FAISALABAD BOARD
Chemistry (New Scheme)
Session: 2022
Class – 10th (Group-1 / A-2022)
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) to each question are given. Fill the corresponding circle (A, B, C, or D) with marker or pen ink on the answer sheet provided.
OBJECTIVE SECTION
1. When CO₂ is passed through ammoniacal brine, the only salt that precipitates is:
A) NaHCO₃
B) NH₄HCO₃
C) Na₂CO₃
D) (NH₄)₂CO₃
2. Specific heat capacity of water is:
A) 4.2 kJ/kg·K
B) 4.2 J/g·K
C) 2.4 kJ/kg·K
D) 2.4 J/g·K
3. Temporary hardness is removed by adding:
A) Quick lime
B) Sodium bicarbonate
C) Limestone
D) Lime water
4. Height of mesosphere is about:
A) 0-12 km
B) 12-50 km
C) 50-85 km
D) 85-120 km
5. Which gas protects the Earth’s surface from ultraviolet radiations?
A) CO₂
B) CO
C) N₂
D) O₃
6. Ozone is beneficial for us as it absorbs:
A) Infrared radiations
B) Ultraviolet radiations
C) Chlorofluorocarbons
D) Air pollutants
7. Which is a fat-soluble vitamin?
A) Vitamin A
B) Vitamin E
C) Vitamin K
D) All these
8. The end product of oxidation of acetylene is:
A) Oxalic acid
B) Glycol
C) Glyoxal
D) None of these
9. The functional group -COOH is found in:
A) Carboxylic acids
B) Aldehydes
C) Alcohols
D) Esters
10. Which is a synthetic fiber?
A) Cotton
B) Natural gas
C) Nylon
D) Petroleum
11. Which ion is the conjugate base of sulfuric acid?
A) SO₄²⁻
B) H₂SO₄
C) HSO₄⁻
D) HSO₃⁻
12. For a reaction between PCl₅ and Cl₂ to form PCl₃, the units of Kc are:
A) mol/dm³
B) mol2/dm³
C) mol3/dm³
D) mol4/dm³
FAISALABAD BOARD
Chemistry (New Scheme)
Session: 2022
Class – 10th (Group-1 / A-2022)
New Scheme
Marks: 48
SECTION-I
Write short answers to any five parts. (5 x 2 = 10)
- Differentiate between reversible and irreversible reactions.
- How can the direction of a reaction be predicted?
- Define functional group with an example.
- Write two characteristics of homologous series.
- Justify that organic compounds are used as food.
- What is the importance of natural gas?
- Name two fatty acids with their formulae.
- How do plants synthesize carbohydrates? Write the equation.
Write short answers to any five parts. (5 x 2 = 10)
- What is a basic salt? Give an example.
- Define Arrhenius base with an example.
- What is incomplete combustion of methane? Give its reaction.
- Give two uses of chloroform.
- Give the chemical reaction in the ammonia recovery tower.
- What is granulation of urea?
- Write the composition and boiling range of fuel oil.
- How is ammonia prepared by the Haber process?
Write short answers to any five parts. (5 x 2 = 10)
- Write two sources of oxides of carbon.
- Name two constituents of the troposphere.
- Write two effects of SO₂ gas.
- Identify as primary or secondary air pollutants:
(a) SO₂
(b) CH₄
(c) HNO₃
(d) H₂SO₄ - What do you mean by boiler scales? How are they removed?
- Differentiate between soft water and hard water.
- Write two physical properties of water.
- How is the hardness of water removed by Clark’s method? Also, write the equation.
SUBJECTIVE PART-II
Attempt any two questions.
- (a) What are vitamins? Describe water-soluble vitamins. Write the importance of vitamins.
(b) Define equilibrium constant. Explain its units with the given reaction:
N₂ + 3H₂ → 2NH₃ - (a) How are salts named? Describe the characteristic properties of salts.
(b) Define waterborne diseases. Write measures for the prevention of waterborne diseases. - (a) Write the advantages of the Solvay process.
(b) Describe two methods for the preparation of alkenes.