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Question

Conditions of Hydrogen and Chlorine to combine with :


A

Heat

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B

Sunlight

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C

Catalyst

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D

Pressure

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Solution

The correct option is B

Sunlight


The explanation for the correct options

B. Sunlight

  • Hydrogen (H2) and Chlorine (Cl2) reacts in presence of sunlight to form Hydrogen chloride ( HCl ) .
  • They do not react without presence of sunlight because, some energy is required to overcome the existing bonds.
  • It is also called photochemical reactions.

H2(g)Hydrogen+Cl2(g)ChlorineSunlight2HCl(g)Hydrogenchloride(Hydrochloricacid)

The explanation for the incorrect options

A. Heat

  • Some reactions requires absorb or release heat during the process of chemical reaction.
  • If heat is absorbed during the chemical reaction then it is called Endothermic reaction.

For example, Boiling of water, photosynthesis etc

  • If heat is released during the chemical reaction then it is called Exothermic reaction.

For example, CaO(s)Calciumoxide+H2O(l)WaterCa(OH)2(aq)CalciumHydroxide+Heat

C. Catalyst

  • A catalyst is a substance that speeds up or decreases the temperature or pressure required to start a chemical reaction without being consumed in the process.
  • The addition of a catalyst to a reaction is known as catalysis.

H2O2(l)HydrogenperoxidePlatinumPtH2O(l)Water+ONascentoxygen

D. Pressure

  • By applying pressure the rate of reaction can be increased.
  • This method is also used in manufacturing of Ammonia by Born Haber's process.

N2(g)Nitrogen+H2(g)HydrogenFe240atm2NH3(g)Ammonia

Hence option (B) is correct, Sunlight is required for combination of Hydrogen and Chlorine.


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