ICSE ICSE Class 8 - CISCE Question Bank Solutions

 What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.

Name three biochemical catalysts found in the human body.

MATCH THE COLUMNAS

TRUE \ FALSE

Elements combine in definite proportions to form compounds.

TRUE \ FALSE

Elements having a tendency to accept electrons are called metals

TRUE \ FALSE

Neils Bohr gave the theory to explain the arrangement of protons in an atom.

TRUE \ FALSE

Cathode rays are a stream of fast moving particles that travel in random directions.

WRITE SHORT ANSWER

Define an ionic compound.

WRITE SHORT ANSWER

What is radioactivity?

WRITE SHORT ANSWER

Name three inert gases.

ANSWER IN DETAIL

State the postulates of the Dalton’s atomic theory.

ANSWER IN DETAIL

Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?

Complete and balance the following chemical equations:

N₂ + O₂  →

Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  

Complete and balance the following chemical equations

Na + H₂ O →

ANSWER IN DETAIL

How are isobars different from isotopes ?

Complete and balance the following chemical equations

NaCI + `AgNO_3`  `→`

Complete and balance the following chemical equations:

Zn + `"H"_2"SO"_4`  `→`

           (dil)

State what you would observe when the following substance  are heated in a glass test tube:
Red lead

State what you would observe when the following substances are heated in a glass test tube:
Copper (II) carbonate