BISE Multan · Class 12 · Chemistry

BISE Multan · Class 12 · Chemistry · 2025 · First Annual · Group 1

2025 · First Annual

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

Objective

Source code: 4481 · Printed marks: 17 · Time: 20 Minutes

OBJECTIVE

Q1(1)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which statement is incorrect?
- (A)
  All the metals are good conductors of electricity.
- (B)
  All the metals are good conductors of heat.
- (C)
  All the metals form positive ions.
- (D)
  All the metals form acidic oxides.
Q1(2)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
The mineral ( $C a S O_{4} .2 H_{2} O$ ) has the general name:
- (A)
  Gypsum
- (B)
  Dolomite
- (C)
  Calcite
- (D)
  Epsom salt
Q1(3)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Tincal is a mineral of:
- (A)
  $A l$
- (B)
  $B$
- (C)
  $S i$
- (D)
  $C$
Q1(4)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Laughing gas is chemically:
- (A)
  $N O$
- (B)
  $N O_{2}$
- (C)
  $N_{2} O$
- (D)
  $N_{2} O_{4}$
Q1(5)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which halogen occurs naturally in a positive oxidation state?
- (A)
  Fluorine
- (B)
  Chlorine
- (C)
  Bromine
- (D)
  Iodine
Q1(6)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Coordination number of $P t$ in $[P t C l (N O_{2}) (N H_{3})_{4}]$ is:
- (A)
  6
- (B)
  4
- (C)
  1
- (D)
  2
Q1(7)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
The chemist who synthesized urea from ammonium cyanate, was:
- (A)
  Berzelius
- (B)
  Kolbe
- (C)
  Wholer
- (D)
  Lavoisier
Q1(8)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Synthetic rubber is made by polymerization of:
- (A)
  Chloroform
- (B)
  Acetylene
- (C)
  Divinyl acetylene
- (D)
  Chloroprene
Q1(9)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which compound is most reactive one?
- (A)
  Ethane
- (B)
  Ethene
- (C)
  Ethyne
- (D)
  Benzene
Q1(10)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Elimination bimolecular reaction involves:
- (A)
  Second order kinetics
- (B)
  First order kinetics
- (C)
  Third order kinetics
- (D)
  Zero order kinetics
Q1(11)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Rectified spirit contains ethyl alcohol about:
- (A)
  80%
- (B)
  85%
- (C)
  90%
- (D)
  95%
Q1(12)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which will have highest boiling point?
- (A)
  Methanal
- (B)
  Ethanal
- (C)
  2-Hexanone
- (D)
  Propanal
Q1(13)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which acid is used in the manufacture of synthetic fibre?
- (A)
  Formic acid
- (B)
  Acetic acid
- (C)
  Oxalic acid
- (D)
  Carbonic acid
Q1(14)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which of these polymers is a synthetic polymer?
- (A)
  Animal fat
- (B)
  Starch
- (C)
  Cellulose
- (D)
  Polyester
Q1(15)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles 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)
  $N, K, C$
Q1(16)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Peroxyacetylnitrate(PAN) is an irritant to human beings and it affects:
- (A)
  Eyes
- (B)
  Ears
- (C)
  Stomach
- (D)
  Nose
Q1(17)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Fungicides are the pesticides which:
- (A)
  Kill insects
- (B)
  Control the growth of fungus
- (C)
  Kill plants
- (D)
  Kill herbs

Subjective

Printed marks: 68 · Time: 2.40 Hours

NOTE: Write same question number and its parts number on answer book, as given in the question paper.
NOTE: Attempt any three questions.

SECTION-I

2
Attempt any eight parts.
Q2(i)
Why the metallic character increases from top to bottom in group of Metals?
(2 marks)
Q2(ii)
How melting point and boiling point varied in periods?
(2 marks)
Q2(iii)
How Plaster of Paris is formed?
(2 marks)
Q2(iv)
Beryllium oxide is Amphoteric. Justify it by giving example.
(2 marks)
Q2(v)
What are heterocyclic compounds? Give two examples.
(2 marks)
Q2(vi)
What is Carbonization?
(2 marks)
Q2(vii)
What is Baeyer's Test and give its reaction?
(2 marks)
Q2(viii)
How alkanes are prepared from carbonyl compounds?
(2 marks)
Q2(ix)
Define resonance energy. Give resonance energy of benzene.
(2 marks)
Q2(x)
Write down general mechanism for halogenation of benzene.
(2 marks)
Q2(xi)
Why Grignard's reagent is more reactive compound?
(2 marks)
Q2(xii)
Convert ethyl bromide into n-butane.
(2 marks)
3
Attempt any eight parts.
Q3(i)
Give equations to represent the given reactions: (a) Borax is heated with $C o O$ (b) $A l_{2} O_{3}$ is heated with $N a O H$ solution
(2 marks)
Q3(ii)
Why are liquid silicones preferred over ordinary organic lubricants?
(2 marks)
Q3(iii)
Give the advantages of contact process for the manufacture of sulphuric acid.
(2 marks)
Q3(iv)
$P_{2} O_{5}$ is powerful dehydrating agent. Prove it by giving any one example.
(2 marks)
Q3(v)
What do you mean by denaturing of alcohol?
(2 marks)
Q3(vi)
Give chemical reaction for the preparation of Bakelite.
(2 marks)
Q3(vii)
Draw dimer of a carboxylic acid.
(2 marks)
Q3(viii)
What are fatty acids? Give two examples?
(2 marks)
Q3(ix)
Give four uses of formaldehyde.
(2 marks)
Q3(x)
How Acetal is formed?
(2 marks)
Q3(xi)
Define condensation polymerization. Give the reaction for the formation of polyester.
(2 marks)
Q3(xii)
Define epoxy resins. Give their importance/uses.
(2 marks)
4
Attempt any six parts.
Q4(i)
Write down any four peculiar behaviour of fluorine.
(2 marks)
Q4(ii)
What are Freons and Teflon?
(2 marks)
Q4(iii)
Differentiate between paramagnetic and diamagnetic substances.
(2 marks)
Q4(iv)
How does the electronic configuration of valence shell affect binding energy?
(2 marks)
Q4(v)
Write down any four essential qualities of a good fertilizer.
(2 marks)
Q4(vi)
Briefly describe pulp washing in neutral sulphite semi-chemical process.
(2 marks)
Q4(vii)
How is oil spillage affecting the marine life?
(2 marks)
Q4(viii)
What is acid rain? How does it affect our environment?
(2 marks)
Q4(ix)
Differentiate between primary and secondary pollutants.
(2 marks)

SECTION-II

NOTE: Attempt any three questions.

Q5
(8 marks)
1. (a)
  Define halides. Classify different types of halides with trends in periodic table.
  (4 marks)
2. (b)
  Discuss the peculiar behaviour of lithium with respect to other members of alkali metals (any eight).
  (4 marks)
Q6
(8 marks)
1. (a)
  Discuss catalytic cracking and steam cracking.
  (4 marks)
2. (b)
  Write down any four methods for the preparation of Benzene.
  (4 marks)
Q7
(8 marks)
1. (a)
  Write down structural formulas for the products that are formed when 1 - butene will react with the given reagents: (i) $H_{2}, P t$ (ii) $B r_{2}$ in $C C l_{4}$ (iii) $O_{2}$ in the presence of $A g$ (iv) $H O C l$
  (4 marks)
2. (b)
  How is iodoform prepared using the given as starting materials? (i) Acetaldehyde (ii) Acetone (iii) Secondary alcohol (iv) Ethanol
  (4 marks)
Q8
(8 marks)
1. (a)
  What is Lucas test? Give its significance by reaction equations.
  (1+3)
2. (b)
  How does $C H_{3} C O O H$ react with $P C l_{5}$ ? Also give its mechanism.
  (1+3)
Q9
(8 marks)
1. (a)
  Write any four applications of Noble gases.
  (4 marks)
2. (b)
  Describe Bessemer's Process briefly.
  (4 marks)

Original source references (5)

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

Objective · 4481 · Printed marks: 17 · Time: 20 Minutes
Objective · 4483 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4485 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4487 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Subjective · psp_b2d332319d0f5e89873e3ffe670cd529 · Printed marks: 68 · Time: 2.40 Hours