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1
The element/compounds involved in the chemical reaction are called _________________ .
Reactants
Products
Substance
None of these .
2
What are the examples of physical change ?
Formation of dew
Bending of glass tube
Crushing of iron
All of these.
3
What are the characteristics of physical change ?
No new substance is formed.
The change is reversible.
The change is temporary.
4
In a chemical equation names of the ____________________ are written on the left hand side .
5
_______________ is a characteristics of chemical reaction .
Evolution of gas
Change in pressure
Change in volume
6
When a new substance is formed after the change, it is called __________________change.
Physical
Chemical
Both (a) and (b) are correct.
None of these.
7
Which of the following are correct ?
(a) A Chemical Equations is the shorthand form of representing a chemical reaction using symbols and formula.
(b) The element/compounds involved in the reaction are called products and the new elements/compounds formed are called the reactants.
Only (a) is correct .
Only (b) is correct .
Both (a) and (b) is correct.
8
Which of the following are chemical change ?
Reddish – Brown Decomposition on Iron Objects
Browning of Vegetables and Fruit Surface
Reaction Between Vinegar and Baking Soda
9
When a new substance is formed after the change, it is called _______________ .
Physical change
Chemical change
Reversible change
None of these ,
10
In Which of the following reaction(s) is/are the reactant(s) in a gaseous state and the product(s) in a liquid state?
11
Which of the following is necessary for rusting of iron ?
Water
Air
Heat energy
Both A and B
12
Which of the following is a balanced chemical equation of the reaction between carbon monoxide gas and hydrogen gas?
13
14
15
In which of the following reactions is the energy required to break old bonds more than the energy released during the formation of new bonds?