Question

and a
B. Fill in the Blanks
Q.5
In a reversible reaction both reactants and
products are separated from each other by
using .......
.... sign.
(g)
Q.6
Combustion reactions are always
in nature.
0(1)
9)
.. common
Q.7
Exothermic reactions are
than endothermic reaction.
of
20(1)
Q.8
Decomposition reactions are
combination reactions.
​

Answer 1

Answer:

Endothermic reaction : the reaction in which heat and light is absorbed during a chemical reaction .

Example: decomposition of calcium carbonate is an endothermic reaction

Exothermic reaction:the reaction in which heat and light is evolved or produced during a chemical reaction .

Example :reaction between calcium oxide and water gives calcium hydroxide and heat.

Answer 2

Answer:

409.8 parts per million

this answer is for

Q)how much percentage of carbon dioxide is present in air..?