Select the equations that have an exothermic step-I - S g - S g 2-II- N a g - Cl g - NaCl s III- N g - N g -IV - Al g 2- Al g 3-Choose the correct code-A- IIB- I- IIC- III and IVD- II and III

The correct option is D II and IIII. S^ _(g)→ S^ 2 _(g) The second electron affinity is positive and hence is endothermic. II. Na^+_(g) + Cl^ _(g)→ NaCl_(s) ...

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Byju's Answer

Standard XII

Chemistry

Electron Affinity

Select the eq...

Question

Select the equations that have an exothermic step.
$I . S_{(g)}^{-} \to S_{(g)}^{2 -}$
$I I . N a_{(g)}^{+} + C l_{(g)}^{-} \to N a C l_{(s)}$
$I I I . N_{(g)} \to N_{(g)}^{-}$
$I V . A l_{(g)}^{2 +} \to A l_{(g)}^{3 +}$
Choose the correct code:

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I, II

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III and IV

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II and III

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Solution

The correct option is D II and III
$I . S_{(g)}^{-} \to S_{(g)}^{- 2}$
The second electron affinity is positive and hence is endothermic.
$I I . N a_{(g)}^{+} + C l_{(g)}^{-} \to N a C l_{(s)} + e n e r g y$
Since the process released energy, it is exothermic in nature
$I I I . N_{(g)} M o r e s t a b l e \to N^{-} + e n e r g y (g) L e s s s t a b l e$
Since energy is released in this process, so it is exothermic in nature.
$I V . A l_{(g)}^{2 +} \to A l_{(g)}^{3 +}$
This is an ionisation of $A l_{(g)}^{2 +}$ to $A l_{(g)}^{3 +}$ and is endothermic in nature

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Similar questions

Q. Select equations having exothermic step.
(I)

S_{(g)}^{-} \to S_{(g)}^{2 -}

(II)

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

(III)

N_{(g)} \to N_{(g)}^{-}

(IV)

A l_{(g)}^{2 +} \to A l_{(g)}^{3 +}

Choose the correct code(s).

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I . S_{(g)}^{-} \to S_{(g)}^{2 -}

I I . N a_{(g)}^{+} + C l_{(g)}^{-} \to N a C l_{(s)}

I I I . N_{(g)} \to N_{(g)}^{-}

I V . A l_{(g)}^{2 +} \to A l_{(g)}^{3 +}

Choose the correct code:

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Q. Which of the following reaction(s) is/are exothermic for the formation of

N a F (s)

?
I.

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

II.

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III.

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The correct order of dipole moment will be:

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Select the equations that have an exothermic step. I. S−(g)→S2−(g) II. Na+(g)+Cl−(g)→NaCl(s) III. N(g)→N−(g) IV. Al2+(g)→Al3+(g) Choose the correct code:

Select the equations that have an exothermic step.
$I . S_{(g)}^{-} \to S_{(g)}^{2 -}$
$I I . N a_{(g)}^{+} + C l_{(g)}^{-} \to N a C l_{(s)}$
$I I I . N_{(g)} \to N_{(g)}^{-}$
$I V . A l_{(g)}^{2 +} \to A l_{(g)}^{3 +}$
Choose the correct code: