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

Balance the following important equation:

S + H₂SO₄ (conc.) → SO₂ + H₂O 

Balance the following important equation:

Cu + H₂SO₄ (conc.) → CuSO₄ + H₂O + SO₂  

What causes the temporary and permanent hardness of water?

Choose the correct answer from the option given below.

Modern atomic symbols are based on the method proposed by

Choose the correct answer from the option given below.

Modern atomic symbols are based on the method proposed by

What do you understand by

Temporary hard water

What do you understand by

Permanent hard water

What are the causes for:

Temporary hardness

What are the causes for

Permanent hardness

Name the substance which makes water temporarily hard

Name the substance which makes water permanently hard.

Explain with equation, what is noticed when permanent hard water is treated with

Slaked time

Define the term:

Mass number

Define the term:

Mass number

Explain the following:

An element has atoms with different mass numbers.  

Explain the following:

An element has atoms with different mass numbers.