Consider following reactions-I- N 2 - O 2 - 2NO H- X 1II- 2CO- O 2 - 2 CO 2 H- X 2III- 2 H 2 O- O 2 - 2 H 2 O 2 H- X 3IV- PCI 3 - CI 2 - PCI 5 H- X 4In which case s- H f - H - 2-

The correct option is A I, II,III H _ f is calculated for one mole of product. #160;If there is one mole of product, then H _ f = H . #160;But in ...

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Bond Order and Enthalpy

Consider foll...

Question

Consider following reactions:
I: $N_{2} + O_{2} \to 2 N O △ H = X_{1}$
II: $2 C O + O_{2} \to 2 {C O}_{2} △ H = X_{2}$
III: $2 H_{2} O + O_{2} \to 2 {H_{2} O}_{2} △ H = X_{3}$
IV: $P C I_{3} + {C I}_{2} \to P C I_{5} △ H = X_{4}$
In which case (s), $△ H_{f} = \frac{△ H}{2}$ ?

I, II,III

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II, III

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Solution

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P C I_{5} \to P C I_{3} + C I_{2}

N_{2} + O_{2} \to 2 N O

2 K C I O_{3} \to 2 K C I + 3 O_{2}

F e^{3 +} + S C N_{-} \to F e (S C N)^{2 +}

2 N a + 2 H_{2} O \to 2 N a O H + H_{2}

2 N a O H + C l_{2} \to N a C l + N a O C l + H_{2} O

4 O H^{-} \to O_{2} + 2 H_{2} O + 4 e^{-}

2 C l^{-} \to C l_{2} + 2 e^{-}

N H_{3} + O_{2} \to N O + H_{2} O

N O + O_{2} \to N O_{2}

N O_{2} + H_{2} O \to H N O_{3} + H N O_{2}

N H O_{2} \to H N O_{3} + N O + H_{2} O

For which of the following process, the value of $Δ$ H negative?

I) $N_{2} + O_{2} \to 2 N O$

N_{2} + 3 H_{2} F e + M o - --- \to 2 N H_{3}

2 S O_{2} + O_{2} V_{2} O_{5} - -- \to 2 S O_{3}

H_{2} + I_{2} p t - \to 2 H I

What is the effect of the following processes on the bond order in $N_{2}$ and $O_{2}$ ?

(i). $N_{2} \to N_{2}^{+} + e^{-}$

(ii) $O_{2} \to O_{2}^{+} + e^{-}$

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