SureVin International School
HALF YEARLY EXAMINATION 2023-24
CLASS – XIIth A
Time : 3 Hrs Subject – Chemistry (043) M.M : 70
General Instruction
Read the following instructions carefully
There are 33 questions in this question paper. All questions are compulsory.
Section A:Q. No. 1 to l6 are objective type questions. Each question carry 1 mark
each.
Section B:Q. No. 17 to 21 are very short answer questions and carry 2 marks each.
Section C: Q. No. 22 to 28 are short answer questions and carry 3 marks each.
Section D:Q. No. 29 to 30 are paragraph based questions and carry 4 marks each.
Section E: Q. No. 31 to 33 long answer questions carrying 5 marks each.
There is no overall choice. However, internal choices may have been provided.
Section – A
Q1. The unit of Ebullioscopic constant is
a. K kg mol-1 or K (molality)-1 b. mol kg K-1 or K-1(molality)
b. kg mol K-1 or K-1 (molality) d. K mol K-1 or K(molality)
Q2. Which of the following statement is correct
a. Ecell and ΔrG of cell reaction both are extensive properties .
b. Ecell and ΔrG of cell reaction both are intensive properties .
c. Ecell is an intensive properties while ΔrG of cell reaction is an
extensive properties .
d. Ecell is an extensive properties while ΔrG of cell reaction is an
intensive properties .
Q3. Ecell for some half cell reaction are given below . On the basis of
These mark the correct answer.
, 1. H−(aq)+e−→1/2H2(g);ECello=1.23V
2. 2H2O(l)→O2(g)+4H−(aq)+4e−;ECello=1.23V
3. 2SO2/4−(aq)→S2O2/8−(aq)+2e−;ECello=1.96V
a. In concentrated sulphuric acid solution, water will be oxidised at anode
b. In dilute sulphuric acid solution, hydrogen will be reduced at cathode
c. In dilute sulphuric acid solutions, water will be oxidised at anode
d.In dilute sulphuric acid solution, SO2−4 ion will be oxidised to
tetrathionate ion at anode.
Q4. When a catalyst is added to an exothermic reaction , the heat evolved during
the Reaction ………..
a. increase b. decreases
c. remain unchanged d. may increase or decreased
Q5. KH value for Ar(g) , CO2(g) . HCOH(g) and CH4(g) are 40.39 , 1.67,1.83×10-5
And 0.413 respectively .
The correct arrangement of these gases in the order of their increasing solublity-
a. HCHO<CH4<CO2<Ar b. HCHO<CO2<CH4<Ar
b. Ar<CO2<CH4<HCHO d. Ar<CH4<CO2<HCHO
Q6. The half-life period for a certain first order reaction is 30 minutes. How long
Will it take for 1/32 of the reactant to be left behind ?
a. 60 minutes b. 120 minutes
c. 90 minutes d.150 minutes
Q7. Which response gives the correct co-ordination number (C.N.) and oxidation
Number (O.N.) of the transition metal atom in [Co(NH3)2(H2O)2Cl2]+ ?
a. C.N. = 3; O.N.= +1 b. C.N. = 4; O.N. = +2
c. C.N. = 6; O.N. = +1 d. C.N. = 6; O.N. = +3
Q8. Which of the following is not an example of a set of isomers ?
a. All the sets are isomers .
HALF YEARLY EXAMINATION 2023-24
CLASS – XIIth A
Time : 3 Hrs Subject – Chemistry (043) M.M : 70
General Instruction
Read the following instructions carefully
There are 33 questions in this question paper. All questions are compulsory.
Section A:Q. No. 1 to l6 are objective type questions. Each question carry 1 mark
each.
Section B:Q. No. 17 to 21 are very short answer questions and carry 2 marks each.
Section C: Q. No. 22 to 28 are short answer questions and carry 3 marks each.
Section D:Q. No. 29 to 30 are paragraph based questions and carry 4 marks each.
Section E: Q. No. 31 to 33 long answer questions carrying 5 marks each.
There is no overall choice. However, internal choices may have been provided.
Section – A
Q1. The unit of Ebullioscopic constant is
a. K kg mol-1 or K (molality)-1 b. mol kg K-1 or K-1(molality)
b. kg mol K-1 or K-1 (molality) d. K mol K-1 or K(molality)
Q2. Which of the following statement is correct
a. Ecell and ΔrG of cell reaction both are extensive properties .
b. Ecell and ΔrG of cell reaction both are intensive properties .
c. Ecell is an intensive properties while ΔrG of cell reaction is an
extensive properties .
d. Ecell is an extensive properties while ΔrG of cell reaction is an
intensive properties .
Q3. Ecell for some half cell reaction are given below . On the basis of
These mark the correct answer.
, 1. H−(aq)+e−→1/2H2(g);ECello=1.23V
2. 2H2O(l)→O2(g)+4H−(aq)+4e−;ECello=1.23V
3. 2SO2/4−(aq)→S2O2/8−(aq)+2e−;ECello=1.96V
a. In concentrated sulphuric acid solution, water will be oxidised at anode
b. In dilute sulphuric acid solution, hydrogen will be reduced at cathode
c. In dilute sulphuric acid solutions, water will be oxidised at anode
d.In dilute sulphuric acid solution, SO2−4 ion will be oxidised to
tetrathionate ion at anode.
Q4. When a catalyst is added to an exothermic reaction , the heat evolved during
the Reaction ………..
a. increase b. decreases
c. remain unchanged d. may increase or decreased
Q5. KH value for Ar(g) , CO2(g) . HCOH(g) and CH4(g) are 40.39 , 1.67,1.83×10-5
And 0.413 respectively .
The correct arrangement of these gases in the order of their increasing solublity-
a. HCHO<CH4<CO2<Ar b. HCHO<CO2<CH4<Ar
b. Ar<CO2<CH4<HCHO d. Ar<CH4<CO2<HCHO
Q6. The half-life period for a certain first order reaction is 30 minutes. How long
Will it take for 1/32 of the reactant to be left behind ?
a. 60 minutes b. 120 minutes
c. 90 minutes d.150 minutes
Q7. Which response gives the correct co-ordination number (C.N.) and oxidation
Number (O.N.) of the transition metal atom in [Co(NH3)2(H2O)2Cl2]+ ?
a. C.N. = 3; O.N.= +1 b. C.N. = 4; O.N. = +2
c. C.N. = 6; O.N. = +1 d. C.N. = 6; O.N. = +3
Q8. Which of the following is not an example of a set of isomers ?
a. All the sets are isomers .
