Download 1. (a) state Law of multiple proportion (2) (b) A compound contains

CHEMISTRY
HSE-I
Maximum marks: 60
Time: 2hrs
Cool of time: 15mintes
1. (a) state Law of multiple proportion
(2)
(b) A compound contains 40% C, 6.66% H and the rest of oxygen. Find
its empirical formula.
(2)
2. (a) Name the charge less particle and find its number in the following
mulei
16
56
8O ,
26 Fe
(1)
(b) Sketch the shape and orientations of 2p orbitals.
(1 ½)
(c) An atomic orbital has n=3.
(i) What are the possible values of l and m
(ii) List the quantum number (m and l ) of electrons for 3d orbital .
(iii) Which of the following orbitals are possible
1p, 2s, 2p and 3f
(2 ½)
3. (a) Arrange the following halogens in the increasing order of their
electron Gain enthalpy
F, Cl, Br, I
(1)
(b) The graphical representation of Ionisation energy against atomic
number of certain elements are given below.
(i) How Ionisation energy varies along a period
(1)
(ii) How will you explain the unexpected values of Boron and
Oxygen
(2)
4. (a) Out of NH3 and NF3 which has higher dipole moment and given
reason
(b)
(c)
5. (a)
(b)
(1)
Discuss the shape and hybridization of the following molecules using
the VSEPR theory
(i) Becl2 (ii) NH3 (iii) C2H2 (iv) PCl5
(2)
Using molecular orbital theory, explain the paramagnetic behaviour of
O2 and find its bond order
(2)
Dalton’s law of pastial pressure is not applicable to gaseous mixture
Of NH3 and Hcl gases. Give reason
(1)
In an examination one student wrote that ‘Real gases be have ideally
at low temperature and high pressure.
(i)
Is the above statement correct or not?
(ii) Why do real gases deviate from ideality?
(iii) Write Vander waal’s equation for ‘n’ moles of an ideal gas.
(2)
(c) Analyse the graphs given below .Which graph represents charle’s
law?
Explain.
(2)
6. (a) Classify the following properties in to intensive and extensive
property
Volume, density, work, enthalpy.
(1)
(b) Calculate the enthalpy change of the reaction
CO (g) + ½ O2 (g)
CO2 (g) from the following data.
(i) C(S) + O 2 (g)
(ii)C(S) + ½ O 2 (g)
CO2 (g); 4H= -394.9KJ
CO (g); 4H = -110.5KJ
7 (a) Sate Le chatelier’s principle
(b) Describe the effect of
(i) Addition of H2 (ii) addition of CH3OH
(3)
(1)
(iii) Removal of CO and (IV) removal of CH3OH on the equilibrium
of the reaction
2H 2(g) + CO (g)
CH3 OH (g)
(2)
(c) The species H2O, HCO3-, HSO4- and NH3 can act both as Bronsted
Acids and bases. For each case give the corresponding conjugate acid
and base
(2)
8
Assign the oxidation number of the underlined elements in each of the
Following species
H2O , CaO 2, Hcl O4 , K2MnO4, Na H, NaBH4
(3)
9.
Permanent Hardness is due to the presence of chlorides and sulphates
of Calcium and magnesium in water.
(a) Give one method for the removal of permanent Hardness
(2)
(b) H2O2 is stored in wax – lined glass or plastic vessels in dark. Give
reason
(2)
10.
(a) Write the molecular formula of
(i) plaster of Paris and (ii) Gypsum
(1)
(b) Lithium shows diagonal relationship to magnesium.
(i) Give the anomalous behaviour of Li and Mg.
(3)
11.
(a) Is boric acid a protic acid? Explain
(1)
(b) Suggest a reason as to why CO is poisonous
(1)
(c) Carbon exhibits many allotropic forms. One of them is fullerenes.
(i) Write short notes on fullerenes
(2)
12. (a) The IUPAC name and structural formula of some organic
Compounds are given below. Match them properly
Column A
Column B
(1) CH3 - CH2 – CH=CH-CH2OH
(1) 2 , 2 – dimethrl propane
CH3
(2) CH3
C
(2) pentane – 1, 4- diol
CH3
CH3
(3) pent – 2 – en – 1 – 01
(3) CH 2 = C
CH = CH2
CH3
(4) CH3
CH
CH2
(4) 2 methyl but -1, 3 - die
CH
OH
OH
(2)
(b)Explain the terms Inductive and electrometric effect.
(3)
13. (a) Benzene is extra ordinary stable though it contains three double
bonds. Give reason
(2)
Peroxide
(b) CH3 – CH = CH2 + HBr
CH3 – CH2 – CH2 – Br
I
CH3 – CH - CH3
Br
II
Which is the major product. Justify your answer.
(3)
14. Taj mahal is being slowly dis figured and the marble is getting
discoloured and lusterless.
(a) What is the reason behind it
(1)
(b) Suggest remedial measures.
(2)
Prepared by
HSST (chemistry)
A .S. H. S.S
PARIPPALLY