NIOS TMA Chemistry (313) Tutor Marked Assignment 2021PK Kapri & Co.
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Check Your Questions Papers and Instructions below: Chemistry (313) Tutor Marked Assignment Session 2020-21 (Chemistry-313) -12th Class
Note : (i) All questions are compulsory. The marks allotted for each question are given beside the questions.
(ii) Write your name enrollment numbers, AI name subject on the top of the first page of the answer sheet.
(1) Answer any one of the following questions in about 40-60 words.
(a) Arrange the following in order of increasing electron gain enthalpy. Justify your answer.
F, Cl, Br, I
(b) Although the size of sulphur is smaller than phosphorous but first ionisation enthalpy of phosphorous is more than sulphur. Why?
(2) Answer any one out of the following questions in about 40 to 60 words.
(a) The unit cell of a metallic element is face centred cubic and the side of the cube is 540.2 pm. Calculate the density of a metal in gcm-3 is if its relative atomic mass is 202.4.
(b) What type of semiconductor obtained when Si or Ge are doped with elements of group 13 such as B or Al and why?
(3) Answer any one out of the following questions in about 40 to 60 words.
(a) Explain with example reversible and irrevesible reactions.
(b) Give the structure of an oxide of nitrogen containing N–O–N bond. Describe its nature.
(4) Answer any one out of the following questions in about 100 to 150 words.
(a) (i) What is the relationship between the standard Gibbs energy change and the equilibrium constant of the reaction?
(ii) Differentiate between physical and chemical adsorptions.
(b) (i) Give reason of the following–
- Glycerol retards the decomposition of hydrogen peroxide
- The oxidation of hydrochloric gas by oxygen occurs more quickly if the gases passed over cupric chloride.
(ii) What do you mean by acid rain? Which gases are responsible for acid rain?
(5) Answer any one out of the following questions in about 100 to 150 words.
(a) (i) What type of metal are extracted by electrolysis method?
(ii) Name one metal which is obtained by self reduction process.
(iii) What happens when borax is treated with sulphuric acid?
(iv) What happens when Mg is treated with conc. HNO3?
(b) Identify the Vitamins in each case whose deficiency causes the following symptom.
(iii) Dry skin
(ii) Give Two examples of artificial sweetening agents.
(6) Prepare any one project out of the following projects given below.
(a) Visit nearby medical shop. Collect knowledge of different medicines used for different kinds of diseases.
(i) Differentiate between drugs and medicines.
(ii)How are medicines classified?
(iii) What is self-medication? What are of its ill-effects?
(iv) Give an example of Antipyretics.
(v) Name the medicines generally used during winter season.
(vi) Categories the above medicines.
(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 desinfectant to kill bacteria?
(vi) How chlorine produces toxic and potentially carcinogens?