Acids and Bases Reactions Quiz

What happens to red litmus paper when HCl is added?

• It turns blue

• It remains red

• It turns green

• It turns yellow

What color change occurs when HCl is added to blue litmus solution?

• Red to blue

• Blue to red

• Blue to green

• No change

What is the pH value of NaOH?

• Less than 7

• More than 7

• Equal to 7

• Exactly 7

What happens to red litmus paper when NaOH is added?

• It turns yellow

• It turns green

• It remains red

• It turns blue

What gas is evolved when HCl reacts with zinc metal?

• Nitrogen

• Hydrogen

• Carbon dioxide

• Oxygen

What sound is produced when hydrogen gas is ignited?

• A hissing sound

• A whistling sound

• A popping sound

• No sound

What gas is evolved when NaOH reacts with zinc metal?

• Nitrogen

• Oxygen

• Carbon dioxide

• Hydrogen

What happens to lime water when CO2 is passed through it?

• It turns blue

• It turns milky

• It remains unchanged

• It turns clear

What color does phenolphthalein turn in an alkaline solution?

• Blue

• Red

• Pink

• Green

What is the result of mixing NaOH with sodium carbonate?

• No reaction

• An alkaline solution

• An acidic solution

• A neutral solution