HBSE Class 11 Chemistry Half Yearly Question Paper 2022 Answer Key

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HBSE Class 11 Chemistry Half Yearly Question Paper 2022 Answer Key

विद्यार्थी का नाम ………. रोल नंबर ……….
अर्धवार्षिक आकलन – सितम्बर 2022
कक्षा – 11
विषय – Chemistry
समय : 90 मिनट        कुल अंक : 40

निर्देश : 1. सभी प्रश्न अनिवार्य हैं।
2. प्रश्न संख्या 1 से 15 तक प्रत्येक प्रश्न 1 अंक का है। प्रश्न संख्या 16 से 18 तक प्रत्येक प्रश्न 2 अंक, प्रश्न संख्या 19 से 21 तक प्रत्येक प्रश्न 3 अंक तथा प्रश्न संख्या 22 से 23 तक प्रत्येक प्रश्न 5 अंक का है।
Instructions : 1. All questions are compulsory.
2. Question numbers 1 to 15 carry 1 mark each, question numbers 16 to 18 carry 2 marks each, question numbers 19 to 21 carry 3 marks each and question number 22 to 23 carry 5 marks each.

(1-10) Mark (✓) on the correct answer.
Q1. How many significant figures are there in 0.0036 ?
(A) 2
(B) 3
(C) 4
(D) 5
Answer – (A) 2

Q2. Which of the following is isoelectronic with CO ?
(A) NO
(B) SnCl2
(C) N2
(D) NO2
Answer – (C) N2

Q3. Enthalpy of Reaction in a endothermic process is
(A) Positive
(B) Negative
(C) Zero
(D) None of these
Answer – (A) Positive

Q4. 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 – (B) -40°C
F = (9/5)×C + 32

Q5. Which element has most negative electron gain enthalpy ?
(A) F
(B) Br
(C) Cl
(D) I
Answer – (C) Cl (chlorine)

Q6. 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)

Q7. Which of the following molecules has pyramidal shape ?
(A) NH3
(B) PCI5
(C) H2O
(D) SF6
Answer – (A) NH3

Q8. Which type of intermolecular forces of attraction exist among H2Omolecules ?
(A) Vander Waal force
(B) Hydrogen bonding
(C) Dipole dipole interaction
(D) None of these
Answer – (B) Hydrogen bonding

09. 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

Q10. What is hybridisation of B in BF3 molecule ?
(A) SP
(B) SP²
(C) SP³
(D) SP³d²
Answer – (B) SP²

(11-15) Write answer of following questions in 1-2 sentences.
Q11. Write formula for conjugate base of HCO3-.
Answer: CO3²-

Q12. What is the value for compressibility factor for ideal gas ?
Answer: z = 1

Q13. Write expression for equilibrium constant for the following reaction
N2 + 3H2 ⇌ 2NH3
Answer: K = [NH3]² ÷ [N2][H2

Q14. Name the type of system in which neither matter nor energy is exchanged with surroundings.
Answer – isolated system

Q15. What is general electronic configuration for p block elements ?
Answer: ns² np¹-⁶

(16-18) इन प्रश्नों के उत्तर 20-30 शब्दों में लिखे।
Write answer in 20-30 words.


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