BISE Lahore · Class 12 · Chemistry

BISE Lahore · Class 12 · Chemistry · 2025 · Group 1

2025

Transcribed from the identified examination paper. Check the board, session and course before use. SchoolOrbit is not affiliated with the issuing board.

Objective

Printed marks: 17 · Time: 20 Min.

OBJECTIVE

Q1(1)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Chlorine heptaoxide $(C l_{2} O_{7})$ reacts with water to form:
- (A)
  Hypochlorous acid
- (B)
  Chloric acid
- (C)
  Perchloric acid
- (D)
  Chlorine and oxygen
Q1(2)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Which of the following acid can be used as a catalyst in Friedel-Crafts reactions:
- (A)
  $A l C l_{3}$
- (B)
  $H N O_{3}$
- (C)
  $H_{2} S O_{4}$
- (D)
  $H C l$
Q1(3)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
The fibre which is made from acrylonitrile as monomer:
- (A)
  PVC
- (B)
  Rayon fibre
- (C)
  Acrylic fibre
- (D)
  Polyester fibre
Q1(4)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Ozone layer is found in:
- (A)
  Troposphere
- (B)
  Stratosphere
- (C)
  Hydrosphere
- (D)
  Lithosphere
Q1(5)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Mark the correct statement:
- (A)
  $N a^{+}$ is smaller than $N a$ atom
- (B)
  $N a^{+}$ is larger than $N a$ atom
- (C)
  $C l^{-}$ is smaller than $C l$ atom
- (D)
  $C l^{-}$ and $C l$ atom are equal in size
Q1(6)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Cannizzaro’s reaction is not given by:
- (A)
  Formaldehyde
- (B)
  Acetaldehyde
- (C)
  Benzaldehyde
- (D)
  Trimethyl acetaldehyde
Q1(7)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Boric acid cannot be used:
- (A)
  As antiseptic in medicine
- (B)
  For washing eyes
- (C)
  in soda bottles
- (D)
  For enamels and glazes
Q1(8)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Which compound will have maximum repulsion with $H_{2} O$ :
- (A)
  $C_{6} H_{6}$
- (B)
  $C_{2} H_{5} O H$
- (C)
  $C H_{3} C H_{2} C H_{2} O H$
- (D)
  $C H_{3} - O - C H_{3}$
Q1(9)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Ecosystem is a smaller unit of:
- (A)
  Lithosphere
- (B)
  Hydrosphere
- (C)
  Atmosphere
- (D)
  Biosphere
Q1(10)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
The state of hybridization of carbon atom in methane is:
- (A)
  $s p^{3}$
- (B)
  $s p^{2}$
- (C)
  $s p$
- (D)
  $d s p^{2}$
Q1(11)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Which ion will have maximum value of heat of hydration:
- (A)
  $N a^{+}$
- (B)
  $C s^{+ 2}$
- (C)
  $B a^{+ 2}$
- (D)
  $M g^{+ 2}$
Q1(12)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Formula of chloroform is:
- (A)
  $C H_{3} C l$
- (B)
  $C C l_{4}$
- (C)
  $C H_{2} C l_{2}$
- (D)
  $C H C l_{3}$
Q1(13)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
The strength of binding energy of transition elements depends upon:
- (A)
  Number of electron pairs
- (B)
  Number of unpaired electrons
- (C)
  Number of neutrons
- (D)
  Number of protons
Q1(14)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Elimination bimolecular reaction involves:
- (A)
  First order kinetics
- (B)
  Second order kinetics
- (C)
  Third order kinetics
- (D)
  Zero order kinetics
Q1(15)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
The brown gas formed, when metal reduce $H N O_{3}$ to:
- (A)
  $N_{2} O_{5}$
- (B)
  $N_{2} O_{3}$
- (C)
  $N O$
- (D)
  $N O_{2}$
Q1(16)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
A carboxylic acid contains:
- (A)
  A hydroxyl group
- (B)
  A carboxyl group
- (C)
  A hydroxyl and carboxyl group
- (D)
  A carboxyl and an aldehydic group
Q1(17)
Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
Which three elements are needed for the healthy growth of plants:
- (A)
  $N, S, P$
- (B)
  $N, C a, P$
- (C)
  $N, P, K$
- (D)
  $N, K, C$

Subjective

Printed marks: 68 · Time: 2.40 hrs.

SECTION-I

2
Write short answers to any EIGHT (8) questions:
Q2(i)
Metallic character increases from top to bottom, justify.
Q2(ii)
The oxidation state of noble gas is usually zero, give reason.
Q2(iii)
Why $2 %$ gypsum is added in cement?
Q2(iv)
Alkali metals are among the most reactive elements of the periodic table, give reason.
Q2(v)
Define vital force theory, how it was rejected?
Q2(vi)
What is natural gas? Write its two uses.
Q2(vii)
Alkanes are less reactive than alkenes, justify.
Q2(viii)
Write any two uses of methane.
Q2(ix)
Write structure of anthracene and biphenyl.
Q2(x)
Define aromatic hydrocarbon with one example.
Q2(xi)
Prepare propanoic acid using Grignard reagent.
Q2(xii)
$S_{N} 2$ reactions are 2nd order reactions, justify.
3
Write short answers to any EIGHT (8) questions:
Q3(i)
What is Chemical Garden?
Q3(ii)
Write down four uses of Al.
Q3(iii)
What is Aqua Regia, give one example?
Q3(iv)
Write down two dissimilarities of oxygen with sulphur.
Q3(v)
What is absolute alcohol, and how it can be obtained?
Q3(vi)
Write down reaction of phenol with formaldehyde in the presence of alkali.
Q3(vii)
Write down two methods for the preparation of acetaldehyde.
Q3(viii)
What is silver mirror test?
Q3(ix)
Write down the flavours of amyl butyrate and isobutyl formate esters.
Q3(x)
Write down the reaction of acetic acid with ammonia.
Q3(xi)
What is condensation polymerization, give one example?
Q3(xii)
What are acrylic resins, give one example?
4
Write short answers to any SIX (6) questions:
Q4(i)
How municipal solid waste is incinerated? Discuss briefly.
Q4(ii)
What are chloramines? How are these formed?
Q4(iii)
Livestock waste is polluting water. Discuss.
Q4(iv)
Give the significance of ammonia fertilizer.
Q4(v)
Discuss the reactions taking place between 1 to 7 days during setting of cement.
Q4(vi)
Briefly discuss the colour chemistry in transition element compounds.
Q4(vii)
Give the formulae of: (a) Magnetite. (b) Haematite.
Q4(viii)
Give peculiar behaviour of fluorine.
Q4(ix)
Give formulae of: (a) Cryolite (b) Halite

SECTION-II

Note: Attempt any THREE questions.

Q5
(8 marks)
1. (a)
  How do you justify the position of hydrogen at the top of group IA and VII A?
  (4 marks)
2. (b)
  Describe with diagram the manufacture of sodium by Down’s cell. Point out the three advantages of this process.
  (4 marks)
Q6
(8 marks)
1. (a)
  Write down chain isomerism and functional group isomerism along with two examples each.
  (4 marks)
2. (b)
  What are ortho para directing groups and meta-directing groups, give one example in each case?
  (4 marks)
Q7
(8 marks)
1. (a)
  How will you bring about the following conversions: (i) 1-Butene to 1-Butyne (ii) 1-Propanol to $C H_{3} - C H_{2} - C H_{2} - C l$
  (2,2)
2. (b)
  Write a note on haloform reactions. Give the significance of iodoform test.
  (4 marks)
Q8
(8 marks)
1. (a)
  Discuss Lucas test by giving suitable examples.
  (4 marks)
2. (b)
  How will you prepare acetic acid by using: (i) Methyl magnesium bromide. (ii) Ethyl acetate.
  (4 marks)
Q9
(8 marks)
1. (a)
  Give eight uses of Noble gases.
  (4 marks)
2. (b)
  Discuss rules for naming the complex compound of transition element by giving the examples.
  (4 marks)

Original source references (2)

The original files and numbering are retained. Equivalent files do not repeat the questions above.

Objective · psp_70a7783073eaf5031a3af66cc9a195fe · Printed marks: 17 · Time: 20 Min.
Subjective · psp_313363aa161e6d61b73b14c779ef0538 · Printed marks: 68 · Time: 2.40 hrs.