EASY
10th CBSE
IMPORTANT
Earn 100

A piece of granulated zinc was dropped into copper sulphate solution. After some time, the colour of the solution changed from

50% studentsanswered this correctly

Important Questions on Chemical Reactions and Equations

EASY
10th CBSE
IMPORTANT
SCIENCE CHEMISTRY Part-II>Chapter 1 - Chemical Reactions and Equations>Paper-Pen Test>Q 10

A student take some zinc granules in a test tube and adds dilute hydrochloric acid to it.

He would observe that the colour of zinc granules change to:

EASY
10th CBSE
IMPORTANT
SCIENCE CHEMISTRY Part-II>Chapter 1 - Chemical Reactions and Equations>Summative Assessment>Q 1
When iron is heated with sulphur, iron sulphide is formed. Name the reaction.
EASY
10th CBSE
IMPORTANT
SCIENCE CHEMISTRY Part-II>Chapter 1 - Chemical Reactions and Equations>Summative Assessment>Q 2
Aluminium metal displaces iron from ferric oxide Fe2O3 giving aluminium oxide and iron.
Which is more reactive, aluminium or iron?
EASY
10th CBSE
IMPORTANT
SCIENCE CHEMISTRY Part-II>Chapter 1 - Chemical Reactions and Equations>Summative Assessment>Q 3
The taste and smell of the food changes when kept for long time in the open. What is it called?
EASY
10th CBSE
IMPORTANT
SCIENCE CHEMISTRY Part-II>Chapter 1 - Chemical Reactions and Equations>Summative Assessment>Q 4
What is general name of the chemicals which are added to fat and oil containing foods to prevent the development of rancidity?
MEDIUM
10th CBSE
IMPORTANT
SCIENCE CHEMISTRY Part-II>Chapter 1 - Chemical Reactions and Equations>Summative Assessment>Q 5
A solution of a substance X' is used for white washing.
Name the substance 'X' and write its formula.
Write the reaction of the substance 'X' named above with water.
EASY
10th CBSE
IMPORTANT
SCIENCE CHEMISTRY Part-II>Chapter 1 - Chemical Reactions and Equations>Summative Assessment>Q 6
Write the balanced chemical equation to represent the following statements:
Carbon (coke) burns in air to form carbon dioxide.
EASY
10th CBSE
IMPORTANT
SCIENCE CHEMISTRY Part-II>Chapter 1 - Chemical Reactions and Equations>Summative Assessment>Q 6
A piece of sodium metal on putting in water forms caustic soda and hydrogen gas. Explain.