Worksheetschemical reactions and equations
Total questions: 10
Worksheet time: 5mins
In which of the following process a chemical reaction has taken place?
Ice melts into water
A wet shirt got dried in sunlight
A brown layer is formed over iron rod kept in air
sugar getting dissolved in water
A chemical equation should be balanced to :
show conservation of energy
show conservation of mass
to make equation attractive
All of the above
Corrosion of iron is known as (a) .
Assertion: Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.
Reason: Zinc reacts with oxygen to form zinc oxide.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
Assertion is true but the reason is false.
The statement of the Assertion is false but the Reason is true.
CaO + H2O --> Ca(OH)2
This is an example of
Combination reaction
Decomposition reaction
Displacement reaction
None of the above
Rusting of iron is a physical change.
True
False
What is the process that is happening in this image ? And also give the name of the two gas that are present in two test tubes and the ratio they(gases) are present in .
process= thermal decomposition,
gases present=hydrogen,carbon dioxide, ratio=2:1
process=corrosion,
gases present=oxygen,hydroxide, ratio=2:1
process=electrolysis of hydrogen polyoxide
gases present=hydrogen,oxygen, ratio=2:1
process=electrolysis of water
gases present=hydrogen,oxygen,ratio=4:2
A solution of X is used for white washing walls. it reacts slowly with Y in air to form a thin layer of B on walls which gives walls a shiny finish. which of the following options correctly represents X,Y and B ?
X =slaked lime , Y = nitrogen , B=calcium oxide
X =Calcium Hydroxide, Y=Oxygen, B = Calcium carbonate
X= slaked lime, Y=Carbon oxide,B= calcium chloride
X= slaked lime,Y=Carbon dioxide,B=Calcium carbonate
Which of the following is not a physical change?
(a) Boiling of water to give water vapour
(b) Melting of ice to give water
(c) Dissolution of salt in water
(d) Combustion of Liquefied Petroleum Gas (LPG)
What are the substances on the left side called and right side of the chemical equation called respectively ?
products and reactants
groups and electrons
nothing
reactants and products
