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A metal (A) on heating in nitrogen gas...

A metal (A) on heating in nitrogen gas given compound B.B on treatment with `H_(2)O` givens a colourless gas which when passed throught `CuSO_(4)` solution given a dark blue - violet coloured solution . A and B respectivley are :

A

`Na and Na_3N`

B

`Na and NaNO_3`

C

`Mg and Mg_3N_2`

D

`Mg and Mg(NO_3)_2`

Text Solution

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The correct Answer is:
To solve the problem step by step, we need to analyze the information given in the question and identify the metal (A) and the compound (B). ### Step 1: Identify the metal (A) The question states that a metal (A) reacts with nitrogen gas to form a compound (B). A common metal that reacts with nitrogen to form a nitride is magnesium. **Conclusion for Step 1:** - Metal A is magnesium (Mg). ### Step 2: Determine the compound (B) When magnesium (A) is heated in nitrogen gas, it forms magnesium nitride (Mg3N2). **Conclusion for Step 2:** - Compound B is magnesium nitride (Mg3N2). ### Step 3: Reaction of compound (B) with water Next, we need to consider what happens when magnesium nitride (B) is treated with water. The reaction of magnesium nitride with water produces magnesium hydroxide and ammonia gas (NH3): \[ \text{Mg}_3\text{N}_2 + 6\text{H}_2\text{O} \rightarrow 3\text{Mg(OH)}_2 + 2\text{NH}_3 \] Here, ammonia (NH3) is a colorless gas. **Conclusion for Step 3:** - The colorless gas produced is ammonia (NH3). ### Step 4: Reaction of ammonia with copper sulfate The final part of the question states that the colorless gas (NH3) when passed through a copper sulfate (CuSO4) solution gives a dark blue-violet colored solution. This occurs because ammonia forms a complex with copper ions: \[ \text{Cu}^{2+} + 4\text{NH}_3 \rightarrow \text{Cu(NH}_3\text{)}_4^{2+} \] This complex is known to be dark blue in color. **Conclusion for Step 4:** - The dark blue-violet solution is due to the formation of the complex \(\text{Cu(NH}_3\text{)}_4^{2+}\). ### Final Answer Thus, the metal (A) and compound (B) are: - A = Magnesium (Mg) - B = Magnesium nitride (Mg3N2) ### Summary - Metal A: Magnesium (Mg) - Compound B: Magnesium nitride (Mg3N2) ---
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