Which has/have a positive value(s) of Δ H ?

Question

Which has/have a positive value(s) of Δ H ? (A) H 2( g ) arrow 2 H ( g ) (B) H ( g ) arrow H +( g )+ e (C) H 2 O ( l ) arrow H 2 O ( g ) (D) H +(a q)+ OH -(a q) arrow H 2 O

Tardigrade Admin · Accepted Answer

Correct answer is (a) H 2( g ) arrow 2 H ( g )Correct answer is (b) H ( g ) arrow H +( g )+ eCorrect answer is (c) H 2 O ( l ) arrow H 2 O ( g )

Q. Which has/have a positive value(s) of $Δ H$ ?

$H_{2} (g) \to 2 H (g)$

$H (g) \to H^{+} (g) + e$

$H_{2} O (l) \to H_{2} O (g)$

$H^{+} (a q) + O H^{-} (a q) \to H_{2} O$

Correct answer is (a) $H_{2} (g) \to 2 H (g)$ Correct answer is (b) $H (g) \to H^{+} (g) + e$ Correct answer is (c) $H_{2} O (l) \to H_{2} O (g)$

Q. Which has/have a positive value(s) of ΔH ?

H2​(g)→2H(g)

H(g)→H+(g)+e

H2​O(l)→H2​O(g)

H+(aq)+OH−(aq)→H2​O