Homework Practice

Printable assignment

Indicator Detective: Acids, Bases and Neutrals

Section A: Litmus and Natural Indicators

Question 1mcq

Blue litmus turns red in:

A.Neutral water

B.Salt crystals only

C.Acidic solution

D.Basic solution

Question 2mcq

Red litmus turns blue in:

A.Basic solution

B.Sugar solution always

C.Acidic solution

D.Neutral solution

Question 3mcq

A solution does not change red or blue litmus. It is most likely:

A.Neutral

B.Strongly basic

C.Always poisonous

D.Strongly acidic

Question 4mcq

Turmeric stain usually turns reddish-brown with:

A.Neutral water only

B.Distilled water only

C.Acidic lemon juice only

D.Basic solution

Question 5mcq

China rose indicator turning green suggests the solution is:

A.No solution present

B.Acidic

C.Neutral

D.Basic

Question 6mcq

Lemon juice will most likely turn blue litmus:

A.Colourless

B.Blue

C.Red

D.Green

Section B: Universal Indicator and Safe Testing

Question 7mcq

Universal indicator showing red/orange suggests the solution is:

A.Neutral only

B.Acidic

C.Always salty

D.Strongly basic

Question 8mcq

Universal indicator showing green usually means pH is close to:

A.13

B.0

C.1

D.7

Question 9mcq

Soap solution is usually:

A.Basic

B.Neutral like pure water

C.Always a salt

D.Strongly acidic

Question 10mcq

Vinegar is classified as:

A.Acidic

B.Basic

C.Neutral

D.Metallic

Question 11mcq

The safest first step when testing an unknown liquid is to:

A.Taste it

B.Mix all unknowns together

C.Smell it deeply

D.Use a small sample and avoid tasting or touching it

Question 12mcq

A solution with pH about 10 is:

A.Basic

B.Acidic

C.Not a solution

D.Neutral