HSC 2025 Chemistry 1st Paper MCQ Question Chattogram Board English Version
Higher Secondary School Certificate (HSC)
Chattogram Board | Multiple Choice Examination
Chemistry 1st Paper
[According to the Syllabus of 2025]
Time—25 Minutes | Subject Code: 176
Full Marks—25 | Set: A
[Note: Fill up completely with a ballpoint pen the circle containing the letter corresponding to the correct/best answer against the serial number of the question in the supplied multiple-choice test answer sheet. Each question carries 1 mark. Answer all questions.]
No marks or signs of any kind can be made on the question paper.
- Which of the following is used to detect counterfeit money?
(A) Cosmic ray
(B) Gamma ray
(C) X-ray
(D) Ultraviolet ray - Which one has higher polarizing power?
(A) Mg²⁺
(B) Ca²⁺
(C) Sr²⁺
(D) Ba²⁺ - What is the pH of a 0.4% NaOH solution?
(A) 0
(B) 1
(C) 13
(D) 14 - Which one is an artificial food preservative?
(A) Sodium chloride
(B) Sodium benzoate
(C) Sugar
(D) Turmeric - Solubility product is—
i. Dependent on the temperature of the solution
ii. Applicable only to sparingly soluble electrolytes
iii. Applicable to both saturated and unsaturated solutions
Which of the following is correct?
(A) i and ii
(B) ii and iii
(C) i and iii
(D) i, ii and iii - Which ion forms a colored compound?
(A) Ni²⁺
(B) Zn²⁺
(C) Sc³⁺
(D) Cs⁺ - In the reaction A(g) + 3B(g) ⇌ 2D(g), what is the unit of Kₚ?
(A) atm
(B) atm⁻¹
(C) atm⁻²
(D) atm² - Which of the following is used to calculate the degree of dissociation of methanoic acid?
(A) √(c/Kₐ)
(B) Kₐ/c
(C) √(Kₐ × c)
(D) √(Kₐ/c) - Which enzyme is used in the hydrolysis of glucose during malt vinegar preparation?
(A) Invertase
(B) Maltase
(C) Zymase
(D) Diastase - Look at the table below:
Element Outermost Shell Electron Configuration
A ns²np²
D (n+1)s²
E (n+2)s²
X (n+1)s²(n+1)p⁵
(Here, n = 2)
According to the stem—
i. DX₂ is an ionic compound
ii. ECO₃ decomposes at high temperature
iii. Element A forms a covalent compound
Which of the following is correct?
(A) i and ii
(B) ii and iii
(C) i and iii
(D) i, ii and iii - If 120gm of a saturated NH₄Cl solution at 50°C temperature is cooled to 25°C, how many grams of NH₄Cl will crystallize? [The solubility of NH₄Cl at 50°C and 25°C is 60 and 40 respectively]
(A) 15
(B) 45
(C) 50
(D) 90 - How many internationally recognized principles of Green Chemistry are there?
(A) 10
(B) 11
(C) 12
(D) 13 - Which food preservative acts as an antimicrobial agent?
(A) Tocopherol
(B) Benzoic acid
(C) Vitamin-C
(D) BHT - For which substance does solubility increase with an increase in temperature?
(A) NaNO₃
(B) Ca(NO₃)₂
(C) Ca(OH)₂
(D) NaOH - If the solubility of Magnesium Phosphate is ‘S’, which one is its solubility product?
(A) S²
(B) 8S³
(C) 4S³
(D) 108S⁵ - What is the number of d-block elements?
(A) 14
(B) 27
(C) 36
(D) 41
Read the stem below and answer questions 17 and 18: AX₅(g) ⇌ AX₃(g) + X₂(g)
At 30°C temperature and 1 atm pressure, 75% of AX₅ dissociates at equilibrium to produce AX₃ and X₂. - What is the value of Kⲣ in atm?
(A) 3.07
(B) 3.00
(C) 2.32
(D) 1.28 - If X₂ is removed from the reaction, then—
i. The equilibrium state of the reaction will change
ii. The reaction will proceed in the forward direction
iii. The amount of AX₃ in the reaction will increase
Which of the following is correct?
(A) i and ii
(B) ii and iii
(C) i and iii
(D) i, ii and iii - What type of hybridization occurs in the central atom of the PCl₅ compound?
(A) sp²
(B) sp³
(C) sp³d
(D) sp³d² - Which oxide will be the most acidic?
(A) SO₃
(B) Cl₂O₇
(C) P₂O₅
(D) SiO₂ - Which set of quantum numbers is applicable for the last electron of Sulfur?
(A) n = 3, l = 0, m = 0, s = +1/2
(B) n = 3, l = 2, m = 1, s = +1/2
(C) n = 3, l = 1, m = 0, s = -1/2
(D) n = 3, l = 2, m = 0, s = -1/2 - Which proportionate mixture forms a buffer solution?
(A) CH₃COOH : NaOH = 2 : 1
(B) CH₃COOH : NH₄OH = 1 : 1
(C) NH₄OH : HCl = 1 : 1
(D) NH₄OH : H₂SO₄ = 2 : 1 - Reasons for food spoilage are—
i. Microbial attack
ii. Oxidation of food
iii. Effect of enzymes
Which of the following is correct?
(A) i and ii
(B) ii and iii
(C) i and iii
(D) i, ii and iii - Which is the formula for the electron holding capacity of any subshell of an element?
(A) 2(2l + 1)
(B) 2(l + 1)
(C) 2l + 1
(D) 2n² - What is the value of electronegativity of Chlorine on the Pauling scale?
(A) 2.1
(B) 2.5
(C) 3.0
(D) 4.0
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