(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

Name or state the following:

An equation used in chemical calculations which gives a simultaneous effect of changes of temperature and pressure on the volume of a given mass of dry gas

Name or state the following:

The standard pressure of a gas in cm. of mercury corresponding to one atmospheric pressure.

Name or state the following:

The absolute temperature value corresponding to 35°C.

Give reason for the following:

Temperature remaining constant the product of the vol. & the press, of a given mass of dry gas is a constant.

Give reason for the following:

Volumes of gases are converted into s.t.p. conditions and then compared.

State the meaning of the term ‘water pollution’. State how you would find out, the different sources of pollution of water bodies in the locality.

Household detergents contain mainly ______ and pollute water bodies.

Fill in the blank:

The type of water softened by addition of washing soda is ______.

Fill in the blank:

Unpolluted water has _____ amount of dissolved oxygen.

Fill in the blank:

The sample of hard water which lathers with soap after boiling and filtration contains _____.

Name one substance which is ‘deliquescent’.

Name a deliquescent substance’.

Explain the following observation:

Washing-soda become coated with a white powder when left exposed to the atmosphere.

Define ‘eutrophication’.

What is meant by the term ‘oil spill’?

State any two sources of water pollution.

State the causes of ‘eutrophication’.

What is meant by the term ‘offshore drilling’. State the main environmental effects of offshore drilling.

Five atoms are labelled V to Z

1. Which one of these atoms 
   (1) contains 7 protons;
   (2) has an electronic configuration 2, 7?
2. Write down the formula of the compound formed by atoms X and Y.

Explain why oil spills have an adverse effect on marine life.