116 Theme4 I Periodicity

For each of the questions, there are four possible choices.Choose the one you consider correct and record your choice.

d 1. Which 0f the following metals does not react with dilutehydrochloric acid to produce hydrogen gas?

A lron B Zinc

C Copper D lVagnesium ( )

d 2. Which of the following oxides is most readily reduced by

heating in a stream of hydrogen gas?

A Zinc oxide B Sodium oxide

C Coppe(ll) oxide D Aluminium oxide ( )

d3. Which of the following explains why zinc can displace copper

from coppe(ll) sulfate?

A Zinc is more reactive than copper.

B Zinc loses electrons during a reaction to form zinc{ll) ions.

C Zinc is lower down the reactivity series compared tocopper.

D Zinc is a strong reducing agent and can reduce coppe(ll)ions to copper. (

)

d4. Steel and aluminlum are used to make vehicles as they have

high strength to weight ratios. Steel and aluminium can also

deform to absorb an impact.

Which of the following statements explains why steel and

aluminium can deform to absorb an impact?

A Cations are arranged in a 'sea' of delocalised valence

electrons.

B [t/etal atoms lose electrons to form cations in the metalliclattice.

C Steel and aluminium are thin and cannot withstand theforce of the impact.

D Steel and aluminium have relatively lower melting points

compared to other metals. ( )

d 5. Which of the following gives the order of decreasing reactivityof the metals calcium, lead, potassium and zinc?

A Lead, zinc, calcium, potassium

B Lead, zinc, potassium, calcium

C Potassium, calcium, zinc, lead

D Calcium, potassium, zinc, lead ( )

6. lt/etal X reacts slowly with water but reacts vigorously withsteam t0 form hydrogen gas. Which of the following could

be X?

A lron B Copper

C Sodium D Calcium ( )

7 . Three strips of the same metal were dipped into three differentsolutions as shown:

metal strips

CuSOa(aq) MgSOa(aq) Fe(NO:)z (aq)

A metallic deposit was observed on each of the metal stripsdipped into CuS0o and Fe(N0,), solutions. What could themetal be?

AFe B Ca

CA/ DZn ( )

B. Which of the following reactions could take place readily?

A Fe(s) + Zn2t(aq) - Fez-(aq) + Zn(s)

B N/g(s)+ Ca2-(aq) - [Vg2-(aq)+ Ca(s)

C Zn(s) + Cu2-(aq) - Zn2-(aq) + Cu(s)

D 3Zn(s)+ 2Al3t(aq) * 3Zn2-(aq)+ 2Al(s) ( )

9. Which of the following oxides cannot be reduced by both

hydrogen gas and carbon to its metals?

A CaO B ZnO

CPb0 DCuO ( )

'10. A piece of zinc is immersed into an aqueous solutioncontaining a metal nitrate. The metal forms a thin layer on

the surface of the zinc very qulckly. Which of the followingcould be the metal nitrate?

A Sodium nitrateB Coppe(ll) nitrateC Potassium nitrateD N/agnesium nitrate ( )

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1 1. The diagrams belowshowthe particulate representations ofvarious materials. Which of the following would most likelyrepresent an alloy?

A

12. Which of the following shows the relationship betweenstrength and brittleness of carbon steel, an alloy of steel withcarbon?

(

- ) represents strength

( --- ) represents brittleness

A Sfength/Brittleness

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B Strength/Brittleness

C Strength/Brittleness

% Carbon

% Carbon

9c Carbon

Vo Carbon ( )

D Strength/Brittleness

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Unit 15 I M*trsls {}rtcl *eactivily Seri*s 117

13. Which of the following is not a general property of metals?

A lVletals conduct electricity by the movement of mobile

valence electrons.B N/etals do not decompose when an electric current is

passed through them.

C Metals lose electrons to form positive cations during a

chemical reaction.D N/etals are very reactive and can readily react with non-

metals to form ionic compounds. ( )

14. Which of the following statements explains why metals aregood thermal conductors?

A Metals have a 'sea' of delocalised valence electrons.

B lVetals have a lattice structure which allows them todeform easily.

C [\/etals have closely packed metal cations arranged in

the metal lattice.D IVetals usually have one to three valence electrons which

will be lost during a chemical reaction to form an ionic

bond. ( )

15. Aluminium is used to make cooking utensils even though itis very high in the reactivity series. Which of the followingstatements justifies its use?

A Aluminium has a much lower density compared to iron.

B Aluminium has a relatively high melting point compared

to other metals.

C Aluminium can react readily with oxygen in the air to formaluminium oxide.

D Aluminium loses three valence electrons readily during

a chemical reaction. ( )

16. lVetal cubes of the same size made of three different metals,

X, Y and Z, were placed into test tubes containing dilutesulfuric acid.

The following observations were recorded.

What are the possible identities of metals X, Y and Z?

x Y Z

A Na K Cu

B It/g Na Pt

C AI Zn Pb

D Zn lvs Cu

x Eff ervescence observed

Y Effervescence observed; metal cube

floated on the surface of acid

z No effervescence observed

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Metal 0bservation

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118 Theme 4 I ?*riadicrty

17. The bar graph below shows the trend in a property forelements across Period 3 of the Periodic Table.

Period 3

Which of the following properties could be represented by

the bar graph?

A Valency B Size of ion

C lVelting point D Charge of ion ( )

18. The bar graph below shows the trend in a property forelements across Period 2 of the Periodic Table.

Period 2

Which of the following properties could be represented by

the bar graph?

A Valency B Size of ion

C l\4elting point D Charge of ion ( )

19. The diagram below was set up to reduce a black-colouredmetal oxide, Y.

Y

heat

x

Dilute hydrochloric acid was slowly added from an additionfunnel to X in the conical flask. The gas evolved was passed

through the heated glass tube containing Y. At the end of thereaction, the black-coloured metal oxide had turned pink.

What are the possible identrties of X and Y?

x Y

A IVg Cu0

B Zn Pb0

C CaC0, Cu0

D Ca0 Pb0

20. The welding of railway tracks was done in the past with theaid of a chemical reaction known as the thermite reaction.The thermite reaction involves the displacement of a metalfrom its solid oxide by another metal.

Which of the following equations could representthe thermitereaction?

A N/90 +Znn N/g+ZnO

B A/203 + 3Zn - 3Zn0 + 2AlC 2Fe + A/,0, - 2Al + Fer1,

D Fer0, + 2Al - Alr0r+ 2Fe ( )

21. Which of the following statements explains why 99.99%copper is used in manufacturing hrgh quality electrical wiresfor audio equipment?

A Copper is a good conductor of electricity.B 99.99% copper is almost free of impurities.C 99.99% copper is less ductile and cannot be stretched

easily.

D Copper which is of a high purity can conduct electriccurrent better. ( )

22. \Aelal cubes of the same size were each dropped into a beakercontaining dilute hydrochloric acid.

dilutehydrochloricacid

beaker A beaker B beaker C

What are the possible rdentities of the metal cubes in thebeakers?

Beaker A Beaker B Beaker C

A tvlg Fe Cu

B Na K Pb

C Pb N/g Ag

D Zn AI Au

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23. Which of the following solutions can oxidise a zinc rod

immersed into it?

A Aqueous zinc nitrateB Aqueous sodium nitrateC Aqueous coppe(ll) sulfateD Aqueous magnesium nitrate ( )

24. Ihe table below shows the reaction of four metals, W, X,

Y andZ, with dilute sulfuric acid and with aqueous sulfateof W.

MetalReaction withdilute sulfuric

acid

Reaction withaqueous sulfate

ofW

W No hydrogen

evolved

No observable

reaction

x Hydrogen evolved Solid W forms

Y Hydrogen evolved No observablereaction

z Hydrogen evolved Solid W forms

Which of the following shows the correct order of reactivity

of the metals?

Mostreactive

[eastreactive

A z Y x W

B z Y W x

C x z Y w

D x z W Y

NI4D25 The table below shows the reactions of manganese.

Beaction with 0bservation

Dilute acid Hydrogen gas evolved

Cold water No observable reaction

Steam Hydrogen gas evolved

Which of the following gives the correct arrangement of the

metals in order of increasing reactivity?

A [t/anganese, calcium, lead

B Calcium, lead, manganese

C Lead, calcium, manganese

D Lead, manganese, calcium ( )

Unit '15 I fl,rclals crld *.*activity Series 119

26. A metal oxide was placed into a glass tube and heatedstrongly while hydrogen gas was passed over it.

metal oxide

hydrogengas ln

excess hydrogengas is bumt offhere

fused calcium chloride

The yellow coloured metal oxide turned a silvery colour aftersome time. The silvery coloured substance was dissolvedpartially with shaking in excess dilute sulfuric acid.

What could be the identity of the metal oxide and the reaction

which took place in the glass tube?

Metaloxide Beaction

A Zinc oxide Red ucti on

B Lead(ll) oxide Bed ucti on

C Coppe(ll)oxide 0xidation

D Sodium oxide 0xidati on

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The reaction of metal X and its compounds are as follows:

X + HrO * No reaction

X+ZHCI-XCl,+H,X0 + H, - No reaction

X0+C-X+C0Which of the following metals could be X?

AZn B N/g

CPb DCu ( )

The reactivity of metals X, Y and Z and their compounds are

as follows:

X + H,0 - No reaction

X+ZHC| - XClr+H,X0 + H, - No reaction

X0+C*X+C0

Y+HrO-X0+HzY +ZHCI-YClr+H,Y0 + H, * No reaction

Y0+C*Noreaction

Z+Hr1 - No reaction

Z+ ZHCI - ZClr+ H,

Z0 +Hr-Z+Hz1Z0+C-Z+C0

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12O Theme4 I Periodicity

Which of the following shows the correct order of reactivityof the metals?

Most reactive Least reactive

A x z Y

B z Y x

C Y z x

D x Y z

31. The bar graph below shows the trend of a property forelements across Period 2 of the Periodic Table.

Property

Period 2

Which of the following properties could be represented by

the bar graph?

A Valency B Size of ion

C Charge of ion D N/elting point ( )

32. Which of the following metals will not react completely withdilute sulfuric acid to form a salt and hydrogen gas?

A Lead B SodiumC Calcium D lVagnesium ( )

33. A copper coin when immersed into a beaker of aqueoussilver nitrate becomes coated with a layer of shiny silverymaterial. Which of the following represents the ionic equationresponsible for this observation?

A Cu2t(aq)+ Ag(s) * Ag.(aq)+ Cu(s)

B Cu2.(aq)+ 2Ag(s) - 2Ag-(aq)+ Cu(s)

C Cu(s)+ Ag'(aq) - Ag(s) + Cu2-(aq)

D Cu(s)+ 2Ag-(aq) - 2Ag(s) + Cu2t(aq) ( )

34. Which of the following describes an element which liesbetween aluminium and copper in the reactivity series?

A lt forms a carbonate which does not decompose onheating.

B lt displaces potassium from an aqueous solution ofpotassium iodide.

C lt forms a hydroxide which decomposes to give watervapour on heating.

D lt reacts with dilute sulfuric acid to produce a gas thatrelights a glowing splint. (

)

35. The diagram below shows a setup with two different blocksof metal X and metal Y immersed in water.

The reactivity of metals X and Y and their compounds are as

follows:

X(s)+ Y(N0,),(aq) - X(N0s)z(aq)+ Y(s)

Upon heating: XC0,(s) -, XO(s)+ C0,(g)

Upon heating: YCO,(s) * Y0(s)+ C0,(g)

X0(s)+ H2(g)- No reaction

Y0(s)+ H2(g) * Y(s)+ H,O(g)

What could be metals X and Y?

x Y

A N/g Cu

B Zn AI

C Pb Cu

D Fe Ag

Three experiments to investigate the reactivity of four metals,tin, iron, lead and silver, were performed. The observationsare as shown below:

tin lead

iron(ll)nitrate lead(Il)nitrate

Which of the following shows the correct order of reactivityof the four metals?

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Mostreactiue

[eastreactive

A lron Tin Lead Silver

D Silver Lead Tin lron

C Tin lron Lead Silver

D Tin Lead lro n Silver

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What are the possible identities of metals X and Y?

Metalx MetalY

A Ca K

B Na Zn

C K Na

D Zn Ca

36. Element X forms an amphoteric oxide which cannot be

reduced by heating with carbon or hydrogen gas.

What is element X?

AZn BA/CCa DN/s ( )

37. Three metal carbonates, XC0,, YCO, and 2C0,, were eachheated using the setup as shown below:

metal

limervater

heat

0n mild heating of YC0,, white precipitate was observedforming in the limewater. Heating more strongly gave thesame observation for XC0, but not for ZCO..

Which of the following shows the correct order for thereactivity of metals X, Y and Z?

Least reactive ____________> Most reactive

A z Y x

B z x Y

C x Y z

D Y x z

38. Substance X has a high melting point above 1000"C. lt is

soluble in water. Substance X can only conduct electricity in

molten state. Which of the following could be X?

A Sulfur B Copper metalC Sodium chloride D lVagnesium metal

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39. Which of the following is the electronic configuration of a

metal with a high melting point?

A 2.1 B 2.8.1

c 283 D 2BB1 t )

Unit 15 I }**lcis ond R*asiivity Series 121

40. Which of the following metals can react explosively withchlorine gas to give a compound which when dissolved in

water is not detectable by the addition of either aqueousammonia 0r aqueous sodium hydroxide?

A Zinc B SodiumC Calcium D lVagnesium ( )

41. The steel hull of a ship is to be protected by sacrificialprotection to prevent corrosion. Which of the following wouldbe a suitable metal to be bolted onto the steel hull for theprotection?

A Silver B Sodium

C Aluminium D lVagnesium ( )

Substance X was heated strongly in a boiling tube over a

flame. A colourless and odourless gas was evolved, whichturned moist blue litmus paper red. The heated substance

was dissolved completely in excess dilute sulfuric acid. To

a portion of this solution, aqueous ammonia was added and

there was no vislble reaction.

What could be the identity of substance X?

AC

Na,C0

Ca(0H

B ZnC0,

D CaCO,

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43. lVetals X, Y and Z are obtained as follows:

lVetal X is obtained from electrolysis of its oxide.

lvetal Y is obtained by reduction of its oxide with carbon.lVetal Z is obtarned as rtself without the need for furtherref inement.

Which of the following shows the correct order of reactivityof the three metals?

Most reactive -----....----> Least reactive

A z Y x

B Y z x

C x Y z

D Y x z

A white powder was subjected to the following tests and theobservations recorded.

1. The powder was heated strongly. No gas was detected.2. Dilute sulfuric acid was added. Effervescence was

observed.3. Aqueous ammonia was added. No precipitate was

observed.4. Aqueous sodium hydroxide was added. No precipitate

was observed.

Which of the following could be the identity of the whitepowder?

A CaC0, B Na,C0,

C N/g(OH), D KN03 ( )

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122 Theme 4 I Feriodicity

The graphs below show the rates of reaction of three differentmetals, X, Y and Z, with dilute sulfuric acid.

Volume of gas evolved (cm3)

with metal X

with metal Y

with metal Z

Time (min)

What are the possible rdentities of metals X, Y and Z?

An alloy of two metals was dissolved in a small volumeof concentrated nitric acid, giving a blue solution. The

undissolved alloy was filtered off and the {iltrate diluted withdistilled water. Addition of excess iron filings to the dilutedsolution resulted in the precipitation of a pinkish metal and

the formation of a pale yellow solution. Addition of excess

aqueous sodium hydroxide to the resulting solution gave

a dirty-brown precipitate which was filtered off to leave

a colourless filtrate. To this colourless filtrate, additionof concentrated sulfuric acid dropwise did not give anyobservable reaction initially but resulted in the appearance

of a white precipitate after f urther addition of acid.

What are the two metals present in the alloy?

A Cu and Zn B Cu and A/C FeandCa D FeandCu ( )

Nl4847 Which of the following reactions will not take place easily?

A K(s)+ NaC/(aq) , KC/(aq)+ Na(s)

B Zn(s)+ Cu(N0,),(aq) - Cu(s) + Zn(N0,),(aO)

C 2AgN0,(aq) + Cu(s) - 2Ag(s)+ Cu(NO,),(ao)

D Nlg(s)+ Pb(N0,),(aO) - Pb(s) + lVg(N0,),(aq) ( )

CuA AI Fe

B It/g Zn Pb

C Na NIs Zn

D Ca AI Fe

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