www.dhsekerala.gov.in Chemistry Model Question Paper : Plus Two/ 12th Std/ +2/ HSE
Board : Higher Secondary Education, Government Of Kerala
Exam : HSE Chemistry
Document type : Question Paper
Website : dhsekerala.gov.in
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HSE I Chemistry Model Question :
Maximum : 60 Scores
Time:2 Hours
Cool off time : 15 minutes
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1. The laws of chemical combination governs the formation of compounds from elements.
a) State the Law of Conservation of Mass. Who put forward this law – (1 –
b) Determine the empirical formula of an oxide of Iron which contain 69.9% Iron and
30.1% Oxygen by mass. (2 –
2. Quantum numbers are a set of four numbers used to designate each electron in an atom.
a) What are the values of n,l and m for valence electron of Magnesium – (1 –
b) How many orbitals are possible when = 3 – (1)
c) Calculate the wavelength of electron moving with a velocity of 2.05 × 10- – (2 –
3. Ionization enthalpy variation of second period elements is given below :
a) Is the graph correct- Justify your answer. (2) b) Resketch the graph (2)
Ne F C O IE B N Be Li Atomic number
4. Give reason :
a) (i) – is not hydrolyzed but – is hydrolyzed (1)
(ii)Graphite conduct electricity but Diamond does not (1)
b) What is borax bead test- (2)
5. Based on VSEPR theory, complete the following table :
a) No.of – pair Bond angle Geometry of molecule Example
3 ———————- ————————–
6 ———————- ————————–
b) – has higher boiling point than – , why – (1)
6. A science student doing an experiment with an ideal gas at constant temperature obtained
a) Name the law he is trying to verify (1) b) What do you understand from the graph –
Write the mathematical expression and statement of the law. (1) P
c) Critical temperature of – is 30.98- and that of – 1
is 132.5- . Which one is easily liquefiable- (1)
7. a) Predict the sign of – S in the following process :
i) Sublimation of Iodine ii) Conversion of graphite into diamond
iii) – + – – – + – iv) Melting of ice (2)
b) Calculate the work done for the reversible isothermal expression of 1 mole of an
ideal gas at 27- from a volume of 10 – to a volume of 20 – (2)
OR
Calculate the enthalpy of formation of Methane, given that the enthalpies of combustion
of Methane, Graphite and Hydrogen are -890.2 – , -393.4 – and -285.7 – respectively
(2) 8. a) Predict the change of – in the following cases. Explain the reason
i) 0.1- – is diluted with water (1)
ii) 0.1- – is diluted with water (1)
iii) Two drops of dil – is added to Ammonium acetate (1)
iv) Few crystals of Sodium acetate are dissolved in a sample of (1) Ammonium
1. One Mole of a substance always contains same number of particles, whatever the substance may be. (a) Define mole. ( 112fff)
(b) Calculate the number of moles present in (i) 22 g CO2 (ii) 27 g H2O ( 112fff)
2. Quantum numbers are address of an electron in an atom.
(a) Name the three quantum numbers which are necessary to describe an orbital. What are the permitted values for these ? (3)
(b) Describe the orbital with the following quantum numbers.
(i) n = 1 ; l = 0
(ii) n = 2 ; l = 1 ; m = 0
(iii) n = 3 ; l = 2 (2)
(iv) n = 4 ; l = 1
3. Low ionization enthalpy and high electron affinity favours ionic bond.
(a) Which of the following pairs of the elements would you expect to have lower ionization enthalpy ? Explain.
(i) Cl or F (ii) Cl or S (1)
(b) Arrange the following elements in the decreasing order of negative electron gain enthalpy ? B, C, N, O (1)
4. The attractive force which hold together the atoms in a molecule is called chemical bond.
(a) NaCl is a bad conductor of electricity in the solid state. Why ? (1)
(b) Why does NaCl give a white precipitate with AgNO3 solution but CCl4 does not ? (2)
(c) What shapes are associated with the following hybrid orbitals ? (i) sp2 (ii) sp3d