Consider the following list of reagents: Acidified $K_{2} C r_{2} O_{7}$ , alkaline $K M n O_{4}$ , $C u S O_{4}$ , $H_{2} O_{2}$ , $C l_{2}$ , $O_{3}$ , $F e C l_{3}$ and $N a_{2} S_{2} O_{3}$ . The total number of reagents that can oxidise aqueous iodide to iodine is:

7

No worries! We‘ve got your back. Try BYJU‘S free classes today!

6

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

5

No worries! We‘ve got your back. Try BYJU‘S free classes today!

4

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B $6$
$K_{2} C r_{2} O_{7} + 7 H_{2} S O_{4} + 6 K I \to 4 K_{2} S O_{4} + C r (S O_{4})_{3} + 3 I_{2} + 7 H_{2} O$

$2 C u S O_{4} + 4 K I \to C u_{2} I_{2} + I_{2} + 2 K_{2} S O_{4}$

$H_{2} O_{2} + 2 K I \to I_{2} + 2 K O H$

$C l_{2} + 2 K I \to 2 K C l + I_{2}$

$O_{3} + 2 K I + H_{2} O \to 2 K O H + I_{2} + O_{2}$

$2 F e C l_{3} + 2 K I \to 2 F e C l_{2} + I_{2} + 2 K C l$

$2 K M n O_{4} + K I + H_{2} O \to K I O_{3} + 2 M n O_{2} + 2 K O H$
$N a_{2} S_{2} O_{3}$ reacts with $I_{2}$ to form iodide.
There are 6 such reactions in which oxidise aqueous iodide is converted into iodine and KMnO $_{4}$ cannot.

Hence, the correct option is $B.$

Suggest Corrections

Similar questions

K_{2} C r_{2} O_{7}

K M n O_{4}, C u S O_{4}, H_{2} O_{2}, C l_{2}, O_{3}, F e C l_{3}, H N O_{3}

N a_{2} S_{2} O_{3}

Acidified K_{2} C r_{2} O_{7}, Alkanline K M n O_{4}, C u S O_{4}, H_{2} O_{2}, C l_{2}, O_{3}, F e C l_{3}, H N O_{3}, a n d N a_{2} S_{2} O_{3}

Acidified K_{2} C r_{2} O_{7}, Alkanline K M n O_{4}, C u S O_{4}, H_{2} O_{2}, C l_{2}, O_{3}, F e C l_{3}, H N O_{3}, a n d N a_{2} S_{2} O_{3}

K_{2} {C r}_{2} O_{7}

K M n O_{4}, C u {S O}_{4}, H_{2} O_{2}, {C l}_{2}, O_{2}, F e {C l}_{2}, H {N O}_{3}

{N a}_{2} S_{2} O_{3}

C u^{2 +}, c o n c . H_{2} S O_{4}, C l_{2}, (H N O_{2} + C H_{3} C O O H), A g N O_{3}

Join BYJU'S Learning Program