Chemical indicators

The color of the universal indicator strip does not change with _________

• magnesium hydroxide.

• distilled water.

• sulphuric acid.

• lemon juice.

Among the basic gases is __________

• NH₃

• H₂

• CO₂

• O₂

On dissolving CO₂ gas in water, a solution is formed that changes the color of the universal indicator strip. What is the type of the formed solution?

• Acidic, OH^-

• Alkaline, OH^-

• Acidic, H⁺

• Alkaline, H⁺

What are the two substances that can be differentiated by using a blue litmus strip wetted with water?

• Nitric acid and acetic acid.

• O₂, H₂ gases.

• N₂, CO₂ gases.

• Potassium hydroxide and calcium hydroxide

Chemical substances whose color differs in acidic medium from that in alkaline medium

(a)  

An indicator that can differentiate between the different acids or the different alkalis according to their strength

(a)  

(a)   gas removes the color of the blue litmus strip wetted with water

Carbon dioxide gas changes the color of the ________litmus strip to ______ color

(a)  

Mention two examples of :

chemical indicators

(a)  

Mention an example of:

A gas that doesn't change the color of indicators

(a)