RTS Chemistry SPM Question Bank Chapter 12

 

 Essential Chemistry Chemistry SPM Question Bank 

Chapter 12: Oxidation and Reduction Paper 1 1)

What is the oxidation number of the sulphur element in a sulphate ion, SO 42-? A  -2 C  +6 B  -6

D  -8

2) l2 + 2!" # "2 + 2!l $he oxidation number of %hlorine in the rea%tion abo&e %han'es from A  O to -1 C  1 to -1 B  -1 to O D  -2 to O

()

Whi%h of the folloin' %an a%t as an oxidisin' a'ent? I hlorine 'as II  *romine ater  III  Sulphur dioxide 'as IV  $in"") %hloride solution A " and "" onl B  """ and " onl

C  ", "" and """ onl D  "", """ and and " onl

4)

Whi%h of of th the ffo olloin' re rea%tions is not a redox rea%tion? A  .ispla%ement C  /le%trolsis B 0re%ipitation D  ustin'

)

When a %ertain tpe of 'as is %hannelled into an iron "") sulphate solution, it ill %han'e the 'reen %olour of the solution into bron3 $he 'as is most liel A  hdro'en %hloride C %hlorine B  hdro'en sulphide

6)

D  ammonia

When an ion is dis%har'ed at the anode durin' ele%trolsis, it experien%es A  ionisation C  oxidation B  pre%ipitation D  redu%tion

 

 

5)

What is the ener' %han'e that o%%urs in the %ell shon in the dia'ram belo?

  A  hemi%al ener' ener' into ineti% ener' ener' B  /le%tri%al ener' ener' into heat ener' C  /le%tri%al ener' ener' into %hemi%al %hemi%al ener' D  hemi%al ener' into ele%tri%al ener'

8)

Whi%h of the folloin' euations o%%urs at the anode?

A  7e #7e2+ + 2eB  O2 + 22O + 4e- # 4OC 4O- #  O2 + 22O + 4e-  D  7e2+ + 2e- # 7e

9)

$he fi'ure belo shos the extra%tion pro%ess of tin in a blast furna%e3

What is substan%e Y ? A "ron B arbon

C  0latinum D  :a'nesium

 

1;)

$he fi'ure belo shos an experiment that is %arried out to stud the %orrosion of iron3

  $he iron nail ill be%ome %orroded at the sloest rate if the metal %ontainer is made of  A  ma'nesium C  aluminium B %opper  D  tin

Paper 2 Structured question

 P 

Q

  $he fi'ure abo&e shos an apparatus set-up that is used to stud the rea%tion that o%%urs in test tubes P  and  and Q3 a) What %an %an be obser obser&ed &ed in test ttubes ubes P  and  and Q? b) Write Write the ioni% ioni% euation euation for the rea%tion rea%tion in a)3 a)3 %) Some of the the rea%tion rea%tion produ% produ%ts ts in test test tube tube Q is mixed ith 1,1,1-tri%hloroethane liuid and then shaen3 i) What What is th thee %olo %olour ur of the 1,1 1,1,1,1-tri tri%hl %hloro oroeth ethane ane liuid liuid la laer er tthat hat is forme formed? d? ii ii)) Write Write an ion ion ele%tr ele%tron on euati euation on to to repre represen sentt th thee forma formatio tion n of the sub substa stan% n%ee that 'i&es the 1,1,1-tri%hloroethane liuid laer its %olour3 d) State the the fun%tion fun%tion of the 2 mars iii) /xplain the differen%e beteen the names of the to %ompounds a%%ordin' to the "A0B namin' sstem3 >2 mars b) $he fi'ure belo belo shos the the set-up of apparatus apparatus that is used in an experiment experiment to stud stud ele%tron transfer at a distan%e3

i) @a @ame the redu%in' a'ent in this experiment3 >1 mar ii) Write Write the half-euation for the rea%tion that o%%urs at the ne'ati&e terminal and the  positi&e terminal3 terminal3 > mars iii) *ased on the anser in b)ii), des%ribe the oxidation and redu%tion redu%tion pro%esses in terms of the ele%tron transfer that o%%urs at the ne'ati&e terminal and the positi&e terminal as ell as state the obser&ation that %an be made at the end of the experiment3 >8 mars

 

Paper ! $he fi'ure belo shos an experiment that is %arried out to determine the order of metals in the rea%ti&it series of metals, b usin' the %arbon element3

:ixtures of the folloin' substan%es are heated stron'l in the %ru%ible3 Eead"") oxide and %arbon Fin oxide and %arbon opper"") oxide and %arbon

$he results of the experiment are re%orded in the table belo3 Experi"ent

O#ser$ation on the "ixture o% su#stances *ri'ht embers

a) Obser&e ea%h dia'ram in th thee table abo&e3 omplete omplete the obser&ation on the mixture mixture of substan%es b statin' the obser&ation made on the rea%tion that o%%urs3 >Obser&e b) omplete the table belo belo based on the obser&ations3 obser&ations3 i) ariable that is manipulatedC   DDDDDDDDDDDDDDDDDDDDDDDDDDD  ii) a ariable riable that respondsC  DDDDDDDDDDDDDDDDDDDDDDDDD  DDDDDDDDDDDD DDDDDDDDDDDDDDDDDD  DDDDD  iii) a ariable riable that is ept %onstantC  DDDDDDDDDDDDDDDDDDDDDDDDD  DDDDDDDDDDDD DDDDDDDDDDDDDDDDDD  DDDDD   

i) Wa Wa that &ariable is manipulatedC  DDDDDDDDDDDDDDDDDDDDDDDD  DDDDDDDDDDD DDDDDDDDDDDDDDDDDDDDDDDD  DDDDDDDDDDD  ii) Obser&ation of of the respondin' respondin' &ariableC  DDDDDDDDDDDDDDDDDDDDDDDD  DDDDDDDDDDD DDDDDDDDDDDDDDDDDDDDDDDD  DDDDDDDDDDD  iii) Wa Wa to maintain the &ariable that is ept %onstantC  DDDDDDDDDDDDDDDDDDDDDDDD  DDDDDDDDDDD DDDDDDDDDDDDDDDDDDDDDDDD  DDDDDDDDDDD  >:ethod of %ontrollin' the &ariable

 

%) S Sttate the hpothesis of this experiment3

>:ain' the hpothesis

d) *ased on the obser&ation obser&ation made in this exper experiment, iment, arran'e the lead,