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Molecules and Atomicity

Which of thes...

Question

Which of these is not a molecule?

A

H_{2}

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B

C l

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C

O_{3}

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D

N a C l

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Solution

The correct option is A $C l$
$H_{2}$ is a molecule of hydrogen, $O_{3}$ is a molecule of ozone and $N a C l$ is a molecule of common salt, sodium chloride. $C l$ is an atom of chlorine, not a molecule. A molecule of chlorine is $C l_{2}$ .

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Similar questions

Q. Which of the following molecules does not possess a permanent dipole moment :
(1) H2S
(2) SO2
(3) S(O3)2-
(4) CS2

Q. Which choice or choices demonstrate amphoterism?
i.

H C l + H_{2} O \to H_{3} O^{+} + C l^{-}

H_{2} O + N_{3} \to O H^{-} + N H_{4}^{-}

H S^{-} + H C l \to C l^{-} + H_{2} S

H S^{-} + N H_{3} \to N H_{4}^{+} + S^{2 -}

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

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

Q. Classify the following as elements and compounds: MgO, H₂, NaCl, Cl₂, N₂, Cl, Ca, H₂O

Q. Consider the reaction:

{C l}_{2} (a q .) + H_{2} S (a q .) ⟶ S (s) + 2 H^{+} (a q .) + 2 {C l}^{-} (a q .)

The rate equation for this reaction is:
Rate

= k [{C l}_{2}] [H_{2} S]

Which of these mechanisms is/are consistent with this rate equation?

A

{C l}_{2} + H_{2} S ⟶ H^{+} + {C l}^{-} + {C l}^{+} + H S^{-}

{C l}^{+} + H S^{-} ⟶ H^{+} + {C l}^{-} + S

B

H_{2} S ⇌ H^{+} + H S^{-}

(fast equilibrium)

{C l}_{2} + H S^{-} ⟶ 2 {C l}^{-} + H^{+} + S

Q. Consider the reaction :

C l_{2} (a q) + H_{2} S (a q) \to S (s) + 2 H^{+} (a q) + 2 C l^{-} (a q)

The rate equation for this reaction is

= k [C l_{2}] [H_{2} S]

Which of these mechanisms

i s / a r e

consistent with this rate equation?
(A)

C l_{2} + H_{2} S \to H^{+} + C l^{-} + C l^{+} + H S^{-}

C l^{+} + H S^{-} \to H^{+} + C l^{-} + S

H_{2} S \Leftrightarrow H^{+} + H S^{-}

(fast equilibrium)

C l_{2} + H S^{-} \to 2 C l^{-} + H^{+} + S

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