HBSE Class 11 Chemistry Half Yearly Question Paper 2023 Answer Key

Haryana Board (HBSE) Class 11 Chemistry Half Yearly Question Paper 2023 Answer Key. Haryana Board Class 11th Half Yearly Question Paper Pdf Download 2023. Haryana Board Class 11th Half Yearly Question Paper Solution 2023. HBSE Class 11th Half Yearly 2023 Paper. HBSE Chemistry Half Yearly Question Paper 2023 Answer Key.

HBSE Class 11 Chemistry Half Yearly Question Paper 2023 Answer Key

Instructions :
• All questions are compulsory.
• Questions (1-15) carry 1 mark each.
• Questions (16-18) carry 2 marks each.
• Questions (19-21) carry 3 marks each.
• Questions (22-23) carry 5 marks each.

1. How many significant figures are there in 0.0036?
(a) 2
(b) 3
(c) 4
(d) 5
Answer – (a) 2

2. Which of the following is isoelectronic with CO?
(a) NO
(b) SnCl₂
(c) N₂
(d) NO₂
Answer – (c) N₂

3. Enthalpy of Reaction in a endothermic process is :
(a) Positive
(b) Negative
(c) Zero
(d) None of these
Answer – (a) Positive

4. Temperature at which Celsius and Fehrenheit scale give the same reading :
(a) 40°C
(b) -40°C
(c) 27°C
(d) None of above
Answer – (d) -40°C
F = (9/5)×C + 32

5. Which element has most negative electron gain enthalpy?
(a) F
(b) Br
(c) Cl
(d) I
Answer – (c) Cl (chlorine)

6. Which of the following pairs has diagonal relationship?
(a) Be and Al
(b) Be and Mg
(c) Li and Na
(d) B and Al
Answer – (a) Be (beryllium) and Al (aluminium)

7. Which of the following molecules has pyramidal shape?
(a) NH₃
(b) PCI₅
(c) H₂O
(d) SF₆
Answer – (a) NH₃

8. Which type of intermolecular forces of attraction exist among H₂O molecules?
(a) Vander Waal force
(b) Hydrogen bonding
(c) Dipole dipole interaction
(d) None of these
Answer – (b) Hydrogen bonding

9. What is the mass of 0.1 mole of glucose (C₆H₁₂O₆)
(a) 18 g
(b) 1.8 g
(c) 108 g
(d) 180 g
Answer – (a) 18 g
Molar Mass = 6×12 + 12×1 + 6×16 = 72 + 12 + 96 = 180 g/mol

10. What is hybridisation of B in BF₃ molecule?
(A) SP
(B) SP²
(C) SP³
(D) SP³d²
Answer – (B) SP²

11. Write formula for conjugate base of HCO^3–.
Answer : CO₃^2–

12. What is the value for compressibility factor for ideal gas?
Answer : Z = 1

13. Write expression for equilibrium constant for the following reaction :
N₂ + 3H₂ ⇌ 2NH₃
Answer : K = [NH₃]² / [N₂][H₂]³

14. Name the type of system in which neither matter nor energy is exchanged with surroundings.
Answer – Isolated system

15. What is general electronic configuration for p block elements?
Answer : ns²np^1–6

16.