ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

Name the following:

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

Name the following:

A catalyst which increases the rate of a chemical reaction.

Fill in the blanks:

Matter is defined as anything that occupies _______ and has _______

Fill in the blank:

The three states of matter are classified on the basis of differences of certain _________.

Fill in the blank:

Particles in a gas possess ___________ kinetic energy.

Fill in the blank:

The intermolecular force of attraction is ___________ in solids.

Give reason for the following:

Silver salts are kept in dark coloured bottles.

Write word equation for the following chemical reaction given below. Also state the observation seen in the case.

\[\ce{ZnCo3->[\triangle] ZnO + CO2}\]

Give a reason for the following:

Liquids have one free upper surface only.

Write word equation for the following chemical reaction given below. Also state the observation seen in the case.

NaCl + AgNo₃ → AgCU ↓ + NaN0₃

Write word equation for the following chemical reaction given below. Also state the observation seen in the case.

\[\ce{Na2SO3 + 2HCl ->[\triangle] 2NaCl + H2O + SO2}\]

Write word equation for the following chemical reaction given below. Also state the observation seen in the case.

Pb(NO3)₂ + 2NH₄OH → 2NH₄N0₃ + Pb(OH)_2↓

Write word equation for the following chemical reaction given below. Also state the observation seen in the case.

\[\ce{2SO2 + O2 ⇌[V2O5][450°C] 2SO3}\]

Give a reason why oiling or greasing is done on the exposed moving iron parts of machinery and not preferred on heavy stationary iron parts.

State why galvanization, tinning and chromeplating are used as three different processes for coating specific articles for prevention of rusting.

State a specific reason for using zinc in galvanizing

State a specific reason for using lead in bullets

State a specific reason for using magnesium in fireworks.

Give reason for the following:

Galvanized steel is not used for articles used for edible applications.

Give word equation for the reaction of Non-metal:

Sulphur