CADET COLLEGE KOHAT
ENTRANCE EXAMINATION (11TH CLASS) 2012 Marks: 50
Paper : Chemistry
(Use same sheet for answers)
Q No. 1. Fill in the blanks with suitable words. (10)
i). number of atoms are present in 18g H2O.
ii). The sum of proton and neutron present in the nucleus of an atom is called .
iii). Ionization energy from left to right in the periodic table.
iv). Hydrogen attains the electronic configuration of atom during bond formation.
v). A substance may be separated from a mixture on solubility basis by a process called .
vi). Alkali metals hydrides are powerful agent.
vii). Chlorine gas when passed through water, hydrochloric acid and is formed.
viii). Graphite is conductor of electricity.
ix). Metallic oxides are also called
x). In homologous series, the difference in the formulae of two adjacent member is
Q No. 2. Choose the correct choice for the following statements.
i). Enthalpy is more in case when water is
a). at 25oC b). 100oC c). ice d). steam
ii). A strong acid is one which
a). is more concentrated b). have smaller pH value
c). dissociate completely in water d). Change blue litmus to red
iii). oxidation in electrolysis always occurs at
a). anode b). cathode c). any one electrode d). none of these
iv). The solubility of sugar in water increases with increase in
a). pressure b). addition of sugar c). temperature d). All these
v). The state of matter is inter convertible by changing
a). temperature b). pressure c). both a and b d). none of these
vi). Brine is the aqueous solution of
a). NaNO3 b). Na2CO3 c). NaCl d). Na2SO4
vii). The purest form of iron is
a). pig iron b). wrought iron c). steel d). all these
viii). Chlorine forms phosgene gas with
a). Methane b). Ammonia c). carbon monoxide d). water
ix). Which of the following is poison to catalyst in contact process
a). Lead b). Arsenic c). Tin d). Iron oxide
x). The chemical formula of magnetic oxide is .
a). FeO b). Fe2O3 c). Fe3O4 d). Fe2O3 . 2H2O
Q No. 3. Give brief answers to the following. (3×10=30)
a). Define :
b). Write the electronic configuration of Cl17 , K19 and Mg12.
c). What do you mean by electron affinity?
d). Draw dot and cross structure of i). CO2 ii). CH4 iii). NH3
e). Give difference between solution and suspension.
f). Give three chemical properties of hydrogen.
g). Differentiate between hard water and heavy water.
h). Calculate the number of molecules and atoms in 171 gram of C12H22O11.
j). How will you test Chloride, Bromide and iodide in laboratory?
k). Write complete and balance equation.
i). Cu + H2 SO4 aq
ii). NH3 + O2
iii). pbS + O3
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