HSC 2025 Chemistry 1st Paper MCQ Question Rajshahi Board English Version
Higher Secondary School Certificate (HSC)
Rajshahi Board | Multiple Choice Examination
Chemistry 1st Paper
[According to the Syllabus of 2025]
Time—25 Minutes | Subject Code: 176
Full Marks—25 | Set: C
Note: Fill up the circle completely with a ballpoint pen corresponding to the correct/best answer against the serial number of the question in the supplied OMR answer sheet. Each question carries 1 mark. All questions must be answered.
No marks or signs can be made on the question paper.
- Which ray has the highest energy?
A) UV-ray
B) IR-ray
C) γ-ray
D) α-ray - What is the pH of a 1% (W/V) NaOH solution?
A) 13.39
B) 12.25
C) 1.00
D) 0.60 - What is the hybridization of the central ion in [Cu(NH₃)₄]SO₄?
A) sp³d
B) sp³d²
C) sp²d²
D) sp²d - Which of the following has an equal number of electrons and neutrons?
A) ¹⁹₉F⁻
B) ¹⁶₈O²⁻
C) ¹⁴₇N³⁻
D) ⁹₄Be - What types of bonds are present in PH₄⁺ ion?
A) Ionic and Covalent
B) Ionic and Coordinate
C) Covalent and Coordinate
D) Ionic and Hydrogen - At what temperature will Kₚ and K꜀ be equal to each other for the reaction PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)?
A) 0.1218 K
B) 0.1218°C
C) 12.18 K
D) 12.18°C - A + Fructose ⟶ Product + CO₂ (Catalyst produced from yeast)
In this reaction —
i. A is carbohydrate
ii. The catalyst is zymase
iii. The product is used as fuel
Which one of the following is correct?
A) i and ii
B) ii and iii
C) i and iii
D) i, ii and iii - Which ion can be identified using the reagent K₄[Fe(CN)₆]?
A) Cu²⁺
B) Al³⁺
C) Na⁺
D) NH₄⁺
Answer questions 9 and 10 based on the following stem:
Period \ Group 1 15 16 17
1 A
2 B X M
3 L Y
(Here the symbols are assumed, not real) - Which one has the minimum bond angle?
A) A₂Y
B) LA₃
C) BA₃
D) A₂X - For the YM₆ compound —
i. It is sp³d² hybridized
ii. It is octahedral
iii. The bond angle in it is 120°
Which one of the following is correct?
A) i and ii
B) ii and iii
C) i and iii
D) i, ii and iii - According to Ostwald’s dilution law, which one is correct for the degree of dissociation?
A) α ∝ C
B) α ∝ 1/√C
C) α ∝ 1/C
D) α ∝ C² - If the solubility product of Al₂(SO₄)₃ is 1.5 × 10⁻⁵, what is the molar concentration of SO₄²⁻?
A) 1.27 × 10⁻¹ M
B) 4.20 × 10⁻² M
C) 6.21 × 10⁻³ M
D) 6.02 × 10⁻³ M - Which is the equation for determining the pH of an acidic buffer solution?
A) pH = pKₐ – log [salt]/[base]
B) pH = pKₐ + log [salt]/[base]
C) pH = pKₐ – log [salt]/[acid]
D) pH = pKₐ + log [salt]/[acid] - The Bohr atomic model can explain —
i. The spectrum of Be²⁺ ion
ii. The energy absorption and emission of transitioning electrons
iii. The stability of the atom
Which one of the following is correct?
A) ii
B) ii and iii
C) i and iii
D) i, ii and iii - Which one is a weak ligand?
A) NH₃
B) F⁻
C) CO
D) CN⁻ - What is the angular momentum of the last electron of potassium?
A) 3.42 × 10⁻³² JS
B) 4.22 × 10⁻³⁴ JS
C) 3.64 × 10⁻²⁷ JS
D) 4.22 × 10⁻²⁸ JS - From which pair of solutions can an alkaline buffer solution be prepared?
i. HCOOH + NH₄OH
ii. HNO₃ + NH₄OH
iii. HCOOH + KOH
Which one of the following is correct?
A) i
B) i and ii
C) ii and iii
D) i, ii and iii - Which is the correct order of electron affinity?
A) S > O > Se > Te > Po
B) Se > Te > Po > O > S
C) O > S > Se > Te > Po
D) S > Se > Te > Po > O - Which one is an antioxidant?
A) C₆H₈O₂
B) EDTA
C) TBHQ
D) K₂S₂O₅ - Which one has a greater ability to polarize?
A) Ca²⁺
B) Ba²⁺
C) Al³⁺
D) Fe³⁺ - Which one is vinegar?
A) 96.4% aqueous solution of CH₃CH₂OH
B) 4.6% aqueous solution of HCOOH
C) 6—10% aqueous solution of CH₃COOH
D) 40% aqueous solution of HCHO - Which salt exhibits an anomalous effect of temperature on its solubility in water?
A) Na₂SO₄·10H₂O
B) KNO₃
C) NaCl
D) CuSO₄·5H₂O - Regarding the reaction A₂(g) + 3B₂(g) ⇌ 2AB₃(g) —
i. If pressure is increased, the yield will increase
ii. If A₂ is added, the yield will increase
iii. Kₚ and K꜀ will be equal
Which one of the following is correct?
A) i
B) i and ii
C) ii and iii
D) i, ii and iii - Which is the correct set of four quantum numbers for the 22nd electron of Fe?
A) n = 3, l = 2, m = -1, s = +1/2
B) n = 3, l = 1, m = -1, s = +1/2
C) n = 3, l = 2, m = -2, s = -1/2
D) n = 3, l = 1, m = -2, s = -1/2 - Which one is a diamagnetic metal?
A) Fe
B) Co
C) Ni
D) Zn
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