Find out the expression among the following that can be used to designate a maximum of $3$ moles of ions.

H_{2} (g)

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C O_{2} (g)

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2 N_{2} O (g)

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2 N a C l (a q)

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H_{2} S O_{4} (d i l u t e a q)

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Solution

The correct option is E $H_{2} S O_{4} (d i l u t e a q)$
The expression among the following that can be used to designate a maximum of 3 moles of ions is $H_{2} S O_{4}$ (dilute aq).
It corresponds to one mole of sulphuric acid molecules which one complete dissociation will give three moles of ions.
$H_{2} S O_{4} \to 2 H^{+} + S O_{4}^{2 -}$
$H_{2} (g)$ , $C O_{2} (g)$ , $N_{2} O (g)$ do not dissociate. Hence, no ions will be formed.
2 moles of $N a C l (a q)$ on complete dissociation will give 4 moles of ions. $2 N a C l (a q) \to 2 N a^{+} (a q) + 2 C l^{-} (a q)$

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Which of the following is an example of double displacement reaction?
(i) $C O_{2} (g) + H_{2} (g) \to C O (g) + H_{2} O (g)$
(ii) $P_{4} O_{10} (s) + 6 H_{2} O (l) \to 4 H_{3} P O_{4} (a q)$
(iii) $H_{2} + O_{2} \to H_{2} O$
(iv) $C o C l_{2} (a q) + N a_{2} C O_{3} (a q) \to C o C O_{3} (a q) + 2 N a C l (a q)$

Q. The above laboratory setup can be used to prepare which of the following?
I.

C O_{2} (g)

II.

H_{2} (g)

III.

O_{2} (g)

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Find out the expression among the following that can be used to designate a maximum of 3 moles of ions.

Find out the expression among the following that can be used to designate a maximum of $3$ moles of ions.