Chemical Reaction And Equation

 

።  EXOTHERMIC REACTIONS: Those reactions in which heat is evolved, they are known as Exothermic Reactions. For example,

Burning of natural gas (CNG) and respiration are exothermic reactions.

CH⁴ +20² → CO² +2H²0 +heat [Combustion of Natural gas]

C⁶H¹²O⁶+ 602 → 6CO²+ 6H²0 + heat [Respiration]

CaO + H²O ---→Ca(OH)2 (slaked lime)

[Reaction of Quick lime with water]

LET US SEE WHAT WE HAVE LEARNT :

1. Quick lime and slaked lime are

(a) Ca(OH)2 and Cao (b) CaO and CaCO3 (c) CaO and Ca(OH)2

Answer 1 Ca(OH)2 and Cao.


2.Put a sign on the reaction, which is not an exothermic, of the following

(a) Respiration reaction (b) Dipping a piece of iron in water (c) Burning of candle.

Answer 2 Dipping a piece of iron in water.

3.Which one of the following is not an example of a combination reaction ?

(a) 2H²0 +O² ---→ 2H²O

(b)AgNO³ + NaCl → AgCl + NaNO³

(c) 2Mg + O² →  2MgO

Answer 3 AgNO³ + NaCl → AgCl + NaNO³.



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