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Online Tests
Science 8th Class English Medium Chapter 6 Online Test MCQs With Answers
Question # 1
When methane is burnt in air, CO2 and.......... are formed.
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O2
H2O
Glucose
Energy
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Question # 2
Substancs whihc take part in a chemical reaction are called.
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Products
Ractants
Elements
Compunds
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Question # 3
How many oxygen atoms are present in onw molecule of Mg(HCO3)2
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2
4
6
8
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Question # 4
Carbon burns in air to release energy along with the formation of.
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Carbon dioxide and hydrogen
Carbon monoxide and hydrogen
Carbon di oxide
Carbon dioixe and water
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Question # 5
The reaction between calcium oxide and carbon dioxide to form calcium carbonate is an example of.
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Decomposition reaction
Addition reaction
Acid-Base reaction
Neutralizaion reaction
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Question # 6
Symbol and formulae of the reactants are written on....... side fo arrow.
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Left
Right
Upward
Both side
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Question # 7
Fire works is an example of ........... reactions.
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Addition
Exothermic
Endothermic
Decomposition
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Question # 8
The equation in which the number of atoms of each element on both sides are not equal is called.
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Quadratic equation
Unbalanced equation
Balanced equation
Standard equation
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Question # 9
During photosynthesis in plants, carbon dioxide CO2 and water react to produce.
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Water
Energy
Glucoe
CO2
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Question # 10
Law fo conservation of mass was put forward by
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Newton
Plank's
Lavoisier
Einstein
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Question # 11
Heating of solid potassium chlorate produces a gas.
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Chlorine
Carbon dioxide
Carbon mono oxide
Oxygen
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Question # 12
During a chemical reaction, total mass of the product is equal to the total mass of reactants, this is a statements of.
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Law of conservation of momentum
Law of conservation of energy
Law of conseration of mass
Law of conseration of acceleration
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Question # 13
Thermal decompositionof calcium carbonate produces a gas.
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Oxygen
Carbon di oxide
Nitrogen
Carbon monoxide
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Question # 14
Exothermic reaction ae those reactions durng which heat is.
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Given out
Remain same
Absorbed
Used
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Question # 15
Law of conservation of mass put forward in.
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1783
1784
1785
1786
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Question # 16
The chemicla reaction during which a compound splits up into two or more simple substanes, is called.
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Additon reaction
Decomposition
Replacement reaction
Balanced reaction
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Question # 17
The product fo the reaction between zinc and dilute sulphuric acid are.
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Zinc oxide and water
Zinc sulphide and water
Zinc sulphate and hydrogen
Zinc sulphide and hydrogen
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