Question

1.when sodium hydride is electrolyzed,hydrogen gas is liberated at which electrode?

2.among the elements B, Al, C and Si:
a) which has the highest first ionization enthalpy?
b) which has the most negative electron gain enthalpy?

class 11
chemistry question please help me guys my exam also coming. ​

Answer 1

Answer:

1, Answer - Hydrogen gas is liberated at the anode as sodium hydride exists as sodium cation and hydride anion. Therefore hydrogen gas is liberated at anode by lose of electrons at anode(oxidation).

Answer 2

$\huge\star{\underline{\mathtt{\red{A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}}}}</p><p>$

Explanation:

1. When sodium hydride is electrolyzed; hydrogen gas is liberated at anode NaH ↔ Na+ + H- At anode H- -1 e-→ H H + H = H2 ↑

2. a) Carbon has the highest first ionization enthalpy among the elements B, AI, C and Si.

b) Carbon

Hope that helps you dear♡