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

Note: Write answers to the questions on the objective answer sheet provided. Four possible answers A, B, C, & D to each question are given. Choose the correct answer and fill the corresponding circle A, B, C, or D on the answer sheet with a marker or pen.

1. For the reaction between PCl and Cl to form PCl₅, the units of Kc are:
A) mol-1·dm³  B) mol/dm³  C) mol/dm  D) mol/dm³

2. The conjugate acid of HPO₄²⁻ is:
A) PO₄³⁻  B) H₃PO₄  C) H₂PO₄⁻  D) H₃PO₂

3. The general formula of alkyl radical is:
A) CₙH₂ₙ₊₂  B) CₙH₂ₙ₋₂  C) CₙH₂ₙ₊₁  D) CₙH₂ₙ

4. Coal gas is a mixture of:
A) CO & CH₄  B) CO₂, CH₄ & CO  C) CO₂, CH₄ & H₂  D) CO, H₂ & CO₂

5. A hydrocarbon has the molecular formula C₆H₁₄. What is the molecular formula of the next member of the same homologous series?
A) C₇H₁₆  B) C₈H₁₈  C) C₉H₂₂  D) C₁₀H₂₀

6. Night blindness is caused by a deficiency of:
A) Vitamin A  B) Vitamin E  C) Vitamin C  D) Vitamin D

7. The percentage amount of Argon in air is:
A) 78.09%  B) 20.94%  C) 0.93%  D) 0.03%

8. Normally, rainwater is weakly acidic because of:
A) SO₃ gas  B) CO₂ gas  C) SO₂ gas  D) NO₂ gas

9. Just above the Earth’s surface is:
A) Mesosphere  B) Stratosphere  C) Thermosphere  D) Troposphere

10. Temporary hardness in water is due to:
A) Ca(HCO₃)₂  B) CaCO₃  C) MgCO₃  D) MgSO₄

11. Which one of the following gases is used to destroy harmful bacteria in water?
A) Iodine  B) Chlorine  C) Fluorine  D) Bromine

12. Crude oil is heated in a furnace up to:
A) 300°C  B) 350°C  C) 400°C  D) 450°C

SARGODHA BOARD
Session: 2022
Group-I / A-2022
Class-10th
New Scheme
(SUBJECTIVE)
Marks: 48

Instructions:

• Section I is compulsory.
• Attempt any Two questions from Section II.

SECTION-I

Write short answers to any five (5) of the following questions.

1. Write the use of oxygen and nitrogen in the manufacture of chemicals.
2. What is an irreversible reaction? Give an example.
3. Define molecular formula. Give an example.
4. Write two basic conditions required for an element to exhibit catenation.
5. What is isomerism? Give an example.
6. How is an amino group tested?
7. What is meant by triglycerides? Write their general formula.
8. Write two properties of polysaccharides.

Write short answers to any five (5) of the following questions.

1. Water is an amphoteric compound. Provide an equation to demonstrate this.
2. Write two uses of acetic acid.
3. Why is methane called marsh gas?
4. Why are alkenes called olefins?
5. Write the composition and boiling range of diesel oil.
6. Draw and label the diagram of a Bessemer converter.
7. Mention any two raw materials used in Solvay’s process.
8. What is calcination? Provide a reaction.

Write short answers to any five (5) of the following questions.

1. What do you mean by atmosphere?
2. Identify whether the following are primary or secondary air pollutants: CH₄, NH₃, H₂SO₄, O₃.
3. How is the ozone layer formed in the stratosphere?
4. What are pollutants and contaminants?
5. How does water dissolve sugar and alcohol?
6. Mention two disadvantages of detergents.
7. Why are pesticides used?
8. What are waterborne infectious diseases?

SECTION-II

Attempt any two (2) questions.

Q.5
a) Explain the structure of DNA and how DNA carries the genetic code of life.
b) How can we predict the extent of a reaction using the equilibrium constant?

Q.6
a) Define a salt and provide the characteristic properties of salts.
b) Explain why water is considered a universal solvent.

Q.7
a) Explain the process of Bessemerization with balanced chemical equations.
b) Write any four uses of ethylene (ethene).