Guess Paper –
2012
Class – XI
Subject – CHEMISTRY
Class – XI
Subject – CHEMISTRY
Time
allowed : 3hours
Maximum marks : 70
General instructions
1. All
question are compulsory.
2. Marks
for each question are indicated against it.
3. Questions
number 1 to 8 are very short answer questions and carry 1 mark each.
4. Questions
number 9 to 18 are short answer questions and carry 2 marks each.
5. Questions
number 19 to 27 are also short answer questions and 3 marks each.
6.
Questions number 28 to 30 are long answer
questions and carry 5 marks each.
Q1. Calculate the molar mass of the HCl, H2SO4 ?
(Given H=1 ,Cl=35.5 , o=16 ,S=32) 1
Q2.
Calculate the number of protons neutrons and electron in 35Br 80? 1
Q3. Define
law of definite proportion. With example ? 1
Q4.Calculate
the oxidation state of Cl in NaClO4? 1
Q5. What
would be the IUPAC name and symbol for the element with atomic number 120 ? 1
Q6. Draw the
lewis structure for NO3-
? 1
Q7. Arrange
solid, liquid and gas in order of energy and give reasons? 1
Q8. Write
van der waal equation? 1
Q9. Define isotopes and isobars? With example. 2
Q10. Define
Gay lussac law of gases volume and Avogadro law ?
Q11. In the following
redox reaction identify the oxidizing agent and the reducing agent ? 2
Q12.
Consider the following species: 2
N3- , O2- ,
F- , Mg2+ and Al3+
(a) What is common in them?
(b) Arrange them in the order of
increasing ionic radii?
Q13 Which
type of intermolecular forces exist among the following molecules :- 2
1. H2S
molecules 2 . H2O molecules 3 . Cl2 and CCl4
molecules 4 . SiH4
molecules
5 . Helium atom 6 .
HCl molecules
Q14 What will be the minimum pressure required to
compress 500 dm3 of air at 1 bar to 200 dm3 at 30 degree
C . 2
Q15. What do
you understand by isoelectronic species? Name a species that will be
isoelectronic with each of the following atom or ions. 2
i) F- ii)
Ar iii) Mg2+ iv )
Rb+
Q 16.
Calculate the formal charge in each atom of O3 ?
Q
17Calculate the molarity of NaOH in the solution prepared by dissolving its 4gm
in enough water to form 250 ml of the solution ?
Q 18
Calculate the energy of one mole of photons of radiation whose frequency
is 5 x1014 Hz?
Q 19What are
the frequency and wavelength of a photon emitted during a transition from n=5
state to the n= 2 state in hydrogen atom
?
Q 20 Define
the following
i.
Aufbau
Principle
ii.
Pauli
exclusion Principle
iii.
Hund
rule of maximum multiplicity
Q 21 Write
the electronic configuration of the following ions: a) H- b)
Na+ c) O2- d)
F-
i) What are the atomic
number of elements whose outermost electron are represent by a) 3S1 b)2P3 c) 3P5
ii) Which atom are indicated by the
following configuration ?
a) [ He]2S1 b)
[Ne]3S2 3P3
c) [ Ar]4S2 3d1
Q 22 Define covalent and ionic bond with one
example and strength of each?
Q 23 What is VSEPR theory ? How does it explain
the bond angles observed in CH4 , NH3 and H2O
molecule?
Q 24 On the
basis of hybridization explain the shape of Iodine heptafluroide and Sulphar
tetrafluoride?
Q 25What is
the ideal gas equation ? How can it be derived ? Also express it in term of
density of the gas ?
OR
Define
electron gain enthalpy . Describe the factors which determine the magnitude and
sign of electron gain enthalpy . What are the general treands of variation of
electron gain enthalpy in group and period in periodic table?
Identify and
explain the
a) Oxidation b)Reduction
b) Oxidizing agent d)Reducing agent
Q 27 Draw the labeled diagram for deniell cell?
OR
Write the formula for
the following compounds
a) Mercury (II)
chloride
b) Nickel (II) Sulphate
c) Tin (IV) oxide
d) Thallium (I)
sulphate
e) Iron (III )
sulphate
f) Chromium (III )
oxide
Q 28 What is the electrochemical cell? Briefly discuss its construction and
working. How is it represented? Discuss
briefly the function of salt bridge in an electrochemical cell?
Q 29 i) A compound
contain 4.07% hydrogen 24.27% carban and 71.65% chloride. Its molar mass is
98.96g. What are its empirical and molecular formulas?
ii) 50Kg of N2
and 10 Kg of H2 are mixed to produce NH3(g). Calculate
the NH3 formed . Identify the
limiting reagent in the production of NH3 in the situation?
Q 30 How is the
following properties change in group and period . And how ?
a) Electronegativity
b) Ionisation enthalpy
c) Atomic radius
d) Put > or <
sign on the base of atomic radii
i) Na ……….. Cl ii) Al
…………Al3+
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