When solid lead nitrate is heated, reddish-brown nitrogen gas is evolved with oxygen.

Precipitation is shown by upward arrow.

When carbon and sulphur are heated, energy in the form of heat is released.

Some chemical reactions take place only in the presence of heat.

Chlorophyll acts as a biocatalyst.

The enzymes involved at different stages of protein digestion are collectively known as proteases.

Maltase helps in conversion of maltose into glucose.

Hydrogen sulphide reacts with chlorine and gets oxidised to sulphur due to loss of hydrogen.

Ozone, chlorine and carbon are reducing agents.

How is acidity relieved?

When an ant or a bee stings, which of the following is injected into the body causing itching?

Slaked lime contains which of the following?

Calamine lotion contains which of the following?

Anjana has been bit by a bee. What immediate home remedy should she follow?

Zn(NO3)2 falls under which of the following categories?

Which of the following is a golden yellow precipitate?

What is the colour of iron (II) sulphate?