MEDIUM
10th CBSE
IMPORTANT
Earn 100

Name the reducing agent in the following reaction:
State which is more reactive, Mn or Al and why?

Important Questions on Chemical Reactions and Equations
MEDIUM
10th CBSE
IMPORTANT
When a metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
(a) Name any two metals which can behave like metal X.
(b) Name any two acids which can behave like acid Y.
(c) Name gas Z.
(d) Is the reaction between metal X and dilute acid Y exothermic or endothermic.

MEDIUM
10th CBSE
IMPORTANT
In the following reaction between lead sulphide and hydrogen peroxide:
Name the substance reduced and oxidised.

MEDIUM
10th CBSE
IMPORTANT
List two observations that are noticed when an iron nail is put inside a copper sulphate solution. Write the chemical equation for the reaction that occurs.

HARD
10th CBSE
IMPORTANT
When water is added to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of the house during whitewashing. A clear solution of Y is also used for testing gas in the laboratory.
(a) Identify the solid X and write its chemical formula.
(b) Identify product Y and write its chemical formula.
(c) What is the common name of the solution of Y which is used for testing carbon dioxide gas?
(d) Write the chemical equation of the reaction which takes place on adding water to solid X.

MEDIUM
10th CBSE
IMPORTANT
Explain corrosion with an example. List four different ways that are used to prevent corrosion.

MEDIUM
10th CBSE
IMPORTANT
What are the two methods which can prevent the rancidity of fatty foods?

EASY
10th CBSE
IMPORTANT
Why the chips manufacturers usually flush bags of chips with nitrogen gas?

EASY
10th CBSE
IMPORTANT
Explain two ways by which food industries prevent rancidity.
