ICSE ICSE Class 7 - CISCE Question Bank Solutions

Name the following:

The group of the Modern Periodic Table to which calcium [Ca²⁺] belongs.

The composition and properties of a _________ mixture is uniform throughout.

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Solvent extraction method

Give one word answer

The solid particles which remain on the filter paper after the filtration 

Select the correct alternative from the choices given for the following statement:

A pure liquid is obtained from a solution by :

 Differentiate between the following.

Supernatant liquid and Fill rate

 Differentiate between the following

Filter Paper  and Alum

Is food that we eat a mixture ?

Name two methods by which solid-solid mixtures can be separated.

Define the term pollutants.

What problems are caused by the presence of dust particles in excessive amount in the air?

What problems are caused by the presence of smoke particles in excessive amount in the air?

What problems are caused by the presence of sulphur dioxide gas in excessive amount in the air?

What problems are caused by the presence of  nitrogen dioxide gas in excessive amount in the air?

What problems are caused by the presence of carbon monoxide gas in excessive amount in the air?

What problems are caused by the presence of hydrorgen sulphide in excessive amount in the air?

Filtration is a method used to separate fine particles of solid from a liquid.

A separating funnel can be used for separating a mixture of immiscible liquids. True or false?

During centrifugation, solid particles of the mixture move towards the bottom. True or false?

Give a reason for the following statement:

If fractional distillation is carried out using a liquid-liquid mixture, one liquid will remain in the flask and the other will be collected in the receiver.