TS Inter 1st Year Chemistry Answer Key 2025 (Available) with Exam Analysis, Student Reviews

1. What are isotonic solutions?

Isotonic solutions have the same solute and water concentrations as body fluids, meaning there's no net movement of water across a semipermeable membrane, and cells maintain their normal size and function.

2. Explain the terms gangue and slag.

Gangue refers to the unwanted impurities in an ore, while Slag is the fused material formed when a flux (a substance added to facilitate the removal of impurities) reacts with the gangue during smelting

3. Calculate the 'spin only' magnetic moment of fe ²⁺ _(aq) ion

4.9 B.M.

4. What are food preservatives? Give example.

Food preservatives are substances added to food to prevent spoilage and extend shelf life, acting as chemicals that inhibit microbial growth, oxidation, and browning. Examples include salt, sugar, vinegar, and synthetic preservatives like sodium benzoate.

5. NH ₃ , forms hydrogen bonds but PH ₃ does not - Why?

Ammonia (NH3) forms hydrogen bonds due to the high electronegativity of nitrogen, leading to a strong polarity of the N-H bond, while phosphine (PH3) does not because phosphorus is less electronegative, resulting in a weaker polarity of the P-H bond.

6. What is addition polymer? Give example.

Addition polymers are formed by the repeated addition of monomer units with double or triple bonds, without any atoms being lost, like polyethylene (from ethene) or polystyrene (from styrene).

7. What are antacids? Give example.

Antacids are medications that neutralize excess stomach acid, providing relief from heartburn, indigestion, and upset stomach. Common examples include calcium carbonate (like Tums), magnesium hydroxide (like Milk of Magnesia), and aluminum hydroxide (like Maalox)

8. What is metallic corrosion? Give one example.

Metallic corrosion is the gradual deterioration of a metal due to a chemical reaction with its environment, often involving oxidation and moisture. A common example is the rusting of iron.

9. What is Ziegler-Natta catalyst?

A Ziegler-Natta catalyst is a type of coordination catalyst, used for polymerizing olefins (alkenes), particularly in the production of polymers like polyethylene and polypropylene, and is composed of a transition metal compound (like titanium tetrachloride) and an organoaluminum compound (like triethylaluminum)

10. Write the names of the following compounds and classify them into primary, secondary, and tertiary amines (i) (CH ₃ ) ₂ CHNH ₂ (ii) CH ₃ (CH ₂ )2NH

(i) (Propan-2-amine) (1 ° amine)
(ii) (Propan-1-amine) (1° amine)

Overall difficulty level of the paper

Easy to Moderate

Difficulty Level of Section A

Easy to Moderate

Difficulty Level of Section B

Easy to Moderate

Difficulty Level of Section C

Moderate

Expected Good Score

50+

Time-Consuming Question (If any)

None

Topics with Maximum Weightage

To be Updated