What defines an acid?

• A substance that releases hydroxide ions (OH-) when dissolved in water.

• A substance that releases hydrogen ions (H+) when dissolved in water, resulting in a pH less than 7.

• A substance that has a pH greater than 7.

• A substance that reacts with metals to produce oxygen gas.

What are the products when an acid reacts with a metal?

• Salt and water.

• Salt and carbon dioxide.

• Salt and hydrogen gas.

• Water and oxygen gas.

What color does litmus paper turn when exposed to an acid?

• Blue

• Yellow

• Colourless

• Red

Which statement accurately describes the relationship between bases and alkalis?

• All bases are alkalis.

• All alkalis are bases.

• Bases are always soluble in water, while alkalis are not.

• Alkalis are metal oxides, while bases are metal hydroxides.

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What are the products formed when a base reacts with an ammonium salt?

• Salt, water, and hydrogen gas

• Salt, water, and ammonia gas

• Acid, water, and ammonia gas

• Acid, salt, and hydrogen gas

How are acids and bases defined in terms of proton transfer?

• Acids are proton acceptors, and bases are proton donors.

• Acids are proton donors, and bases are proton acceptors.

• Acids and bases are both proton donors.

• Acids and bases are both proton acceptors.

What is the key difference between a strong acid and a weak acid in an aqueous solution?

• Strong acids partially dissociate, while weak acids completely dissociate.

• Strong acids completely dissociate, while weak acids partially dissociate.

• Strong acids produce more water, while weak acids produce less water.

• Strong acids are always organic, while weak acids are always inorganic.

What color does a universal indicator turn when a solution is neutral (pH 7)?

• Red

• Yellow

• Green

• Blue