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Bise Multan Past Paper Class 10th Chemistry 2025 First Time
Chemistry - Class 10
Student Name
Roll Number
Section
Time Allowed
2 hours
Total Marks
60
Chapters
Date
Examiner Signature
Bubble Sheet for Q.No.1 (MCQs) Fill the correct option bubble for each question number.
1.
A B C D
2.
A B C D
3.
A B C D
4.
A B C D
5.
A B C D
6.
A B C D
7.
A B C D
8.
A B C D
9.
A B C D
10.
A B C D
11.
A B C D
12.
A B C D
MAXIMUM MARKS: 12 OBJECTIVE
حصہ معروضی 		12 × 1 = 12 کل نمبر
سوال نمبر
Q.No.1
For each objective question four options (A–D) are given. Fill the bubble of the correct option against the question number on the bubble sheet.
Sr. No. Questions A B C D
(i)
For the given reaction, the expression for the equilibrium constant is: \( 2A_{(g)} + B_{(g)} \rightleftharpoons 3C_{(g)} \)
\( \frac{[2A][B]}{[3C]} \)
\( \frac{[A]^2 [B]}{[C]^3} \)
\( \frac{[3C]}{[2A][B]} \)
\( \frac{[C]^3}{[A]^2 [B]} \)
(ii)
When the magnitude of \( K_c \) is very small it indicates:
Equilibrium will never establish
All reactants will be converted to products
Reaction will go to completion
The amount of products will be negligible
(iii)
Which ion is the conjugate base of Sulphuric acid?
\( SO_4^{2-} \)
\( S^{2-} \)
\( HSO_4^- \)
\( HSO_3^- \)
(iv)
The product of Lewis acid-base reaction is called adduct. The bond between the adduct specie is:
Ionic bond
Covalent bond
Metallic bond
Coordinate covalent bond
(v)
Main component of natural gas is:
Methane
Propane
Butane
Propene
(vi)
Which one of these hydrocarbon molecules would have no effect on an aqueous solution of bromine?
\( CH_4 \)
\( C_{10}H_{20} \)
\( C_2H_4 \)
\( C_2H_2 \)
(vii)
Thousands of the amino acids polymerize to form:
Carbohydrates
Proteins
Lipids
Vitamins
(viii)
Which one of them is triglyceride?
Proteins
Vitamins
Carbohydrates
Lipids
(ix)
Buildings are being damaged by acid rain because it attacks:
Calcium sulphate
Calcium nitrate
Calcium carbonate
Calcium oxalate
(x)
Permanent hardness can be removed by ______
\( Na_2 \) Zeolite (Sodium zeolite)
Soda lime
Limewater
Quicklime
(xi)
Maximum density of water at \( 4^\circ C \) is:
\( 4 \text{ gcm}^{-3} \)
\( 1 \text{ gcm}^{-3} \)
\( 4 \text{ kgcm}^{-3} \)
\( 10 \text{ kgcm}^{-3} \)
(xii)
Crude oil is heated in the furnace upto ________
\( 300^\circ C \)
\( 350^\circ C \)
\( 400^\circ C \)
\( 450^\circ C \)
(i)
For the given reaction, the expression for the equilibrium constant is: \( 2A_{(g)} + B_{(g)} \rightleftharpoons 3C_{(g)} \)
(a) \( \frac{[2A][B]}{[3C]} \) (b) \( \frac{[A]^2 [B]}{[C]^3} \) (c) \( \frac{[3C]}{[2A][B]} \) (d) \( \frac{[C]^3}{[A]^2 [B]} \)
(ii)
When the magnitude of \( K_c \) is very small it indicates:
(a) Equilibrium will never establish (b) All reactants will be converted to products (c) Reaction will go to completion (d) The amount of products will be negligible
(iii)
Which ion is the conjugate base of Sulphuric acid?
(a) \( SO_4^{2-} \) (b) \( S^{2-} \) (c) \( HSO_4^- \) (d) \( HSO_3^- \)
(iv)
The product of Lewis acid-base reaction is called adduct. The bond between the adduct specie is:
(a) Ionic bond (b) Covalent bond (c) Metallic bond (d) Coordinate covalent bond
(v)
Main component of natural gas is:
(a) Methane (b) Propane (c) Butane (d) Propene
(vi)
Which one of these hydrocarbon molecules would have no effect on an aqueous solution of bromine?
(a) \( CH_4 \) (b) \( C_{10}H_{20} \) (c) \( C_2H_4 \) (d) \( C_2H_2 \)
(vii)
Thousands of the amino acids polymerize to form:
(a) Carbohydrates (b) Proteins (c) Lipids (d) Vitamins
(viii)
Which one of them is triglyceride?
(a) Proteins (b) Vitamins (c) Carbohydrates (d) Lipids
(ix)
Buildings are being damaged by acid rain because it attacks:
(a) Calcium sulphate (b) Calcium nitrate (c) Calcium carbonate (d) Calcium oxalate
(x)
Permanent hardness can be removed by ______
(a) \( Na_2 \) Zeolite (Sodium zeolite) (b) Soda lime (c) Limewater (d) Quicklime
(xi)
Maximum density of water at \( 4^\circ C \) is:
(a) \( 4 \text{ gcm}^{-3} \) (b) \( 1 \text{ gcm}^{-3} \) (c) \( 4 \text{ kgcm}^{-3} \) (d) \( 10 \text{ kgcm}^{-3} \)
(xii)
Crude oil is heated in the furnace upto ________
(a) \( 300^\circ C \) (b) \( 350^\circ C \) (c) \( 400^\circ C \) (d) \( 450^\circ C \)
Subjective Type (Part-I) / حصہ انشائیہ
Q. 2: Write short answers to any 5 questions. (2x5=10)
Max. Marks: 10
  1. (i)
    Define the law of mass action.
    lines
  2. (ii)
    What is relationship between active mass and rate of reaction?
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  3. (iii)
    Describe any two characteristics of forward reaction.
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  4. (iv)
    Define a conjugate acid and conjugate base.
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  5. (v)
    Name the acids present in: (i) Ant sting (ii) Sour milk
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  6. (vi)
    How are the insoluble salts prepared? Give examples.
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  7. (vii)
    Why Alkanes are called Paraffins?
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  8. (viii)
    What is meant by combustion? Give an example.
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Q. 3: Write short answers to any 5 questions. (2x5=10)
Max. Marks: 10
  1. (i)
    How are Alkyl radicals formed? Give an example.
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  2. (ii)
    Write the names of different types of coal.
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  3. (iii)
    Define petroleum.
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  4. (iv)
    What do you mean by non-essential amino acids?
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  5. (v)
    What is the difference between ghee and oil?
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  6. (vi)
    Name two primary air pollutants.
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  7. (vii)
    How ozone is beneficial for human kind? Explain.
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  8. (viii)
    Incineration of waste material causes air pollution. Justify?
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Q. 4: Write short answers to any 5 questions. (2x5=10)
Max. Marks: 10
  1. (i)
    Why are pesticides used?
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  2. (ii)
    What is cryptosporidium? Write its symptoms.
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  3. (iii)
    How permanent hardness can be removed by washing soda?
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  4. (iv)
    What is water pollution? Give its cause.
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  5. (v)
    Write down the names of any two metallurgical operations.
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  6. (vi)
    Write down the names of four fractions of residual oil.
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  7. (vii)
    How ammonium carbamate is converted to urea by evaporation?
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  8. (viii)
    What is difference between blister copper and matte?
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Section-II: Attempt any 2 questions. (9x2=18 marks)
  1. Q. 5
    1. (i) Write five different uses of bases in daily life.
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    2. (ii) What is Catenation? Write two basic conditions for an element to exhibit Catenation.
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  2. Q. 6
    1. (i) Explain halogenations of Alkanes with reactions.
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    2. (ii) Explain four uses of Carbohydrates in daily life.
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  3. Q. 7
    1. (i) What is the importance and status of urea?
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    2. (ii) Explain the four effects of ozone depletion.
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