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The following reactions are carried out:

\(A:\) Nitrogen + metal \(\rightarrow\) compound \(X\)
\(B:\) \(X\) + water \(\rightarrow\) ammonia + another compound
\(C:\) Ammonia + metal oxide \(\rightarrow\) metal + water + \(N_2\)

One metal that can be used for reaction \(A\) is magnesium. Write the correctly balanced equation for reaction \(B\), where \(X\) is the compound formed.
(A) \({Na }{ N }_{ 2 }+{ H }_{ 2 }O\rightarrow { NH }_{ 3 }+Na_2O\)
(B) \({Mg }_{ 3 }{ N }_{ 2 }+{ 3H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+ 3MgO\)
(C) \({Ca }_{ 3 }{ N }_{ 2 }+{ H }_{ 2 }O\rightarrow { NH }_{ 3 }+CaO\)
(D) None of these
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The following reactions are carried out:

\(A:\) Nitrogen + metal \(\rightarrow\) compound \(X\)
\(B:\) \(X\) + water \(\rightarrow\) ammonia + another compound
\(C:\) Ammonia + metal oxide \(\rightarrow\) metal + water + \(N_2\)

One metal that can be used for reaction \(A\) is magnesium. Write the correctly balanced equation for reaction \(B\), where \(X\) is the compound formed.
(A) \({Na }{ N }_{ 2 }+{ H }_{ 2 }O\rightarrow { NH }_{ 3 }+Na_2O\)
(B) \({Mg }_{ 3 }{ N }_{ 2 }+{ 3H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+ 3MgO\)
(C) \({Ca }_{ 3 }{ N }_{ 2 }+{ H }_{ 2 }O\rightarrow { NH }_{ 3 }+CaO\)
(D) None of these

Answer

Answer: D
One metal that can be used for reaction A is magnesium. So the corresponding reaction A is\(N_2 + 3Mg\rightarrow Mg_3N_2\)
Hence the compound X is \(-\ Mg_3N_2\).
The complete reactions involving \(Mg\) are as follows:

A:\(N_2 + 3Mg\rightarrow Mg_3N_2\)

B:\(Mg_3N_2+6H_2O\rightarrow 3Mg(OH)_2+2NH_3\)

C: \(2NH_3+ 3MgO\rightarrow 3Mg+3H_2O+N_2\)

The correct balanced equation for reaction B is\(Mg_3N_2+6H_2O\rightarrow 3Mg(OH)_2+2NH_3\)
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