NIOS CLASS 12TH Chemistry (313) SOLVED TMA In English Medium PDF SESSION 2024-25

Which is Applicable for March/April & October/November 2025 Examination.

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➛ This Nios Tutor Marked Assignment (TMA) is Only valid for 2024-25 Academic Session.
➛ which is Applicable for March/April & October/November 2025 Examination.
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Note -

➛ 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.

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TMA Questions

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

A) Classify the elements of group 14, 15 and 16 into metals, non-metals and metalloids.

B) Write the names of the elements with atomic numbers 105, 109, 112, 115 according to IUPAC nomenclature.

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

A) How do metallic and ionic substances differ in conducting electricity? (See Lesson-3)

B) The unit cell of a metallic element is face centered cubic and the side of the cube is 540.2 pm. Calculate the density of the metal in gcm–3 if its relative atomic mass is 202.4.

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

A) For the reaction 2NO (g) +O2 (g) → 2NO2 (g) Calculate ΔrG at 700 K when enthalpy and entropy changes (ΔrH and ΔrS) are respectively – 113.0 kJ mol-1 and –145 JK-1 mol-1

B) What must be the value of (Ea) if the rate constant for a reaction is doubled when the temperature increases from 300K to 310K?

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

A) Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.

(i) Sludge is scraped out and skimmer removes floating grease.
(ii) Water is made to settle in a large tank with a slope in the middle.
(iii) Large objects like plastic bags are removed by passing wastewater through bar screens.
(iv) Sand, grit and pebbles are made to settle by decreasing the speed of incoming
wastewater.
(v) Wastewater enters a grit and sand removal tank.

B) Calculate the equilibrium constant for the reaction A(g) + B(g) ⇌ C(g) + D(g) If at equilibrium 1 mol of A, 0.5 mole of B, 3.0 mole of C and 10 mol of D are present in a one litre vessel.

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

A) Describe the underlying principle of each of the following metal refining methods:
(i) Electrolytic refining of metals
(ii) Vapour phase refining of metals

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

OR
Observe the given figure and answer the following:
(i) What does this figure show?
(ii) State the functions of each part of the figure?

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

A) Complete the table given blow of the contaminant survey.

B) Chemistry is deeply embedded in our daily experiences. Answer the following questions regarding the presence and impact of chemistry in your everyday life. (See Lesson-32)

(i) How do you perceive the presence of chemistry in your daily routines or activities? Can you identify any specific examples where chemistry plays a significant role? (e.g., food preparation, cleaning products, personal care items, etc.)

(ii) Have you ever considered the chemical composition or reactions behind common household items or products you use? Please provide examples and elaborate on your understanding.

(iii)In what ways does chemistry influence the food you consume or prepare? How do chemical reactions impact cooking or food preservation techniques?

(iv)Can you identify any environmental issues related to chemical usage in everyday life? How do you think these issues could be mitigated or improved?

(v) How does chemistry contribute to advancements in medicine and healthcare? Can you discuss any specific pharmaceutical products or medical procedures that showcase the role of chemistry in improving human health?

(vi)What role does chemistry play in personal hygiene products or cosmetics that you use? Are you aware of any chemical risks associated with these products?

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Most Important Facts relating to TMA:

➛ This assignment solution is based on the latest session 2024-25.
➛ The Last date of submission of this assignment is 31 January 2025 (For April examination).
➛ The Last date of submission of this assignment is 31 August 2025 (For Oct. examination).
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