Chemical Reactions

Total Questions: 16

1 - Carbon burns in air to release energy along with the formation of:
A ) Carbon dioxide ✅
B ) Carbon dioxide and water
C ) Carbon dioxide and hydrogen
D ) Carbon monoxide and hydrogen

2 - The products of the reaction between zinc and dilute sulphuric acid are:
A ) Zinc oxide and water
B ) Zinc sulphide and water
C ) Zinc sulphate and hydrogen ✅
D ) Zinc sulphide and hydrogen

3 - Heating of solid potassium chlorate produces a gas:
A ) Chlorine
B ) Carbon dioxide
C ) Carbon monoxide
D ) Oxygen ✅

4 - Which of the following is an exothermic reaction?
A ) Formation of iron sulphide by heating the mixture of iron and sulphur ✅
B ) Formation of nitric oxide by heating the mixture of nitrogen and oxygen
C ) Formation of hydrogen oxide by heating the mixture of hydrogen and iodine
D ) Formation of calcium oxide and carbon dioxide by heating calcium carbonate

5 - The reaction between calcium oxide and carbon dioxide to form calcium carbonate is an example of:
A ) Addition reaction ✅
B ) Decomposition reaction
C ) Acid base reaction
D ) Neutralization reaction

6 - Thermal dcomposition of calcium carbonate produces a gas.
A ) Oxygen
B ) Carbon dioxide ✅
C ) Nitrogen
D ) Carbon monoxide

7 - Substances which take part in a chemical reaction are called:
A ) Reactants ✅
B ) Products
C ) Celements
D ) Compounds

8 - During photosynthesis in plants , carbon dioxide and water react to produce:
A ) Glucose ✅
B ) Water
C ) Energy
D ) Carbon dioxide

9 - Symbols and formula of the reactants are written on _____ side of arrow.
A ) Left ✅
B ) Right
C ) Both side
D ) Upward

10 - The equation in which the number of atoms of each element on both sides are not equal is called:
A ) Quadratic equation
B ) Unbalanced equation ✅
C ) Balanced equation
D ) Standard equation

11 - Law of conservation of mass was put forward by:
A ) Einstein
B ) Newton
C ) Plank's
D ) Lavoisier ✅

12 - Law of conservation of mass put forward in:
A ) 1783
B ) 1784
C ) 1785 ✅
D ) 1786

13 - Fireworks is an example of ____ reactions.
A ) Exothermic ✅
B ) Addition
C ) Endothermic
D ) Decomposition

14 - During a chemical reaction, total mass of the product is equal to the total mass of reactants, This is a statement of:
A ) Law of conservation of momentum
B ) Law of conservation of energy
C ) Law of conservation of mass ✅
D ) Law of conservation of acceleration

15 - The chemical reaction during which a compound splits up into two or more simple substances is called:
A ) Addition reaction
B ) Decomposition ✅
C ) Replacement reaction
D ) Balanced reaction

16 - Exothermic reactions are those reactions during which heat is:
A ) Given out ✅
B ) Absorbed
C ) Remain same
D ) Used
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