BISE Multan · Class 12 · Chemistry

BISE Multan · Class 12 · Chemistry · 2025 · First Annual · Group 2

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: 4482 · 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.
Mark the correct option/statement:
- (A)
  $C l^{-}$ (ion) and $C l$ (atom) are equal in size
- (B)
  $N a^{+}$ is larger than $N a$ atom
- (C)
  $C l^{-}$ is smaller than $C l$ atom
- (D)
  $N a^{+}$ is smaller than $N a$ atom
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.
Which element is deposited at the cathode during the electrolysis of brine in diaphragm cell?
- (A)
  $H_{2}$
- (B)
  $N a$
- (C)
  $C l_{2}$
- (D)
  $O_{2}$
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.
Boric acid cannot be used:
- (A)
  An antiseptic in medicine
- (B)
  For washing eyes
- (C)
  In soda bottles
- (D)
  For enamels and glazes
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)
  $N_{2} O$
- (C)
  $N O_{2}$
- (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.
Hydrogen bond is the strongest between the molecules of:
- (A)
  $H I$
- (B)
  $H C l$
- (C)
  $H B r$
- (D)
  $H F$
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.
Group $\overline{V I} B$ of transition elements contains:
- (A)
  $Z n, C d, H g$
- (B)
  $F e, R u, O s$
- (C)
  $C r, M o, W$
- (D)
  $M n, T e, R e$
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.
Linear shape is associated with which set of hybrid orbitals?
- (A)
  $s p$
- (B)
  $s p^{2}$
- (C)
  $s p^{3}$
- (D)
  $d s p^{2}$
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.
Vinyl acetylene combines with $H C l$ to form:
- (A)
  Polyacetylene
- (B)
  Benzene
- (C)
  Chloroprene
- (D)
  Divinyl acetylene
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.
The electrophile in aromatic sulphonation is:
- (A)
  $S O_{3}$
- (B)
  $H_{2} S O_{4}$
- (C)
  $S O_{3}^{+}$
- (D)
  $H S O_{4}^{-}$
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.
For which mechanisms, the first step involved is the same:
- (A)
  $E 1$ and $E 2$
- (B)
  $E 1$ and $S_{N} 1$
- (C)
  $S_{N} 1$ and $E 2$
- (D)
  $E 2$ and $S_{N} 2$
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.
Which compound is called a universal solvent?
- (A)
  $H_{2} O$
- (B)
  $C H_{3} O H$
- (C)
  $C_{2} H_{5} O H$
- (D)
  $C H_{3} - O - C H_{3}$
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 of the given compounds will not give iodoform test?
- (A)
  Acetaldehyde
- (B)
  Acetone
- (C)
  Butanone
- (D)
  3-pentanone
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.
Acetamide is prepared by:
- (A)
  Heating ethyl acetate
- (B)
  Heating methyl cyanide
- (C)
  Heating ammonium acetate
- (D)
  Hydrolysis of methyl cyanide
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 an addition polymer?
- (A)
  Nylon 6, 6
- (B)
  Polystyrene
- (C)
  Terylene
- (D)
  Epoxy resin
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.
Micro-nutrients are required in quantity ranging from:
- (A)
  6-200 g
- (B)
  4-40 g
- (C)
  6-200 kg
- (D)
  4-40 kg
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.
Newspaper can be recycled again and again by how many times?
- (A)
  2
- (B)
  3
- (C)
  5
- (D)
  4
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.
The $p H$ range of the acid rain is:
- (A)
  7-6.5
- (B)
  6.5-6
- (C)
  6-5.6
- (D)
  Less than 5

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)
What is Lanthanide Contraction?
(2 marks)
Q2(ii)
Define hydration energy of ions with an example.
(2 marks)
Q2(iii)
Why lime is added to acidic soil?
(2 marks)
Q2(iv)
Why 2% Gypsum is added to cement?
(2 marks)
Q2(v)
Define Meta directing group with example.
(2 marks)
Q2(vi)
Define Metamerism. Give an example.
(2 marks)
Q2(vii)
What is octane number? How is it improved?
(2 marks)
Q2(viii)
How will you prepare acetone from propyne?
(2 marks)
Q2(ix)
How ethyne is converted into benzene?
(2 marks)
Q2(x)
How Maleic acid is prepared from benzene?
(2 marks)
Q2(xi)
What is Wurtz synthesis? Give reaction.
(2 marks)
Q2(xii)
Write down the main factors on which reactivity of alkyl halide depends.
(2 marks)
3
Attempt any eight parts.
Q3(i)
How will you convert boric acid into borax and borax into boric acid?
(2 marks)
Q3(ii)
Give the four names and formulas of different acids of boron.
(2 marks)
Q3(iii)
Why is $S O_{3}$ dissolved in $H_{2} S O_{4}$ , not in water?
(2 marks)
Q3(iv)
Write any four uses of $H N O_{3}$ .
(2 marks)
Q3(v)
Write down formulas of (a) Picric acid (b) Methoxy benzene
(2 marks)
Q3(vi)
Show reactions to prepare ethers by Williamson's synthesis.
(2 marks)
Q3(vii)
Define amino acids. Give two examples.
(2 marks)
Q3(viii)
What is glacial acetic acid?
(2 marks)
Q3(ix)
Give general mechanism of acid catalysed addition reactions for aldehydes.
(2 marks)
Q3(x)
What is sodium nitroprusside test?
(2 marks)
Q3(xi)
Define Saponification number and iodine number.
(2 marks)
Q3(xii)
What is acid number?
(2 marks)
4
Attempt any six parts.
Q4(i)
Why $H F$ is weaker acid than $H C l$ ? Justify.
(2 marks)
Q4(ii)
Write down four peculiar behaviour of fluorine.
(2 marks)
Q4(iii)
How chromate ions are converted into dichromate ions?
(2 marks)
Q4(iv)
Why does damaged tin plated iron get rusted quickly?
(2 marks)
Q4(v)
What are macronutrients? Name any four macronutrients.
(2 marks)
Q4(vi)
Briefly describe pulp washing in neutral sulphite semi-chemical process.
(2 marks)
Q4(vii)
Name the components of environment. Briefly describe any one.
(2 marks)
Q4(viii)
What is acid rain? How does it affect our environment?
(2 marks)
Q4(ix)
Briefly describe incineration of Municipal Solid Waste.
(2 marks)

SECTION-II

NOTE: Attempt any three questions.

Q5
(8 marks)
1. (a)
  What are the oxides? Describe their classification on the basis of their acidic and basic behaviour.
  (1+3)
2. (b)
  Describe with diagram the manufacturing of caustic soda by diaphragm cell.
  (1+3)
Q6
(8 marks)
1. (a)
  What is orbital hybridization? Explain $s p^{3}$ Hybridization in Methane molecule.
  (4 marks)
2. (b)
  Define Alkylation, give one example and explain mechanism of reaction.
  (4 marks)
Q7
(8 marks)
1. (a)
  How will you prepare sodium formate and sodium benzoate through Cannizzaro's reaction? Give mechanisms.
  (4 marks)
2. (b)
  How will you synthesize the following compounds starting from ethyne? (i) Oxalic acid (ii) Ethane (iii) Methylnitrile (iv) Benzene
  (4 marks)
Q8
(8 marks)
1. (a)
  How ethanol is prepared by fermentation method from molasses and from starch? Explain it.
  (2+2)
2. (b)
  How will you prepare acetic acid by using the following: (i) From alkane nitriles (ii) By the hydrolysis of esters
  (2+2)
Q9
(8 marks)
1. (a)
  Write Beckmann's method for the manufacturing of Bleaching Powder.
  (4 marks)
2. (b)
  Describe open hearth process briefly.
  (4 marks)

Original source references (5)

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

Objective · 4482 · Printed marks: 17 · Time: 20 Minutes
Objective · 4484 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4486 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4488 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Subjective · psp_c8024fe04724049c88a5ab298013d466 · Printed marks: 68 · Time: 2.40 Hours