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NTA Abhyas JEE Main2020ChemistryThermodynamics (C)Practice

Which chemical change among the following involves absorption of heat?

Options

  1. AC a O + H 2 O → C a O H 2
  2. BN a g → N a + g + e -
  3. CH 2 S O 4 c o n c . + H 2 O e x c e s s → H 2 S O 4 a q
  4. DA l 3 + + 6 H 2 O → A l H 2 O 6 3 +

Correct answer

B. N a g → N a + g + e -

Step-by-step solution

N a → N a + in gaseous state requires energy which is known as ionisation enthalpy.

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