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WorksheetsPhysical and Chemical changes & Soil
Total questions: 27
Worksheet time: 17mins
The chemical formula for Magnesium Oxide ?
( Mgo2 ]
[ Mg ( OH)2 ]
[ MgO]
Which of the following processes is used to prevent articles from rusting?
Crystallization
Digestion
Galvanization
Magnetic Effect
What is stainless steel mixed with so that it does not rust ?
Brass
Silver
Iron
Copper
Which one of the following is a chemical change ?
Twinkling of stars
Cooking of vegetables
Cutting of roots
Boiling of water
Crystallization is a process to obtain -
Pure solids
Pure liquids
Candies
Solids and powder
Equation for reaction between carbon dioxide and lime water :
Carbon Dioxide + Lime Water = Carbon Monoxide
Carbon Dioxide + Lime Water = Calcium Carbonate
Carbon Dioxide + Lime Water = Magnesium Hydroxide
Carbon Dioxide + Lime Water = Aqueous Solution
What is galvanisation ?
The process of depositing iron over steel
The process of depositing manganese over iron to prevent from rusting
The process of depositing a layer of nickel over zinc
The process of depositing a layer of zinc over iron
Is neutrilisation a chemical change ?
Yes
No
After blowing out C02 through mouth into limewater it changes to which colour -
(a)
Which gas is evolved when vinegar reacts with baking soda
Oxygen
Nitrogen
Carbon Dioxide
Hydrogen
Formula of rust is :
Fe2o3
Fe2o4
Fe0
Fe2o3.xH2O
Some substances can be obtained in pure state from their solution by the process of :
Galvanisation
Rusting
Crystallisation
What is the colour of Iron sulphate solution?
Blue
Green
Yellow
Red
When carbon dioxide is passed through lime water , it turns ——————-
Green
Blue
Milky white
Brown
Neutralisation is a :
Physical change
Chemical change
Both
None of them
soil is important for
agriculture
food
plants
All of the above
Which of the following best describes soil erosion?
A. the breakdown of soil
B. the improvement of soil
C. the addition of soil
D. the movement of soil by wind or water
All of the layers of soil together can be called a _________.
profile
horizon
row
layer
Which one of the following is a step in the formation of soil?
Earthquakes or volcanic eruptions
Earthquakes or volcanic eruptions
Addition of humus
All are involved in the formation of soil
Polythene bags and plastics pollute the soil.
True
False
Clayey soil is used for making pots, toys and statues.
true
false
