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Standard XII

Chemistry

Reactivity Trends (Group 2)

When a brown ...

Question

When a brown compound of manganese (A) is treated with HCL it gives a gas (B). The gas taken in excess, reacts with $N H_{3}$ to give an explosive compound (C). Identify compounds A, B and C.

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Solution

Reaction between (A) and $H C l$ to give (B)

A brown compound of Manganese is $M n O_{2} (A)$ . The chemical reaction taking place between $M n O_{2}$ and $H C l$ is given as:

$M n O_{2} + 4 H C l \to M n C l_{2} + C l_{2} + 2 H_{2} o$
(A) (B)

Thus, when $M n O_{2}$ reacts with $H C l$ it produces chlorine gas $C l_{2}$ (B).

Reaction between (B) and $N H_{3}$

The chlorine gas when taken in excess and reacted with ammonia $N H_{3}$ produces nitrogen trichloride (C), which is an explosive compound. The reaction is shown below:

${N H}_{3} + C l_{2} (e x c e s s) \to N C l_{3} + 3 H C l$
(B) (C)

Thus, the compounds A, B and C are: $A = M n O_{2} B = C l_{2} C = N C l_{3}$

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Reactivity Trends (Group 2)

Standard XII Chemistry

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When a brown compound of manganese (A) is treated with HCL it gives a gas (B). The gas taken in excess, reacts with NH3 to give an explosive compound (C). Identify compounds A, B and C.

When a brown compound of manganese (A) is treated with HCL it gives a gas (B). The gas taken in excess, reacts with $N H_{3}$ to give an explosive compound (C). Identify compounds A, B and C.