Base Chemistry: Alkalis, Neutralisation and Safe Clues

Section A: Properties of Bases and Alkalis

Question 1mcq

An alkali is a base that is:

A.Always a metal

B.Insoluble in water

C.Always an acid

D.Soluble in water

Question 2mcq

In a lab, students should test bases by:

A.Rubbing bases on skin

B.Using safe indicators, not tasting

C.Tasting every base

D.Mixing unknowns freely

Question 3mcq

Alkalis commonly produce which ions in water?

A.

Cl^-

B.

OH^-

C.

H^+

D.

CO_2

Question 4mcq

Which is an alkali?

A.Dry ice

B.

NaOH(aq)

C.Insoluble

CuO

D.Sand

Question 5mcq

Why is bitter taste not a safe test for bases?

A.Taste gives exact pH

B.Bases can be harmful or corrosive

C.Only acids harm skin

D.Bases are always food

Question 6mcq

A concentrated base solution means:

A.The base has no ions

B.More base is dissolved per given amount of solution

C.It is neutral

D.The base must be weak

Section B: Neutralisation and Sodium Hydroxide

Question 7mcq

A base neutralises an acid to form:

A.Salt and hydrogen gas always

B.Salt and water

C.Metal only

D.Carbon dioxide only

Question 8mcq

Which equation shows sodium hydroxide neutralising hydrochloric acid?

A.

HCl \rightarrow H_2 + Cl_2

B.

NaOH \rightarrow Na + OH

C.

NaOH + HCl \rightarrow NaCl + H_2O

D.

NaOH + HCl \rightarrow NaH + Cl_2

Question 9mcq

Certain metals such as zinc react with strong bases to release:

A.Carbon dioxide

B.Nitrogen

C.Hydrogen gas

D.Oxygen only

Question 10mcq

Which equation can represent zinc reacting with sodium hydroxide?

A.

Zn + HCl \rightarrow ZnCl_2 + H_2O

B.

2NaOH + Zn \rightarrow Na_2ZnO_2 + H_2

C.

NaOH + H_2 \rightarrow NaH + H_2O

D.

NaOH + Zn \rightarrow NaCl + H_2

Question 11mcq

During neutralisation,

OH^-

ions combine with

H^+

ions to form:

A.

H_2

B.

NaCl

only

C.

H_2O

D.

CO_2

Question 12mcq

The ionic equation for neutralisation is:

A.

H^+ + OH^- \rightarrow H_2O

B.

O_2 + H_2 \rightarrow CO_2

C.

Na^+ + Cl^- \rightarrow NaCl

D.

CO_2 + H_2O \rightarrow HCl