Final Assessment: Acids, Bases and Salts

Section A: Full Chapter Review

Question 1mcq

An acid furnishes which ion in aqueous solution?

A.

OH^-

B.

Na^+

C.

Cl^-

D.

H^+

Question 2mcq

A base furnishes which ion in aqueous solution?

A.

CO_3^{2-}

B.

H^+

C.

OH^-

D.

Cl^-

Question 3mcq

A strong acid is one that:

A.Is always highly concentrated

B.Has a dark colour

C.Has no ions

D.Ionises almost completely in water

Question 4mcq

A weak acid is one that:

A.Ionises partially in water

B.Contains no hydrogen

C.Always has pH 7

D.Cannot be concentrated

Question 5mcq

Blue litmus turns red in:

A.Salt crystals only

B.Basic solution

C.Acidic solution

D.Neutral water

Question 6mcq

Red litmus turns blue in:

A.Acidic solution

B.Sugar solution always

C.Neutral solution

D.Basic solution

Question 7mcq

Universal indicator showing red/orange suggests the solution is:

A.Acidic

B.Neutral only

C.Strongly basic

D.Always salty

Question 8mcq

Universal indicator showing green usually means pH is close to:

A.0

B.1

C.13

D.7

Question 9mcq

Acid reacting with an active metal usually produces:

A.Chlorine gas

B.Hydrogen gas

C.Oxygen gas

D.Nitrogen gas

Question 10mcq

Hydrogen gas burns with a:

A.Milky colour

B.Pop sound

C.Vinegar smell

D.Blue precipitate

Question 11mcq

Acid + base generally gives:

A.Metal + water

B.Carbonate + oxygen

C.Salt + water

D.Salt + hydrogen

Question 12mcq

Which equation represents neutralisation?

A.

2H_2 + O_2 \rightarrow 2H_2O

B.

CaCO_3 \rightarrow CaO + CO_2

C.

HCl + NaOH \rightarrow NaCl + H_2O

D.

Zn + HCl \rightarrow ZnCl_2 + H_2

Question 13mcq

An alkali is a base that is:

A.Soluble in water

B.Always a metal

C.Insoluble in water

D.Always an acid

Question 14mcq

In a lab, students should test bases by:

A.Tasting every base

B.Using safe indicators, not tasting

C.Mixing unknowns freely

D.Rubbing bases on skin

Question 15mcq

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 16mcq

Which equation shows sodium hydroxide neutralising hydrochloric acid?

A.

NaOH \rightarrow Na + OH

B.

NaOH + HCl \rightarrow NaCl + H_2O

C.

HCl \rightarrow H_2 + Cl_2

D.

NaOH + HCl \rightarrow NaH + Cl_2

Question 17mcq

A solution with pH 7 is:

A.Always poisonous

B.Strongly basic

C.Neutral

D.Strongly acidic

Question 18mcq

A solution with pH 3 is:

A.Basic

B.Acidic

C.Neutral

D.Alkaline only

Question 19mcq

The acid in our stomach is mainly:

A.Hydrochloric acid

B.Acetic acid

C.Carbonic acid

D.Nitric acid in large quantity

Question 20mcq

Antacids help because they are:

A.Indicators only

B.Strong acids

C.Mild bases that neutralise excess stomach acid

D.Neutral gases

Question 21mcq

The chlor-alkali process is electrolysis of aqueous:

A.

NaHCO_3

B.

NaCl

C.

CaSO_4

D.

Na_2CO_3

Question 22mcq

Which gas is formed at the cathode in the chlor-alkali process?

A.

H_2

B.

CO_2

C.

Cl_2

D.

O_2

Question 23mcq

Bleaching powder is commonly represented as:

A.

NaHCO_3

B.

CaSO_4 \cdot rac{1}{2}H_2O

C.

Na_2CO_3 \cdot 10H_2O

D.

CaOCl_2

Question 24mcq

Bleaching powder is prepared by passing chlorine over:

A.Dry slaked lime

B.Baking soda

C.Gypsum

D.Washing soda

Question 25mcq

Baking soda is:

A.

Na_2CO_3 \cdot 10H_2O

B.

CaOCl_2

C.

NaHCO_3

D.

NaCl

Question 26mcq

Baking soda helps cakes rise because it releases:

A.

CO_2

B.

H_2

C.

Cl_2

D.

O_2

Question 27mcq

Plaster of Paris has the formula:

A.

NaHCO_3

B.

CaSO_4 \cdot 2H_2O

C.

CaOCl_2

D.

CaSO_4 \cdot rac{1}{2}H_2O

Question 28mcq

Gypsum is:

A.

NaCl

B.

CaSO_4 \cdot 2H_2O

C.

Na_2CO_3

D.

CaSO_4 \cdot rac{1}{2}H_2O

Question 29mcq

Which equation is balanced?

A.

HCl + CaCO_3 \rightarrow CaCl + CO_2

B.

2HCl + CaCO_3 \rightarrow CaCl_2 + H_2O + CO_2

C.

HCl + CaCO_3 \rightarrow CaCl_2 + H_2O

D.

2HCl + CaCO_3 \rightarrow CaCl_2 + H_2

Question 30mcq

Which equation shows neutralisation correctly?

A.

NaOH + HNO_3 \rightarrow NaNO_3 + H_2O

B.

NaOH + HNO_3 \rightarrow NaH + NO_3

C.

NaOH + HNO_3 \rightarrow NaNO_2 + H_2

D.

NaOH \rightarrow Na + OH

Question 31mcq

Which correction is true?

A.Dilute means always weak

B.Strong means more volume

C.Concentrated means no water

D.Strong/weak is about ionisation; concentrated/dilute is about amount dissolved

Question 32mcq

Which statement is correct?

A.All alkalis are bases, but not all bases are alkalis

B.All bases are soluble

C.Alkalis are insoluble acids

D.All acids are alkalis

Question 33mcq

Antacids are used to relieve acidity because they are:

A.Strong acids

B.Mild bases

C.Neutral gases

D.Indicators

Question 34mcq

Toothpaste is often basic to:

A.Make mouth pH zero

B.Produce more sugar

C.Neutralise acids in the mouth

D.Remove all saliva

Question 35mcq

Acidic soil can be treated by adding:

A.More acid

B.Vinegar

C.Lime

D.Common salt only

Question 36mcq

Sudden pH change in water bodies harms aquatic life because organisms:

A.Need a suitable pH range

B.Live only at pH 0

C.Are not affected by pH

D.Use pH as food

Question 37mcq

The chlor-alkali process produces

NaOH

,

Cl_2

and:

A.

NH_3

B.

O_2

only

C.

H_2

D.

CO_2

Question 38mcq

Bleaching powder is used for:

A.Making cakes rise

B.Treating acidity directly

C.Disinfecting water

D.Making plaster casts

Question 39mcq

Which use is correctly matched?

A.Baking soda — bleaching cloth

B.Bleaching powder — making bread rise

C.POP — disinfecting water

D.Washing soda — softening hard water

Question 40mcq

Which balanced equation shows acid reacting with hydrogen carbonate?

A.

HCl + NaOH \rightarrow NaCl + H_2O

B.

NaHCO_3 + HCl \rightarrow NaCl + H_2

C.

NaHCO_3 \rightarrow NaOH + CO_2

D.

NaHCO_3 + HCl \rightarrow NaCl + H_2O + CO_2