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Class X >> Science >> Chemical Reactions and Equations >> A1

Q1	Which of the following is an example of chemical reaction ?
A	Fermentation of Sugars
B	Respiration
C	Digestion of Food
D	All of the Above

Q2	Representation of chemical reaction using symbols of substances is called __________.
A	Chemical Equilibrium
B	Chemical Equation
C	Chemical Energy
D	Chemical Changes

Q3	When a magnesium ribbon is burnt in oxygen, it gets converted to __________.
A	Magnesium Oxide
B	Magnesium Peroxide
C	Magnesium Carbonate
D	Dimagnesium Oxide

Q4	Substances which take part in a chemical reaction are called __________.
A	Oxidising Agent
B	Chemical Equation
C	Reactants
D	Product

Q5	New substance formed after a chemical reaction is called __________.
A	Oxidising Agent
B	Reducing Agent
C	Reactant
D	Product

Q6	Which observation helps us to determine whether a chemical reaction has taken place?
A	Change in Colour and Temperature
B	Evolution of Gas
C	Evolution or Absorption of Heat
D	All of the Above

Q7	In a balanced equation, the number of atoms of each element are found to be __________ before and after a chemical reaction.
A	Same
B	Unequal
C	More
D	Less

Q8	Whenever a chemical change occurs, we can say that a __________ reaction has taken place.
A	Physical
B	Chemical
C	Either Physical or Chemical
D	Reversible

Q9	Which of the following is NOT a chemical change?
A	Sublimation
B	Fermentation
C	Rusting of Iron
D	Respiration

Q10	Which among the following is an example of chemical change?
A	Melting
B	Dissolving Sugar and Water
C	Combustion
D	Sublimation

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