LAHORE BOARD
SSC (Part-II)
Session: 2022 (Group-1 / A-2022)
Class – 10th
New Scheme
Time: 15 Minutes
Marks: 12

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Note:
Write answers to the questions on the objective answer sheet provided. Four possible answers A, B, C, and D to each question are given. Which answer you consider correct, fill the corresponding circle A, B, C, or D given in front of each question with a marker or pen ink on the answer sheet provided.

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OBJECTIVE SECTION

1. Which gas is used to prepare ammonia?
   (A) N₂
   (B) O₂
   (C) Cl₂
   (D) SO₂
2. Dilute acids react with carbonates to produce the given product except:
   (A) Water
   (B) Carbon dioxide
   (C) Hydrogen
   (D) Salt
3. The example of a heterocyclic compound is:
   (A) Benzene
   (B) Hexane
   (C) Cyclohexane
   (D) Pyridine
4. Which one of the following is a synthetic fiber?
   (A) Cotton
   (B) Silk
   (C) Wool
   (D) Nylon
5. Which one of these is a saturated hydrocarbon?
   (A) CH₄
   (B) C₃H₈
   (C) C₅H₈
   (D) C₅H₁₂
6. The sources of galactose are:
   (A) Fruits
   (B) Rice
   (C) Cotton
   (D) Cellulose
7. PAN stands for:
   (A) Poly aniline nitrate
   (B) Peroxy acetyl nitrate
   (C) Poly acetyl nitrate
   (D) Polyoxy acetyl nitrate
8. The main cause of global warming is:
   (A) O₂ gas
   (B) N₂ gas
   (C) CO₂ gas
   (D) CO gas
9. The envelope of different gases around the earth is called:
   (A) Atmosphere
   (B) Biosphere
   (C) Lithosphere
   (D) Hydrosphere
10. Water has maximum density at:
    (A) 10°C
    (B) 4°C
    (C) 0°C
    (D) 100°C
11. Which one of the following ions does not cause hardness in water?
    (A) Ca²⁺
    (B) Mg²⁺
    (C) SO₄²⁻
    (D) Na⁺
12. Red hair contains a compound of:
    (A) Iron
    (B) Copper
    (C) Titanium
    (D) Molybdenum

SSC (Part-II)
Session: 2022
Class – 10th (Group-I / A-2022)
New Scheme
Marks: 48

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Note:
Section I is compulsory. Attempt any two questions from Section II (subjective part).

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SECTION-I

Write short answers to any five parts. (5 x 2 = 10)

1. If the reaction quotient $Q$ of a reaction is more than $K$, what will be the direction of the reaction?
2. What are monosaccharides? Give one example.
3. What is ammonical liquor?
4. Write down two characteristics of homologous series.
5. Define organic compound with an example.
6. What is coal tar?
7. Describe the sources and uses of vitamin A.
8. Why are the ten amino acids essential for us?

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SECTION-II

Write short answers to any five parts. (5 x 2 = 10)

1. Name two acids used in the manufacturing of fertilizers.
2. How are soluble salts recovered from water?
3. Write down two uses of ethene.
4. Why are alkanes called paraffins?
5. What is the principle of Solvay’s process?
6. Write down the names and formulae of two copper ores.
7. Write two uses of fuel oil.
8. What is roasting?

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SECTION-III

Write short answers to any five parts. (5 x 2 = 10)

1. Write the composition of air in dry state.
2. What is the ozone hole? Where was it noticed first?
3. Why does temperature decrease in the troposphere?
4. How does acid rain increase the acidity of soil?
5. How does limestone dissolve in water?
6. Compare soft and hard water.
7. Why are pesticides used?
8. How does the boiling process remove hardness from water? Give the reaction.

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SUBJECTIVE PART-II

Attempt any two questions.

5. (a) Explain the sources and uses of proteins.
   (b) Determine the concentration units for the following reactions:
   (i) H2+I2→2HIH_2 + I_2 \rightarrow 2HIH2​+I2​→2HI
   (ii) N2+3H2→2NH3N_2 + 3H_2 \rightarrow 2NH_3N2​+3H2​→2NH3​
6. (a) Give uses of five different acids in everyday life.
   (b) Define hard water. Give three disadvantages of hard water.
7. (a) Define concentration of ores. Explain gravity separation and froth flotation process of ore concentration.
   (b) Describe the physical properties of alkynes.