D.G. KHAN BOARD
SSC (Part-II)
Session: 2022
Class – 10th (Group-I / A-2022)
New Scheme
Time: 15 Minutes
(OBJECTIVE)
Marks: 12


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. Fill the corresponding circle A, B, C, or D that you consider correct with marker or pen ink on the answer sheet provided.


  1. Mention the year in which Urea was synthesized in the laboratory:
    (A) 1856
    (B) 1914
    (C) 1828
    (D) 1947
  2. Which chemical is used in the dehydrohalogenation of alkyl halides?
    (A) Aqueous NaOH
    (B) Alcoholic KOH
    (C) Aqueous KOH
    (D) Alcoholic NaOH
  3. Which one of the following is a reducing sugar?
    (A) Glucose
    (B) Maltose
    (C) Sucrose
    (D) Starch
  4. Why is Ozone beneficial for us?
    (A) Absorbs infrared radiations
    (B) Absorbs ultraviolet radiations
    (C) Absorbs chlorofluorocarbon
    (D) Absorbs air pollutants
  5. Depending upon the altitude variation, the atmosphere is divided into how many regions?
    (A) One
    (B) Two
    (C) Three
    (D) Four
  6. Carbon monoxide is harmful to us because:
    (A) It paralyses the lungs
    (B) It damages lung tissues
    (C) It reduces oxygen-carrying ability of hemoglobin
    (D) It makes the blood coagulate
  7. Which one of the following ions does not cause hardness in water?
    (A) Ca²⁺
    (B) Mg²⁺
    (C) SO₄²⁻
    (D) Na⁺
  8. Which gas is used to destroy harmful bacteria in water?
    (A) Iodine
    (B) Bromine
    (C) Chlorine
    (D) Fluorine
  9. When copper pyrite is strongly heated in excess of air to convert it into a mixture of:
    (A) Cu₂O and FeS
    (B) Cu₂O and FeS
    (C) Cu₂S and FeS
    (D) Cu₂O and SO₂
  10. If Qc<Kc, the reaction goes to:
    (A) Left to Right
    (B) Right to Left
    (C) In equilibrium state
    (D) Reaction stops
  11. Which one base is used in alkaline batteries?
    (A) NaOH
    (B) Al(OH)₃
    (C) KOH
    (D) Mg(OH)₂
  12. Beside the valuable chemicals, the black residue of coal tar is called:
    (A) Peat
    (B) Pitch
    (C) Coke
    (D) Lignite

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


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


SECTION-I

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

  1. How is the direction of a reversible reaction predicted?
  2. Why does the reaction not stop at equilibrium?
  3. How is coal formed?
  4. Write any two radicals of Pentane.
  5. Define functional group and give an example.
  6. How are alkyl radicals formed? Give their general formula.
  7. Write two sources and uses of Vitamin D.
  8. What is the genetic code of life?

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

  1. Define pH. What is the pH of pure water?
  2. Define amphoteric. Give an example.
  3. Why are alkenes called olefins?
  4. Why are hydrocarbons soluble in organic solvents?
  5. Give two uses of kerosene oil.
  6. Write down two raw materials for the preparation of sodium carbonate.
  7. How is NaHCO₃ converted to Na₂CO₃?
  8. Define minerals and ores.

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

  1. Name the four natural spheres of Earth.
  2. What do you mean by atmosphere?
  3. Write any two effects of global warming.
  4. How is aquatic life affected by acid rain?
  5. What do you mean by jaundice?
  6. What is industrial waste?
  7. How does sodium zeolite soften water?
  8. What do you mean by boiler scales? How are they removed?

SUBJECTIVE PART-II

Attempt any two questions. (5 x 2 = 10)

  1. (a) What are monosaccharides? Write the structural formula and properties of monosaccharides.
    (b) Describe types of equilibrium with examples of each.
  2. (a) What is meant by salts? Define and write a balanced chemical equation for the following salts:
    (i) Normal Salts
    (ii) Acidic Salts
    (b) Explain methods for the removal of temporary hardness of water.
  3. (a) Write a detailed note on roasting and smelting, giving a specific example.
    (b) Write four physical properties of alkenes.

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