Physical And Chemical Changes

Front

How many types of chemical reactions are there?

Back

5

Front

The following reaction is:-

K + MgCl -> KCl+Mg

Options: Double displacement reaction, Single Displacement reaction, Redox reaction, This reaction is not possible

Back

This reaction is not possible

Front

When hydrogen is added or oxygen is removed, it is

Back

Reduction

Front

In an experiment, a painted iron nail was placed into a beaker containing sea water and left undisturbed for about 10 days. After 10 days, the nail began to rust. Which of the following is/are correct? i) Poor quality paint was used ii) Oxygen and water cause rusting iii) Presence of salts in sea water enables rust formation faster.

Back

All of these

Front

In neutralization reaction, acid reacts with a base to form salt and water and a lot of heat energy is given out. This reaction is:

Back

an exothermic chemical change

Front

During a chemical change in a reaction, what remains constant?

Back

mass remains constant

Front

What is galvanisation?

Back

process of depositing a thin layer of zinc metal on iron object

Front

The following experiment is: galvanisation, rusting of metal, displacement reaction, decomposition reaction

Back

displacement reaction

Front

________ are the purest solid form of a substance with a definite geometrical shape.

Identify it...

Options: Crystal, Crystals, crystals, crystal

Back

Crystal, Crystals, crystals, crystal