MEV 013 Solved Assignment 2021-22

MEV 013 Solved Assignment 2021-22: MEV 013 Solved Assignment 2021-22 MEV 013 Assignment 2021-22 All IGNOU Assignment available at our website. IGNOU University always being in picture due to its IGNOU Assignment Date Extended. In this post Student will Get MEV 013 ENVIRONMENTAL CHEMISTRY Solved Assignment 2021-22

Course Code : MEV-013

Course Title : Environmental Chemistry

Assignment Code : MEV-013/TMA-01/January & July session 2021

Note: This assignment is based on the entire course. Answer any five questions. All question carries equal marks. Please write all answers in your own words.

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1. Explain modern methods of separation and electrical methods of analysis with suitable examples?

Separation techniques are the methods used to remove one substance from a mixture containing any number of other substances, for harvesting or identification.

In the production of chemical substances, especially pharmaceuticals, it is important to ensure that the products are pure and uncontaminated. If we want a particular reaction to occur we need to be sure that only the required reactants are present, otherwise unforeseen products may be formed and may change the properties of the substance we are trying to make. The un-purified raw materials are processed to the required purity so that they can be used as feedstock in a variety of pharmaceutical processes.

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In almost all chemical reactions there will be more than one substance formed. The substance we want to produce is called the product and any other substances formed are called co-products or by-products. These co-products and any unreacted substances must be removed before the product can be used for commercial purposes, for both safety and quality reasons. The degree of purity required varies depending on the use. If the substance is used in food or in medicines, then purity is of the highest importance.

There are numerous ways to purify substances and the methods used depend on the physical and chemical properties of the substances involved. In most cases more than one method is needed to achieve the desired product purity. When a substance is separated, purified and collected for use, it is said to be harvested.

The phrase ‘like oil and water’ refers to things that do not mix, just like, well – oil and water, whose chemical properties prevent their mixing. But in many cases, what we really need are ways to achieve the opposite – separate mixed substances.

Crude oil is a good example: It is a mixture of numerous carbohydrates (compounds that consist of hydrogen and carbon), some of which are used to power engines as fuel, and others in the manufacturing of plastics or other compounds. A distillation process separates between them. Alongside distillation, there is a range of separation techniques – some physical, others chemical. The former are based on the physical properties of materials, i.e., properties that can be observed or measured without changing the identity of the material (for example, its state of matter), while chemical methods are based on chemical properties – which determine substance identity.

Physical separation methods

Physical separation methods, such as filtration and distillation, are based on the difference in particle size and on the boiling point of the substances in the mixture, respectively. These are properties that can be observed and measured without changing the material itself.

Filtration

This is the simplest separation method, which can be conducted using basic household equipment. In daily life, it is applied in the separation of solids from the liquids in which they were cooked – pasta, for example.

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Filtration is based on the fact that the smaller water particles can easily pass through the filter, which retains the larger solid particles. When straining pasta, our interest lies in the solids, but in other cases, it is the liquid that we seek, so we need to remove the larger solids, keeping those in the filter. The filter hole size determines which materials are retained in the filter and which pass through it.

Sterilization is an example of an industrial application of filtration. To remove a bacterial contamination from a solution, the solution is passed through a filter. The microorganisms are trapped in the filter, while the smaller solution molecules pass through. Also called microfiltration (because of the relatively small size of the molecules), this process is used for sterilization when other techniques, such as heating or ultra-violet radiation, are inapplicable due to their potential harmful effects on the solution’s molecules.

2. Differentiate between the following

a. Accuracy and Precision

b. Determinate and Indeterminate Errors

3. What are the applications of chromatography technique in environmental monitoring?

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4. Explain the following with suitable examples

a. Chemical equilibrium & Dynamic equilibrium

b. Aromatic hydrocarbons as environmental pollutants

c. Biochemical effects of Arsenic & Mercury

d. Mechanism of adsorption

5. Give a note on scintillation process and working mechanism of scintillation counter?

6. Explain the reasons for the following?

a. HF stored in copper bottles and not glass bottles

b. Sodium hypochlorite used as a disinfectant

c. Graphite acts as a lubricant

d. Lead components are added to gasoline and why was it removed with the advent of catalytic convertors

e. TEL was banned as a gasoline additive

7. Explain basic instrumentation for IR Spectrometry and its environmental applications? 9

8. a) What is global warming? How is it different from greenhouse effect? What are the environmental outcomes of global warming?

b) Describe the mechanism of ozone formation in the lower troposphere?

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IGNOU MSCENV Solved Assignment

IGNOU MSCENV Solved Assignment: MEV 013 Solved Assignment 2021-22: Those students who had successfully submitted their Assignments to their allocated study centres can now check their Assignment Status. Alongside assignment status, they will also checkout their assignment marks & result. IGNOU MSCENV Solved Assignment 2021-22: All this is often available in a web mode. After submitting the assignment, you'll check you IGNOU Assignment Status only after 3-4 weeks. it'd take 40 days to declare.

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Once the TEE assignments are submitted to the Centres, it's send to the evaluation department. MEV 013 Solved Assignment 2021-22: After which the evaluation of IGNOU Assignment Solutions takes place.