Maxfort School – Rohini
Model Test Paper
Chemistry
Class – XI
Max Marks: 70
Name: ………….
Instructions for the students:
(a) Please read the paper carefully and write your answers only on the answer sheets provided separately
(b) Copy the Question number and its part number on your answer sheet correctly from the question paper and
write it in the left margin neatly
(c) This paper consists of 2 pages
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1. Give the IUPAC name of the lowest molecular weight alkane that contains a quaternary carbon.
2. What is Lindlar’s catalyst?
3. How will you detect the presence of unsaturation in an organic compound?
4. Define homologous series.
5. Name the chain isomer of C5H12 which has a tertiary H-atom.
6. What is water gas?
7. What is hybridization of B in B2H6?
8. State Le-Chatellier’s principle.
9. Write the structure of different isomers of alkyl halide having molecular formula C4H9Br.
10. The Mn3+ ion is unstable in solution and undergoes disproportionation to give Mn 2+, MnO2 and H+ ion.
Write a balanced ionic equation for the reaction.
11. Prove that the pressure necessary to obtain 50% dissociation of PCl5 at 500K is numerically equal to
three times the value of the equilibrium constant Kp.
12. If 0.561g KOH is dissolved in water to give 200 ml of solution at 298K, calculate the concentration of
potassium, hydrogen and hydroxyl ion. What is its pH?
13. Give the electronic configuration of the following ions.
(a) H(b) Cr3+
14. Find (a) the total number and (b) total mass of proton in 34 mg of NH 3. (mass of proton = 1.6726 X 10-27
kg)
15. Show by a chemical reaction with water that Na2O is a basic oxide and Cl2O7 is an acidic oxide.
16. Which of the following two have higher ionization enthalpy and why?
N,O
17. In a process, 701 joules of heat is absorbed by a system and 394 joules of work is done by the system.
What is the change in internal energy of the process?
18. Enthalpy of combustion of C to CO2 is -393.5 KJ/mol. Calculate the heat released upon formation of
35.2g of CO2 from carbon and dioxygen gas.
19. Balance the following redox reaction by ion-electron method.
Cr2O72- + SO2
Cr3+ + SO42- (in acidic medium)
20. (a) Write resonating structure of nitrobenzene.
(b) Write bond line structure of tertbutyl alcohol.
21. Calculate the pH of the resultant mixture 10 ml of 0.1M H2SO4 + 10 ml of 0.1M KOH.
22. Enthalpy of combustion of methane, graphite and dihydrogen at 298K are -890.3 KJ/mol, -393.5 KJ/mol
and -285.8 KJ/mol respectively. Find enthalpy of formation of CH4.
23. Payload is defined as the difference the mass of the displaced air and the mass of the balloon. Calculate
the payload when a balloon of radius 10m, mass 100 kg is filled with Helium at 1.66 bar at 27˚C.
(density of air = 1.2 kg/m3, R = 0.083 lit bar K-1 mol-1)
24. 3g of H2 reacts with 29g of O2 to form H2O.
(a) Which is the limiting reactant?
(b) Calculate the maximum of H2O that can be formed.
(c) Calculate the amount of reactant left unreacted.
25. Using molecular orbital theory, compare the bond energy, bond length and magnetic character of CN
and CN-1 species.
26. Predict the shape of the following using VSEPR theory.
(a) I3 –
(b) XeF4
(c) XeF6
27. (a) When an alkali metal dissolves in liquid ammonia, the solution can acquire different colour. Explain
the reaction for this type of colour change.
(b) Is boric acid a Protic acid? Explain.
28. (a) Arrange the following in increasing order of their acidic character. Give reason also.
BF3 , BCl3 , BBr3 , BI3
(b) Be and Mg do not give colour to flame whereas other alkaline earth metals do so. Why?
(c) Write the structure of diborane.
29. (i) Write IUPAC name of the following.
a) CH3 —CH—CH2—CHO
b)
CH3
I
I
OH
CH3—C—OCH3
I
CH3
(ii) Write mechanism of Kolbe’s electrolytic method.
30. (a) Write ozonolysis product of 2-methyl but-2-zene.
(b) Write mechanism of the reaction.
NO2
HNO3
H2SO4
(c) Draw cis-trans isomer of Hex-2-ene.