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Hess' Law

Which of the ...

Question

Which of the following is/are true for the bellow reaction?
$C u + 4 H N O_{3} \to C u (N O_{3})_{2} + 2 H_{2} O + 2 N O_{2} (g)$

I only

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III only

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I and II only

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II and III only

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I, II and III

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Solution

The correct option is E I, II and III
Dilute $H N O_{3}$ with $C u$ gives $N O$ while concentrated $H N O_{3}$ gives $N O_{2}$ gas.
$3 C u + 8 H N O_{3}      (d i l .) ⟶ 3 C u (N O_{3})_{2} + 2 N O ↑ + 4 H_{2} O$
$C u + 4 H N O_{3}      (c o n c .) ⟶ C u (N O_{3})_{2} + 2 N O_{2} ↑ + 2 H_{2} O$

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Question 12
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) $A u$
(ii) $C u$
(iii) $N a$
(iv) $K$

(a) (i) and (ii) (b) (i) and (iii)

Question 12
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) $A u$
(ii) $C u$
(iii) $N a$
(iv) $K$

(a) (i) and (ii) (b) (i) and (iii)

N a F (s)

N a_{(g)} \to N a_{(g)}^{+} + e^{-}

F_{(g)} + e^{-} \to F_{(g)}^{-}

N a_{(g)}^{+} + F_{(g)}^{-} \to N a F_{(s)}

C u^{+} \to C u^{2 +} + C u

3 M n O_{4}^{-} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O

2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}

2 M n O_{4}^{-} + 3 M n^{2 +} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}

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