BOARD PAPERS 2022
SAHIWAL BOARD
Chemistry (New Scheme)
(Session: 2022)
(Group-I / A-2022)
SSC (Part-II)
Class: 10th
New Scheme
Time: 15 Minutes
Marks: 12
Note: Write answers to the questions on the objective answer sheet provided. Four possible answers (A, B, C, D) are given for each question. Fill the corresponding circle on the answer sheet with marker or pen ink.
OBJECTIVE SECTION
- Substitution reaction is the characteristic of:
- A) Alkanes
- B) Alkenes
- C) Alkynes
- D) None of these
- Which gas protects the Earth’s surface from ultraviolet radiations?
- A) CO₂
- B) CO
- C) N₂
- D) O₃
- A group of gases that maintains the temperature of the atmosphere is:
- A) CO₂ and H₂O vapours
- B) N₂ and CO₂
- C) N₂ and O₂
- D) None of these
- A bond formed between two amino acids is:
- A) Peptide Linkage
- B) Covalent bond
- C) Hydrogen bond
- D) Glycosidic linkage
- The value of Kc depends upon:
- A) Pressure
- B) Volume
- C) Temperature
- D) Density
- When NaHCO₃ is heated, it forms:
- A) Ca(OH)₂
- B) CaCO₃
- C) CaO
- D) None of these
- Hookworm infects:
- A) Liver
- B) Small Intestine
- C) Large Intestine
- D) Stomach
- The product of a Lewis acid-base reaction is called an adduct. The bond between adduct species is:
- A) Ionic
- B) Covalent
- C) Metallic
- D) Coordinate covalent
- Which one of the given compounds is a ketone?
- A) (CH₃)₂CHOH
- B) (CH₃)CO
- C) (CH₃)₂NH
- D) (CH₃)≥CHCl
- The formula of an alkyl radical is:
- A) CₙH₂ₙ₊₂
- B) CₙH₂ₙ₋₂
- C) CₙH₂ₙ₊₁
- D) CₙH₂ₙ₋₁
- The cause of ozone depletion is:
- A) CO₂
- B) CFCs
- C) Fluorine
- D) Hydrogen
- Sodium zeolite is a naturally occurring resin of:
- A) Na₂CO₃
- B) NaAl(SiO₄)₂
- C) CaCO₃
- D) Na₂SiO₃
SAHIWAL BOARD
(Session: 2022)
(Group-I / A-2022)
Class: 10th
New Scheme
SUBJECTIVE SECTION
Marks: 48
SECTION-I
(5 x 2 = 10)
Write short answers to any five parts:
- Define Chemical Equilibrium state.
- If the reaction quotient Q of a reaction is more than Kc, what will be the direction of the reaction?
- How is coal formed?
- Why are benzene and other homologous compounds of benzene called aromatic compounds?
- What is meant by the term Catenation? Give an example of a compound that displays Catenation.
- What are heterocyclic compounds? Give an example.
- How do plants synthesize carbohydrates?
- What is the function of DNA?
Write short answers to any five parts:
- Write the use of Aluminium Hydroxide.
- How are insoluble salts prepared? Give an example.
- Write the oxidation of alkenes with KMnO₄.
- Why are alkanes used as fuel?
- Differentiate between Ores and Minerals.
- What is the role of pine oil in the froth flotation process?
- What is the difference between blister copper and matte?
- Write the uses of fuel oil and kerosene oil.
Write short answers to any five parts:
- Define Primary Pollutants and give two examples.
- Write down two effects of SO₂.
- Why does acid rain damage buildings?
- Write down two effects of Ozone depletion.
- Name two properties of water that make it an excellent solvent.
- Explain the method of removing temporary hardness of water by boiling.
- Why is the use of detergents increasing day by day?
- Define Waterborne Diseases.
SUBJECTIVE PART-II
(Attempt any two questions)
- (a) What are vitamins? Explain the importance of vitamins.
(b) Write down four macroscopic characteristics of dynamic equilibrium. - (a) What are salts? Give any four characteristic properties of salts.
(b) Write any four properties of water. - (a) What is the percentage of Nitrogen in urea? Write down the importance of urea.
(b) Write down four physical properties of alkenes.