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RAWALPINDI BOARD
Chemistry (New Scheme)
Session: 2022
Group-I / A-2022
SSC (Part-II)
Class – 10th
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 & D to each question are given. Fill the corresponding circle A, B, C, or D with a marker or pen ink on the provided answer sheet.

Q1. About 99% of the atmosphere’s mass lies within:
A) 30 kilometers  B) 35 kilometers  C) 15 kilometers  D) 11 kilometers

Q2. Which of the following is not a greenhouse effect?
A) Increasing atmospheric temperature  B) Increasing food chain
C) Increasing flood risks  D) Increasing sea level

Q3. The specific heat capacity of water is:
A) 4.2 J/gK  B) 4.2 KJ/gK  C) 2.4 KJ/gK  D) 3.2 J/gK

Q4. Global warming is due to:
A) CO  B) O₂  C) CO₂  D) O₃

Q5. An acute infection caused by the bacteria Vibrio cholerae is:
A) Dysentery  B) Cholera  C) Hookworm  D) Typhoid

Q6. Crude oil is heated in the furnace up to:
A) 300°C  B) 350°C  C) 400°C  D) 450°C

Q7. A reverse reaction is one:
A) Which proceeds from left to right  B) In which reactants form products
C) Which slows down gradually  D) Which speeds up gradually

Q8. What is the pOH of 0.02 M Ca(OH)₂?
A) 1.698  B) 1.397  C) 12.31  D) 12.61

Q9. Coal gas is a mixture of:
A) CO and CH₄  B) CO, CH₄, and CO₂  C) CO, CH₄, and H₂  D) CO, H₂, and CO₂

Q10. Which scientist prepared urea in the laboratory?
A) Wohler  B) Rutherford  C) Berzelius  D) Dalton

Q11. The reduction of alkyl halides takes place in the presence of:
A) Zn/HCl  B) Na/HCl  C) Mg/HCl  D) Cu/HCl

Q12. Which one of the following is a fat-soluble vitamin?
A) A  B) E  C) K  D) All of these

RAWALPINDI 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 parts. (5×2 = 10)

1. Write any two characteristics of an irreversible reaction.
2. What happens when the value of Kc is neither small nor large?
3. Write the ester formation test.
4. What is an alcoholic group? Write its general formula.
5. Write the structural formula of n-butane and isobutane.
6. Define Ether Linkage and give one example.
7. Write two characteristics of DNA.
8. Write the names of fat-soluble vitamins and the role of vitamin D.

Write short answers to any Five parts. (5×2 = 10)

1. Why does H⁺ ion act as a Lewis acid?
2. Define pH. What is the pH of pure water?
3. How are alkyl halides reduced?
4. Write dot and cross, and structural formulae of ethyne.
5. Write two advantages of Solvay’s process.
6. How is ammonia prepared for the synthesis of urea?
7. Write down the names of two fractions obtained by the fractional distillation of residual oil.
8. Define minerals.

Write short answers to any Five parts. (5×2 = 10)

1. What do you mean by atmosphere?
2. Name the major constituents of the troposphere.
3. How is acid rain produced?
4. What is meant by the ozone hole?
5. What is capillary action?
6. Differentiate between soft and hard water.
7. Why is a water molecule polar?
8. What do you mean by waterborne diseases?

SUBJECTIVE PART-II

Attempt any two questions.

Q5.
(a) What are vitamins? Also, describe their importance.
(b) Compare the characteristics properties of forward and reverse reactions.

Q6.
(a) Explain the Lewis concept of acids and bases.
(b) Write down any four properties of water.

Q7.
(a) Write a note on the “Importance of Urea.”
(b) How are alkenes prepared? Explain two methods with the help of equations.