IS_Unit9_Unit_exercise_E

A1. Both acids and alkalis can conduct electricity when dissolved in water.

• True

• False

A2. A solution with a higher pH value is more acidic than one with a lower pH value.

• True

• False

A3. Adding water to an alkali can neutralize the alkali.

• True

• False

A4. Strong alkalis are much more corrosive than strong acids.

• True

• False

A5. We should handle concentrated acids and alkalis in a fume cupboard.

• True

• False

B1. Which of the following is a common property of acids?

• They have a slippery feel.

• They turn red litmus paper blue.

• They have a pH value less than 7.

• They react with alkalis to produce a saltand hydrogen.

B2. Which of the following substances has a pH value less than 7?

• Distilled water

• Rainwater

• Limewater

• Toothpaste

B3. Answer the following question.

• A

• B

• C

• D

B4. Which of the following can be used to find the pH value of a substance?

(1) Litmus paper

(2) Universal indicator

(3) pH meter

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

B5. Answer the following question.

• A

• B

• C

• D