XII Chemistry Half Yearly Exam Paper 2023-2024 (PDF)

ODISHA ADARSHA VIDYALAYA SANGATHAN HALF YEARLY EXAMINATION, 2023-24 Class: XII Maximum Mark:70 Subject: Chemistry (043) Time: 3 Hrs...

ODISHA ADARSHA VIDYALAYA SANGATHAN HALF YEARLY EXAMINATION, 2023-24 Class: XII Maximum Mark:70 Subject: Chemistry (043) Time: 3 Hrs General Instructions: Read the following instructions carefully. 1. There are 33 questions in this question paper with internal choice. 2. SECTION A consists of 16 multiple-choice questions carrying 1 mark each. 3. SECTION B consists of 5 very short answer questions carrying 2 marks each. 4. SECTION C consists of 7 short answer questions carrying 3 marks each. 5. SECTION D consists of 2 case- based questions carrying 4 marks each. 6. SECTION E consists of 3 long answer questions carrying 5 marks each. 7. All questions are compulsory. 8. Use of log tables and calculators is not allowed SECTION A The following questions are multiple-choice questions with one correct answer. Each question carries 1 mark. There is no internal choice in this section. 1. The conversion of an alkyl halide into alcohol by aqueous NaOH is classified as (a) adehydrohalogenation reaction (b) a substitution reaction (c) an addition reaction (d) a dehydration reaction 2. An organic compound X with molecular formula C3H8O on reaction with copper based catalyst gives compound Y which reduces Tollen’s reagent. The compound X can be (a) propanol (b) propan-2-ol (c) propanal (d) methoxyethane 3.The quantity of charge required to obtain one mole of aluminium from Al2O3 is------ (a) 1F b) 6F c) 3F d) 2F 4.Which of the following is correct for spontaneity of a cell ? (a) ΔG= -ve , E0= +ve (b) ΔG= +ve , E0= 0 (c) ΔG= -ve, E0= 0 (d) ΔG= +ve , E0= -ve 5. Hinsberg’s reagent which is used to test amines is (a) Benzene sulphonamide (b) Benzenediazonium chloride (c) Benzenesulphonyl chloride (d) Acetanilide 6. Which of the following statement is not correct about an inert electrode in a cell? (a) it does not participate in cell reaction (b) it provides surface either for oxidation or for reduction reaction (c) it provides surface for conduction of electrons (d) it provides surface for redox reaction. 7. Arrange the following in the increasing order of their boiling points: Page 1 of 5  A :Butanamine, B: N,N-Dimethylethanamine, C: N- Ethylethanamine (a) C< B