Reaction Types II: Displacement and Precipitation

Section A: Displacement Reactions

Question 1mcq

In

Zn + CuSO_4 \rightarrow ZnSO_4 + Cu

, zinc displaces copper because zinc is:

A.A non-metal only

B.More reactive than copper

C.Less reactive than copper

D.A gas

Question 2mcq

Which reaction is a displacement reaction?

A.

Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl

B.

CaO + H_2O \rightarrow Ca(OH)_2

C.

CaCO_3 \rightarrow CaO + CO_2

D.

Fe + CuSO_4 \rightarrow FeSO_4 + Cu

Question 3mcq

What is observed when iron nails are kept in copper sulphate solution for some time?

A.The solution becomes pure water

B.No reaction is possible because iron is less reactive

C.A white precipitate of

AgCl

forms

D.A reddish-brown coating of copper forms on iron

Question 4mcq

Which metal cannot displace zinc from

ZnSO_4

solution?

A.Calcium

B.Copper

C.Aluminium

D.Magnesium

Question 5mcq

Classify:

Cu + 2AgNO_3 \rightarrow Cu(NO_3)_2 + 2Ag

.

A.Displacement reaction

B.Thermal decomposition

C.Combination reaction

D.Neutralisation only

Question 6mcq

If metal

X

displaces metal

Y

from

YSO_4

, then:

A.

Y

is more reactive than

X

B.

X

is more reactive than

Y

C.No reaction has occurred

D.Both metals must be gases

Section B: Double Displacement and Precipitation

Question 7mcq

A double displacement reaction usually involves:

A.One reactant breaking into many products

B.Only one element replacing another

C.Exchange of ions between two compounds

D.Two elements forming one compound only

Question 8mcq

Which product is the precipitate in

Pb(NO_3)_2 + 2KI \rightarrow PbI_2 + 2KNO_3

?

A.

KNO_3

B.

PbI_2

C.

Pb(NO_3)_2

D.

KI

Question 9mcq

Classify:

Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl

.

A.Single displacement reaction

B.Double displacement reaction

C.Combination reaction

D.Decomposition reaction

Question 10mcq

Which observation most strongly suggests a precipitation reaction?

A.An insoluble solid appears when two solutions are mixed

B.A gas condenses on a cold surface

C.A solid melts on heating

D.A liquid evaporates completely

Question 11mcq

Which equation represents a precipitation reaction?

A.

2Mg+O_2\rightarrow2MgO

B.

AgNO_3(aq)+NaCl(aq)\rightarrow AgCl(s)+NaNO_3(aq)

C.

CH_4+2O_2\rightarrow CO_2+2H_2O

D.

CaCO_3\rightarrow CaO+CO_2

Question 12mcq

In a precipitation reaction, the symbol

(s)

beside a product usually tells us the product is:

A.An aqueous solution

B.An insoluble solid

C.A catalyst

D.A gas