MEDIUM
7th ICSE
IMPORTANT
Earn 100

Give a word equation for the following reaction:

An exothermic reaction where both the reactants are gases, one of which is oxygen.

Important Questions on Language of Chemistry

MEDIUM
7th ICSE
IMPORTANT

Name the following:

The silvery residue obtained on heating mercury II oxide.

MEDIUM
7th ICSE
IMPORTANT
Name the gas evolved when a dilute acid is added to chalk [limestone].
MEDIUM
7th ICSE
IMPORTANT

Name the following:

Two non-metals react explosively when brought into close contact.

MEDIUM
7th ICSE
IMPORTANT

Name the following:

Two gases react under pressure in presence of a catalyst at elevated temperatures to give a gaseous product.

MEDIUM
7th ICSE
IMPORTANT

Name the following:

A catalyst increases the rate of a chemical reaction. [This catalyst is the compound of Manganese]

MEDIUM
7th ICSE
IMPORTANT

Give reason for the following:

Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts are unnoticeable.

MEDIUM
7th ICSE
IMPORTANT

Give reason for the following:

Electrolytic decomposition of water is a reaction involving change of state.

EASY
7th ICSE
IMPORTANT

Give reason for the following:

A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.