HSC 2025 Chemistry 1st Paper MCQ Question Dhaka Board English Version
Shamya | 186 | 1581/2025
Dhaka Board
Multiple Choice Examination
Chemistry – First Paper
[According to the Syllabus of 2025]
Time—25 minutes
Full Marks—25
Subject Code: 176 | Set: C
Special Note: Fill in the circle completely with a ballpoint pen corresponding to the correct/best answer against the serial number of the question in the provided multiple-choice answer sheet. Each question carries 1 mark.
No marks or signs can be made on the question paper.
- Two solutions with pH = 2 and pH = 4 are given. How many times more acidic is the first one compared to the second one?
(A) 10 times
(B) 100 times
(C) 1000 times
(D) 10000 times - What is the pH of a 0.001 M NaOH solution?
(A) 3
(B) 8
(C) 11
(D) 13 - H₂(g) + I₂(g) ⇌ 2HI(g); if Kₚ = 50.24 at 40°C, then Kc = ?
(A) 2.262
(B) 22.62
(C) 5.028
(D) 50.24 - What is the basicity of H₃BO₃?
(A) 1
(B) 2
(C) 3
(D) 4 - Which of the following is used to prevent the oxidation of lipids in food items?
(A) SO₂
(B) CH₃CHO
(C) CH₃COOH
(D) H₂SO₄ - In the production of malt vinegar, which enzyme influences the conversion of glucose and fructose into ethanol?
(A) Invertase
(B) Diastase
(C) Maltase
(D) Zymase - Which of the following is a natural food preservative?
i. Sodium chloride
ii. Sucrose
iii. Sorbic acid
Which one of the following is correct?
(A) i and ii
(B) i and iii
(C) ii and iii
(D) i, ii and iii - Which of the following is an antimicrobial agent?
(A) BHT
(B) TBHQ
(C) Sodium benzoate
(D) BHA - If the solubility of a salt at 30°C is 25, what is the amount of solute in 50g of its saturated solution?
(A) 5g
(B) 7g
(C) 10g
(D) 25g - Which of the following is an amphoteric oxide?
(A) SO₃
(B) ZnO
(C) CaO
(D) MgO - Which of the following is correct according to the decreasing order of acid strength?
(A) HClO₄ > H₂SO₄ > HNO₃ > H₂SO₃
(B) HClO₄ > H₂SO₄ > H₂SO₃ > HNO₃
(C) H₂SO₃ > HClO₄ > H₂SO₄ > HNO₃
(D) HNO₃ > HClO₄ > H₂SO₄ > H₂SO₃ - For which of the following species is the Bohr atomic model applicable?
(A) H⁺
(B) He²⁺
(C) Li³⁺
(D) He⁺ - Which pairs of atoms have the same number of electrons in their outermost energy level?
(A) He, C
(B) K, Na
(C) C, Mg
(D) O, N - Which of the following electromagnetic radiations has the longest wavelength?
(A) Ultraviolet
(B) Visible
(C) Infrared
(D) Gamma rays - Which one is Nessler’s reagent?
(A) Zn – Hg and concentrated HCl
(B) CuSO₄ + 2 NaOH
(C) K₂HgI₄ + KOH
(D) [Ag(NH₃)₂]OH - If the solubility of silver chromate is 0.00012 grams per liter of an aqueous solution, what is its solubility product (Kₛₚ)? [Atomic Mass: Ag-108, Cr-52]
(A) 1.89 × 10⁻¹⁹
(B) 1.75 × 10⁻²⁰
(C) 1.37 × 10⁻¹⁸
(D) 1.95 × 10⁻²¹
Read the stimulus below and answer questions 17 and 18:
| Group → Period ↓ | 1 | 3 | 7 | 12 |
|---|---|---|---|---|
| 4th | A | X | Y | Z |
- Which element in the stimulus forms colored compounds?
(A) Z
(B) Y
(C) X
(D) A - According to the stimulus—
i. A⁺ has no magnetic properties
ii. The compound formed by Z²⁺ is colorless
iii. Element Y exhibits variable oxidation states
Which one of the following is correct?
(A) i and ii
(B) i and iii
(C) ii and iii
(D) i, ii and iii - Which is the hybridization of the central atom in the BF₄⁻ ion?
(A) sp
(B) sp²
(C) sp³
(D) sp³d - Intramolecular hydrogen bonding is formed by—
i. ortho-nitrophenol
ii. ortho-nitrotoluene
iii. ortho-hydroxybenzaldehyde
Which one of the following is correct?
(A) i and ii
(B) i and iii
(C) ii and iii
(D) i, ii and iii - Which is the correct decreasing order of electronegativity?
(A) F > O > Cl
(B) I > Br > Cl
(C) F > Cl > O
(D) N > I > Br - Which one is a distinct characteristic of chemical equilibrium?
(A) Completion of the reaction
(B) Irreversibility of the reaction
(C) Necessity of a catalyst
(D) Stability of the equilibrium state - Which set of quantum numbers is correct for the outermost electron of Potassium (K)?
(A) n = 4, l = 2, m = +1, s = +½
(B) n = 3, l = 0, m = 0, s = -½
(C) n = 3, l = 1, m = 0, s = +½
(D) n = 4, l = 0, m = 0, s = +½ - Three elements P, Q, and R have atomic numbers 8, 12, and 20 respectively. According to this information—
i. P²⁺ and Q²⁺ do not show any color in the flame test
ii. The increasing order of polarizing power is R²⁺ > Q²⁺ > P²⁺
iii. The increasing order of thermal decomposition temperature is RCO₃ > QCO₃ > PCO₃
Which one of the following is correct?
(A) i and ii
(B) i and iii
(C) ii and iii
(D) i, ii and iii - Which buffer system is present in human blood?
(A) NaHCO₃ + H₂CO₃
(B) CH₃COONa + CH₃COOH
(C) NH₄Cl + NH₄OH
(D) Na₂HPO₄ + H₃PO₄
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