Hwa Chong Insituition (High School)
Secondary One Lower Secondary Science
Past Exam Questions – Separation Techniques
Name: ____________________ ( ) Date: ________________ Class : ___________
Section A
Plea answer all MCQ in the table as provided below.
1 7 13
2 8 14
3 9 15
4 10 16
5 11 17
6 12
2003
1. Which technique could be ud to obtain the elements X and Y from the
compound XY?
统筹方法A Filtration
B Distillation
C Electrolysis
D Crystallisation
2. The diagram shows apparatus being ud to distil awater. At which points
will the temperature be 100O C?
A Y
only
B X and Y only
C Y and Z only
D X, Y and Z heat
电脑杀毒软件哪个好Y X water
out
water
i
Z
3. The diagram shows a chromatogram of veral inks. Which statement is
correct?
♦♦♦
♦♦
♦♦
♦♦
♦♦♦♦
black blue brown green red yellow
A Yellow may be prent in green ink.
B Yellow ink can be ud to make brown ink.化学染发
C Brown ink can be made by mixing blue and red inks.
D Black ink can be made by mixing green, red and yellow inks.
2004
4 A parating funnel is ud to parate the components of a mixture of
A iodine
sugar.
and
B ethanol and water.
C cooking oil and water.
D ammonium chloride and iron filings.
5 Sugar cannot be parated from sugar solution by evaporation to dryness
becau sugar will
A catch fire and burn.
heating.
on
B sublime
C form a lump on heating.
D char and decompo on heating.
6
Which of the following process take place in the t-up shown below?
A boiling and evaporation
B evaporation and melting
C boiling and condensation
D evaporation and condensation
7
In paper chromatography, the chromatography paper is placed in a liquid which dissolves the substances in the dye on the chromatography paper. The liquid(s) that can be ud for such a purpo is/are
I distilled water. II iodine solution. III ethanol.
A I only
B I and III only
C II and III only
D All of the above
heat thermometer distilling flask Liebig condenr water in
water out
conical flask distillate
awater porcelain chips
2005
8 Which of the following process enable pure water to be obtained from
a water?
I filtration
II distillation
III evaporation
osmosis
IV rever
A I and II only
B I and III only
C II and IV only
D III and IV only
9 A cheque was suspected to be forged. Which technique could be ud to
行楷的特点compare the various pigments in the different inks?
A Chromatography
B Evaporation
C Crystallisation
D Sublimation
2006
10 Which of the following methods is most suitable for obtaining a pure, dry低血糖危害
sample of sodium chloride from a mixture of solid sodium chloride and sand?
A Shake the mixture with water, filter and dry the residue on the filter
paper.
B Shake the mixture with water, filter and evaporate the filtrate.
C Heat the mixture gently and collect the substance which sublimes.
D Heat the mixture gently and collect the substance which boils off.
11 Which statement explains why oxygen can be parated from nitrogen by
the fractional distillation of liquid air?
怎么感谢老师A Oxygen is more den than nitrogen.
B Oxygen is more reactive than nitrogen.
C The two elements have different boiling points.
D The two gas are in different groups of the Periodic Table.
12 A mixture of ____________ can be parated by magnetic attraction.
A Iron and steel
B Copper and Steel
C Copper and Tin
and
Tin
D Sand
2007
13 Which of the following is not a way to parate the components of a
亳州美食mixture?
A Evaporation
教学经验分享B Electrolysis
C Chromatography
D Sublimation
14 During distillation, some porcelain chips are added to the mixture being
distilled to ______________.
A make the distilling flask more stable
B purify the mixture
C rai the temperature
D make the boiling smoother
15 A public health inspector suspects that in addition to two harmless dyes
(boiling points 69o C and 71o C), a lollipop also contains a poisonous green dye (boiling point 73o C).
Which of the following can be ud to confirm his suspicion?
A Fractional distillation
B Paper chromatography
C Filtration
D Crystallization
