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.
- Mention the year in which Urea was synthesized in the laboratory:
(A) 1856
(B) 1914
(C) 1828
(D) 1947 - Which chemical is used in the dehydrohalogenation of alkyl halides?
(A) Aqueous NaOH
(B) Alcoholic KOH
(C) Aqueous KOH
(D) Alcoholic NaOH - Which one of the following is a reducing sugar?
(A) Glucose
(B) Maltose
(C) Sucrose
(D) Starch - Why is Ozone beneficial for us?
(A) Absorbs infrared radiations
(B) Absorbs ultraviolet radiations
(C) Absorbs chlorofluorocarbon
(D) Absorbs air pollutants - Depending upon the altitude variation, the atmosphere is divided into how many regions?
(A) One
(B) Two
(C) Three
(D) Four - 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 - Which one of the following ions does not cause hardness in water?
(A) Ca²⁺
(B) Mg²⁺
(C) SO₄²⁻
(D) Na⁺ - Which gas is used to destroy harmful bacteria in water?
(A) Iodine
(B) Bromine
(C) Chlorine
(D) Fluorine - 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 - If Qc<Kc, the reaction goes to:
(A) Left to Right
(B) Right to Left
(C) In equilibrium state
(D) Reaction stops - Which one base is used in alkaline batteries?
(A) NaOH
(B) Al(OH)₃
(C) KOH
(D) Mg(OH)₂ - 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)
- How is the direction of a reversible reaction predicted?
- Why does the reaction not stop at equilibrium?
- How is coal formed?
- Write any two radicals of Pentane.
- Define functional group and give an example.
- How are alkyl radicals formed? Give their general formula.
- Write two sources and uses of Vitamin D.
- What is the genetic code of life?
Write short answers to any five parts. (5 x 2 = 10)
- Define pH. What is the pH of pure water?
- Define amphoteric. Give an example.
- Why are alkenes called olefins?
- Why are hydrocarbons soluble in organic solvents?
- Give two uses of kerosene oil.
- Write down two raw materials for the preparation of sodium carbonate.
- How is NaHCO₃ converted to Na₂CO₃?
- Define minerals and ores.
Write short answers to any five parts. (5 x 2 = 10)
- Name the four natural spheres of Earth.
- What do you mean by atmosphere?
- Write any two effects of global warming.
- How is aquatic life affected by acid rain?
- What do you mean by jaundice?
- What is industrial waste?
- How does sodium zeolite soften water?
- What do you mean by boiler scales? How are they removed?
SUBJECTIVE PART-II
Attempt any two questions. (5 x 2 = 10)
- (a) What are monosaccharides? Write the structural formula and properties of monosaccharides.
(b) Describe types of equilibrium with examples of each. - (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. - (a) Write a detailed note on roasting and smelting, giving a specific example.
(b) Write four physical properties of alkenes.