HSC 2026 Chemistry 1st Paper MCQ Solution - English Version (All Boards)
Introduction: Welcome to all HSC 2026 examinees! We have brought you the 100% accurate MCQ solution for your Chemistry 1st Paper (English Version) exam. After the exam, many of you want to verify your answers. To help you out, we have collected the question paper from all boards and prepared this solution with the help of experienced teachers. Check your answers from below, and if you need, you can also download the complete PDF solution from the bottom of this page.
1. Which orbital has its lobe along the axis?
(a) dxy and dyz
(b) dz2 and dx2-y2
(c) dzx and dx2-y2
(d) dz2 and dyz
✓ Answer: (b) dz2 and dx2-y2
2. Which set of quantum numbers is correct of the following?
(a) n = 4, l = 0, m = +1, s = +½
(b) n = 4, l = 3, m = +3, s = +½
(c) n = 4, l = 4, m = 0, s = +½
(d) n = 4, l = 2, m = -3, s = +½
✓ Answer: (b) n = 4, l = 3, m = +3, s = +½
3. How active will a buffer solution as its pH and PKa value get closer?
(a) Very slightly active
(b) Slightly active
(c) More active
(d) Activity will be zero
✓ Answer: (c) More active
Observe the stem and answer question no. 4 and 5 :
At 25°C, water solubility of QR2 is 0.08 mol/L and heat is absorbed when QR2 dissolves in water.
4. What is the concentration of R- in the stem's solution?
(a) 0.16 mol/L
(b) 0.08 mol/L
(c) 0.0064 mol/L
(d) 0.8 mol/L
✓ Answer: (a) 0.16 mol/L
5. For the solution of the stem—
i. Ksp is 2.048 × 10-3
ii. solubility increases with increasing temperature
iii. the concentration of Q2+ will be 0.0064 mol/L
Which one is correct?
(a) i and ii
(b) i and iii
(c) ii and iii
(d) i, ii and iii
✓ Answer: (a) i and ii
6. What is the mass of sample used in semi-micro analysis?
(a) 0.5g — 2g
(b) 0.05g — 0.2g
(c) 0.005g — 0.02g
(d) 1g — 2g
✓ Answer: (b) 0.05g — 0.2g
7. Which compound of the following has highest bond angle?
(a) CH4
(b) CO2
(c) NH3
(d) H2O
✓ Answer: (b) CO2
8. Which reagent of the following is used in identifying Ca2+?
(a) (NH4)2C2O4
(b) K2H2Sb2O7
(c) KOH + K2[HgI4]
(d) K4[Fe(CN)6]
✓ Answer: (a) (NH4)2C2O4
9. Which animal's milk contains maximum protein?
(a) Camel
(b) Goat
(c) Sheep
(d) Buffalo
✓ Answer: (c) Sheep
10. Which one is a dehydrating agent?
(a) N2O5
(b) P2O5
(c) V2O5
(d) Cl2O5
✓ Answer: (b) P2O5
11. Which one is not a preservative?
(a) CH3COOH
(b) C2H5OH
(c) HCHO
(d) CH3OH
✓ Answer: (d) CH3OH
12. If the solubility of compound A2B3 is x mol/L, what is its Ksp?
(a) 4x3
(b) 27x4
(c) 108x5
(d) 256x6
✓ Answer: (c) 108x5
13. Which one is the correct order of increasing ionization energy?
(a) Na < K < Rb
(b) F < Cl < Br
(c) C < N < O
(d) C < O < N
✓ Answer: (d) C < O < N
Observe the stem and answer question no. 14 and 15 :
0.05M 'R' is a monobasic organic acid which Ka = 1.8 × 10-5 and MOH is a base where M is an alkali metal.
14. What is the pH of R solution?
(a) 3.02
(b) 4.02
(c) 5.02
(d) 6.02
✓ Answer: (a) 3.02
15. R and MOH solutions —
i. equimolar mixture is a buffer solution
ii. neutralization enthalpy is less than the constant temperature
iii. Ostwald's law is applicable for 'R' solution
Which one is correct?
(a) i and ii
(b) i and iii
(c) ii and iii
(d) i, ii and iii
✓ Answer: (c) ii and iii
16. Which one is most effective coagulant?
(a) K2SO4
(b) Na2SO4
(c) FeSO4
(d) Fe2(SO4)3
✓ Answer: (d) Fe2(SO4)3
17. In which compound maximum polarization occurs?
(a) Na2O
(b) K2O
(c) CaO
(d) MgO
✓ Answer: (d) MgO
18. Which one is the correct order for acid strength?
(a) H2SO4 > HClO4 > H3PO4
(b) H3PO4 > H2SO4 > HClO4
(c) HClO4 > H2SO4 > H3PO4
(d) H2SO4 > H3PO4 > HClO4
✓ Answer: (c) HClO4 > H2SO4 > H3PO4
19. In Paul Bunge balance for 20 mg rider, what is the value of rider constant?
(a) 0.0002g
(b) 0.0004g
(c) 0.0001g
(d) 0.04g
✓ Answer: (b) 0.0004g
20. What is the value of n2 for the second line of Lyman series?
(a) 1
(b) 2
(c) 3
(d) 4
✓ Answer: (c) 3
21. Which hybridization occurs in S of SO3 compound?
(a) sp
(b) sp2
(c) sp3
(d) dsp2
✓ Answer: (b) sp2
22. 2AB2 + B2 ↔ 2AB3 + heat
If Kp = M in this equilibrium, what is the value of Kc?
(a) MRT
(b) M / RT
(c) RT / M
(d) MT / R
✓ Answer: (a) MRT
Answer question number 23 and 24 according to the following stem :
(A periodic table chart where 'X' is in Period 2nd, Group 15 and 'Y' is in Period 3rd, Group 17)
23. Which oxide of X is most acidic?
(a) X2O
(b) X2O3
(c) X2O4
(d) X2O5
✓ Answer: (d) X2O5
24. Correct information about 'X' and 'Y' are—
i. Y has highest electron affinity
ii. XY5 doesn't form
iii. sp3 hybridization occurs in 'X' of XY3
Which one is correct?
(a) i and ii
(b) i and iii
(c) ii and iii
(d) i, ii and iii
✓ Answer: (d) i, ii and iii
25. Neutralization enthalpy value is -57.34 KJ mol-1
2NaOH(aq) + H2SO4(aq) ↔ Na2SO4(aq) + 2H2O(l)
What is the heat of neutralization reaction?
(a) -114.68 KJ
(b) -86.01 KJ
(c) -57.34 KJ
(d) -28.67 KJ
✓ Answer: (a) -114.68 KJ
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