Manipal MET2021PhysicsCurrent Electricity
When 1 g hydrogen ( E C E=1.044 10⁻⁸ ~kg C ⁻¹ ) forms water, 34 kcal heat is liberated. The minimum voltage required to decompose water is :
Options
- A0.75 V
- B3 V
- C1.5 V
- D4.5 V
Correct answer
C. 1.5 V
Step-by-step solution
q= m z = 1 10⁻³ 1.044 10⁻⁸ = 10^5 1.044 C Given, H =34 k - cal =34 10^3 4.2 ~J Heat produced, H=V q aligned & 34 10^3 4.2= V 10^5 1.044 & V= 34 10^3 4.2 1.044 10^5 =1.5 ~V aligned