目播育教莫三集張八第日四卡月十年午戊后夏 WAH KIU YAT PO
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化學
(七)
Chemistry
Question 10
(a) In the experiment below a
mixture of potassium nitrate and concentrated sulphuric acid was gently hested in a hard glass retort and a pale- yellow liquid I was collected in a round-bottomed flask cooled under the top water. mixture.
gaas
retort
brown fumes
tap
heat.
receiver
pale-yellow Liquid L
(i) Name-the pale-yellow.
liquid .
(ii) (inite an equation for
the fomation of L
(iii)Wane the substance which, by its presence, imparted a brown colour to the fumes observed.
(iv) Give an equation for the
formation of the brown
gumes.
Liquid') is in fect.
colourless liquid. Why
aid the liquid. L obtained:
in the above experiment
colour?
have a pele-yellow only
(vi) Suggest two simple ways
to remove the yellow
colour
of
liquid
I;
(vii)Why is it not desirable
to hest the mixture in the retort strongly?
(viii)What is the mrpose of
cooling the receiver with the tap water?
Question.11
郭日悩
(a) In the experiment as snown.
below lead(II) nitrate crystals are heated in a pyrex test- tube and a liquid X and a gas Y are of tasted.
(ix) Why is it necessary to lead(II)nitrate
use an all-glass apperatus
in the above experiment?
(x) Describe your observation.
and explain, with the help of balanced equations in the following cases- (1) Liquid Li is added to
some copper turnings. When the reaction ceases, the reaction mixture is filtered. The filtrate is evap- orated to dryness and. the solid residue is heated stronely. (2) A mixture of sulphur
powder and liquid L
(b)
is heated, with some bromine. as the data- ∵lyst, for some time. The reaction mixture is filtered and to the filtrate is added `a few drops of acidu
ified barium chloride ̇solution.
Two of the common oxides of
·nitrogen are nitrogen monoxide and nitrogen dioxide."
(1)
State the oxidation nume ber of nitrogen in the lover and higher oxides of nitrogen respectively. (11) State the reagent(s) and
condition(s) necessary
for converting the lower oxide to the higher oxide of nitrogen.
(iii) Explain why a burning magnesitan.can contiè
to burn in nitrogen dio- xide whereas a burning:
wooden anlint
carinot:
heat
water
liquid X
Kas Y
(1) Nme the substanced
and Y.
(ii) A solid residue Z leavea
五期星
日四廿月一十年八七九一层公年七十六闔民華中
(vi) What will be obtained on
adding some liquid L to dilute sodium hydroxide solution?
Give an equation for the reaction.
(vii). What will be obtained
on heating some solid Z with powdered cliarcoalP Give an equation for the reaction.
(viii)If 560 cm of oxygen,
measured at s.t.p., is obtained in the above experiment, what will be the mass of lend(II)nit rate that has rezated?
behind in the pyrey test (b) In general, the nitrates are
tube after heating. What is the solid Z?
(iii) rate an equation for
the reaction when lead (II)nitrate crystals are heated"
(iv) Way is it not desirable to prepare the liquid X by heating some conger (II)nitr te
v hys
to
collect the gas Yover: water?
(vi) Why is the solid Z only
sparingly. soluble in
both dilute sulphuric acid and dilute hydrochI〜 "orio' acid, but very: soluble in dilute nitrid acid?
(v) A few drops of liquid K
is dissolved in some distilled water.
(1) What will be the pi
of the resultisie solution?.
(2) What will be formed. in the solrtion?
(3) Give an equation for
the reaction on
dissolving L in wnter
thermally unstable and will undergo decomposition on heating. Give an equation for: the thermal decomposition:
of each of the nitrated below::
(1) potessium nitrate crystals (ii) zinc(II)nitrate crystals (iii)silver nitrate crystals (iv) animonium nitrate crystals:
'Question 12
(a) In the expeciment as below
oxygen gas is bubbled through some concentrated aqueous anmonia above which a hot platinum wire is han el from a, piros rod.
glass rod:
platinum
سين
oxygen
gas
oncentrated
ammonia
solution
(1) Wave the substance formed
at: the platinum wire..
(id) Give an equation for the reaction at the platinum wire.
(iii)What is observed near around the wire? Give. an equation for its formation.
(iv) What is the function of the platinum wire?
(v) The pletimum wire needs. initial heating only as, orice. the reaction has started, no more heating of the wire is necessary.
xplain why is this so. (vi). A few drops of litmus
are added to solition in the flask at the end of: the experiment. What is the colour of the litmus aw? why?
(b) Describe what would you observe
and explain, with the help of cquctions, your observation in each of the following casest: (1)Bqueous amonia solitici
is added dropwise to an aqueous solution of zino nitrite until an excess of ammonia solution has ben alied.
(ii).iqueous ammonia solution
ia added dropwise to an aqueous solution of copper(IT) sulphate until an excess of ammonia has Heun added)
(111)A mixture of sodium nit-
rate, copper trings" and concentrated alphuric 2011 is heated in a hard test-tube.j
(iv) A mixture of sodium
nitrite and ammonium chloride is heated:
(v):An excess of ammonia gas)
fie mixed with chlorine
gas •
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