Q2 of 805 Page 180

Sodium carbonate is a basic salt because it is a salt of

Sodium carbonate is formed by the reaction between Carbonic acid and sodium hydroxide. Sodium hydroxide is a strong base while carbonic acid is a weak acid.


H2CO3 (Carbonic Acid)+2NaOH (Sodium Hydroxide) → Na2CO3 (Sodium Carbonate)+H2O (water)

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How do fossil fuels cause air pollution?

OR


Explain the role of the Sun in the formation of soil.

 1

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Which among the following is (are) true about slaking of lime?

(i) It is an endothermic reaction


(ii) It is an exothermic reaction


(iii) The pH of the resulting solution will be more than seven


(iv) The pH of the resulting solution will be less than seven

 3

Which one of the following four metals would be displaced from the solution of its salt by other three metals?

 4

Which one among the following is the correct representation of electron dot structure of nitrogen