MEDIUM
8th CBSE
IMPORTANT
Earn 100
The oxide formed by the chemical reaction of hydrogen and oxygen is acidic in nature.
Important Questions on Materials : Metals and Non-Metals
MEDIUM
8th CBSE
IMPORTANT
Water is an example of a basic oxide.
HARD
8th CBSE
IMPORTANT
(a) What do you understand by the term metal activity series?
(b)Which metals amongst the following can displace hydrogen from the acid
i)Copper ii) zinc iii) magnesium iv) silver
HARD
8th CBSE
IMPORTANT
Write equations for the following reactions :
(a) Aluminium and dilute hydrochloric.
b) Zinc and sodium hydroxide solution
(c) Sulphur and concentrated nitric acid
(d) Sulphur dioxide gas and water
(e) Heated iron and steam.
MEDIUM
8th CBSE
IMPORTANT
Why are pickles not stored in an aluminium can?
HARD
8th CBSE
IMPORTANT
A boy introduced red-hot charcoal into a gas jar and covered it with a glass lid to collect the gas evolved. Explain:
Write a word equation in support of your answer?
HARD
8th CBSE
IMPORTANT
When the gold ornaments are sent to a jeweller for polishing, they always lose small amount of weight. Explain how does this happen?
