TS Inter 1st Year Chemistry Guess Paper 2025

The Telangana Board of Intermediate Education (TGBIE) will conduct the TS Inter 1st Year Chemistry exam on March 19, 2025. With less than a month left for the exam, students should make the most of their preparation time by practicing important questions from the TS Inter 1st Year Chemistry Guess Paper 2025. This will help them understand the paper format, topic-wise weightage, and frequently asked questions.

TS Inter 1st Year Chemistry Exam Pattern 2025

The Chemistry theory exam consists of 60 marks, divided into three sections:

Section A: Very Short Answer Type Questions (2 marks each)
Section B: Short Answer Type Questions (4 marks each)
Section C: Long Answer Type Questions (8 marks each)

Students should familiarize themselves with the types of questions expected in each section. Below is a section-wise guess paper for Chemistry along with the answers.

Section A: Very Short Answer Type Questions (2 Marks Each)

What is COD and BOD?
- COD (Chemical Oxygen Demand) measures the total quantity of oxygen required to oxidize organic and inorganic matter in water.
- BOD (Biochemical Oxygen Demand) measures the oxygen required by microorganisms to decompose organic matter in water.
What is plaster of Paris? Mention its uses.
- Plaster of Paris (POP) is chemically calcium sulfate hemihydrate (CaSO₄·½H₂O).
- Uses: Used in making statues, medical bandages, and wall coatings.
Why is a pressure cooker used for cooking in the hills?
- At high altitudes, atmospheric pressure is low, reducing the boiling point of water. A pressure cooker increases the pressure inside, raising the boiling point and allowing food to cook faster.
Name any two man-made silicates.
- Glass and Cement.
How is producer gas prepared?
- Producer gas is prepared by passing air and steam over red-hot coke (C + O₂ → CO + N₂).
Write the use of ZSM-5.
- ZSM-5 is a zeolite catalyst used in petroleum refining and hydrocarbon conversion.
What is meant by the ionic product of water? What is the value of K_w at 25°C?
- The ionic product of water (K_w) is the product of concentrations of hydrogen (H⁺) and hydroxide (OH⁻) ions in water.
- K_w at 25°C = 1 × 10⁻¹⁴ mol²/L².
What are disproportionation reactions? Give an example.
- Disproportionation reactions involve the same element undergoing simultaneous oxidation and reduction.
- Example: 2H₂O₂ → 2H₂O + O₂ (Decomposition of hydrogen peroxide).

Section B: Short Answer Type Questions (4 Marks Each)

Explain the structure of Diborane.
- Diborane (B₂H₆) has a three-center, two-electron bond where two hydrogen atoms bridge two boron atoms.
- Boron forms sp³ hybridization with one vacant orbital.
What is hardness of water? How is hardness of water removed?
- Hardness is due to dissolved salts of Ca²⁺ and Mg²⁺.
- Removal:
  - Temporary Hardness: Boiling or adding Ca(OH)₂.
  - Permanent Hardness: Ion exchange method (Zeolite or resin method).
State Saytzeff’s rule and give suitable examples.
- Saytzeff’s rule states that during dehydration of alcohols or dehydrohalogenation of alkyl halides, the major product is the more substituted alkene.
- Example: C₂H₅Br → CH₂=CH₂ + HBr.
Explain: a) Position Isomerism
- Isomers differ in the position of the functional group.
- Example: 1-Propanol and 2-Propanol.
b) Functional Group Isomerism
- Isomers have different functional groups but the same molecular formula.
- Example: Ethanol (C₂H₅OH) and Dimethyl Ether (CH₃OCH₃).
Explain extensive and intensive properties.
- Extensive: Depends on the amount of substance (Mass, Volume, Energy).
- Intensive: Independent of the amount (Temperature, Density, Boiling Point).
Write a few lines on the utility of hydrogen as a fuel.
- Hydrogen is a clean fuel, producing only water upon combustion.
- Used in fuel cells and rocket propulsion.

Section C: Long Answer Type Questions (8 Marks Each)

Write an essay on s, p, d, and f block elements.
- Elements are classified into s, p, d, and f blocks based on their valence electron configuration.
- s-block: Alkali and alkaline earth metals.
- p-block: Includes groups 13-18.
- d-block: Transition metals.
- f-block: Lanthanides and actinides.
How are the quantum numbers (n, l, and m) derived? Explain their significance.
- Quantum numbers describe electron arrangement:
  - n (Principal Quantum Number): Energy level.
  - l (Azimuthal Quantum Number): Subshell shape.
  - m (Magnetic Quantum Number): Orientation.
  - s (Spin Quantum Number): Electron spin.
Give the molecular orbital energy diagrams of: a) N₂
- Bond Order = (8-2)/2 = 3.
- Diamagnetic.
b) O₂
- Bond Order = (8-4)/2 = 2.
- Paramagnetic (due to unpaired electrons in π* orbitals).

Conclusion

The TS Inter 1st Year Chemistry Guess Paper 2025 provides students with a structured way to prepare for their upcoming exam. By solving these expected questions along with answers, students will gain familiarity with the exam pattern, key concepts, and important topics. Stay consistent, revise regularly, and practice well to score high marks in Chemistry!

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