Chemical properties of acids and bases

The colour of phenolphthalein indicator in basic solution is:

What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases.
(ii) The temperature of the solution decreases.
(iii) The temperature of the solution remains the same.
(iv) Salt formation takes place.

Metallic oxides are ______ in nature, but non-metallic oxides are ______ in nature. The information in which alternative completes the given statement is:

Which of the following indicators is an olfactory indicator?

The gas evolved when aluminium powder is mixed with sodium hydroxide solution is:

The chemical used in fire extinguishers is

The chemical equation that represents neutralization reaction among the following is

Which substance when used with butter having butyric acid can cure acidity

A diagram of the reaction of Zinc with acid is given below.

During this reaction, a gas is evolved. Write the name of the gas. (Sulphur dioxide/ Hydrogen)

NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O is the example of a _____  reaction.

The reaction between an acid and a base to give a salt and water is known as a _____ reaction.

_____ are the substances that give different colour in acidic or basic solutions.

Acids react with bases to form _____ and water.

_____ are the compounds that give hydroxide ion in water solution.

When magnesium and hydrochloric acid react, they produce_____________.

_____ are the compounds that give hydrogen ion in water solution.

What gas is produced when magnesium is made to react with hydrochloric acid?

The colour of methyl orange indicator in acidic medium is

A compound A reacts with acid ${\mathrm{H}}_2{\mathrm{SO}}_4$ and releases gas B with brisk effervescence. On heating, gas B burns with a pop sound. Tell names of A and B and give the equation of the reaction.

What happens when curd or sour substances are kept in metal utensils.