Name two water borne diseases. Waterborne diseases are illnesses caused by microscopic organisms, like viruses and bacteria, that are ingested through contaminated water or by coming in contact with feces. 1. Diarrhea 2. Cholera (iv) Illustrate the global warming. Global warming is a gradual, long-term increase in the average temperature of Earth's atmosphere due to the greenhouse effect where gasses from various human activities, including the burning of fossil fuels, trap heat from solar radiation. (v) It is advisable to switch off engine of vehicle at red light, explain with reason. Switching off the engine of the vehicles at the red light on the road will help to save fuel and cause less pollution. (vi) Define photochemical smog. Photochemical smog is a type of air pollution due to the reaction of solar radiation with airborne pollutant mixtures of nitrogen oxides and volatile organic compounds (hydrocarbons). Smog is a byproduct of modern industrialization. Due to industry and the number of motor vehicles, this is more of a problem in large cities that have a warm, sunny and dry climate.

How to upload NIOS Chemistry TMA online?

Many of the students upload their TMA under the other subject name. So, to upload chemistry TMA online you have to choose your subject first and then you can select the medium in which you have written your chemistry assignment. If you will be not able to upload at the right place then it will effect your marks. Also, make sure to write the name details on your assignment.

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NIOS CLASS 12TH Chemistry (313) SOLVED TMA In English Medium PDF SESSION 2023-24

Which is Applicable for March/April & October/November 2024 Examination.

This platform provides Nios Chemistry (313) TMA Solved with project work for class 12th. Here you can Get Nios Solved Tutor Mark Assignment (TMA) in Good Quality which helps to achieve More and More Marks. Nios Assignment’s Answer Prepared by well Skilled and Experienced Teachers.

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➛ Total six questions are given by Nios in TMA. All questions have 2 options out of which one has to be selected. In this PDF, we have given you the answer of one option which is better so that your marks will be good.

➛ You have to write the question and answer on the A4 size sheet as given in this PDF.

➛ After writing, the page has to be scanned and made a PDF and upload on the portal of NIOS.

TMA Questions

Q1. Answer any one out of the following questions in about 40-50 words.

(i) 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.

(ii) Electron gain enthalpy of chlorine has more negative value as compared to that of fluorine (F), explain the reason.

Q2. Answer any one out of the following questions in about 40-50 words.

(i) How do metallic and ionic substances differ in conducting electricity? (ii) What is a unit cell? How many atoms are there in a FCC unit cell?

Q3. Answer any one out of the following questions in about 40-50 words.

(i) 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.

(ii) Name two factors which favor a spontaneous reaction.

Q4. Answer any one out of the following questions in about 100 -150 words.

(i) Define water pollution; list any three anthropogenic sources of water/pollution

(ii) A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased. (1) What is the initial effect of the change on vapour pressure? (ii) How do rates of evaporation and condensation change initially?

Q5. Answer any one out of the following questions in about 100-150 words.

(i)Write the name of any one metal which can be refined by distillation method.

(ii) Describe the electrolytic refining method with labeled diagram of copper metal. Write the name of metal which is settled as anode mud. 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

Q6. Prepare any one of the projects out of two given below.

(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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Free NIOS TMA Chemistry 313 Solved Assignment 12th (English Medium) Pdf

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Free NIOS TMA Chemistry 313 Solved Assignment 12th (English Medium) Pdf Format. Previous Year (2019-2020) National Institute of Open Schooling (NIOS) Tutor Marked Assignment Solution Sample File.

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Online Free NIOS TMA Chemistry 313 Solved Assignment Sr. Secondary Class. Nios Solved Assignment (TMA) with Project Work (Question 6) E-Copy. File download link will appear instantly.

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Online Chemistry-(313) Nios Solved Assignment Medium-English 2024, 12

Tutor Marked Assignment Answer (TMA) 2020-21 Growth Education Points Offering Online Nios solved Assignment For 10th Class &12th Class. Nos solved assignment for April/Oct. examination 2021 (Latest Nios solved assignment 2020-21 Session).You can Download assignment These assignments are for English Medium/ Hindi Medium Students. Do not facing you any type problem doing copy from my assignment because my All assignments is computerized typed.

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Growth Education Points Offering Online Nios solved Assignment For 10th Class &12th Class. Nos solved assignment for April/Oct. examination 2021 (Latest Nios solved assignment 2020-21 Session).You can Download assignment

These assignments are for English Medium/ Hindi Medium Students. Do not facing you any type problem doing copy from my assignment because my All assignments is computerized typed.

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