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Question

A soft silver-white metal (A) burns with a golden-yellow flame to give a yellow powder (B) which on treatment with water liberates oxygen giving a clear solution (C). The solution, when mixed with Al, attacks the metal, liberating a gas (D) and forming a water-soluble compound (E). The metal (A) dissolves in liquid NH3 to form a deep blue solution which is a good conductor and an excellent reducing agent. Identify E:

A
NaOH
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B
NaAlO2
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C
Ca(AlO2)2
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D
None of these
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Solution

The correct option is B NaAlO2
The intense yellow flame points to sodium metal (A). It burns in air to give a yellow powder.
Purely owing to the colour, (B) is Na2O2 and not Na2O which is white.

2Na2O2+2H2O4NaOH+O2

Al is attacked by NaOH and thus the gas (D) is H2:

2Al+2NaOH+2H2O2NaAlO2+3H2

The question only asks you to identify (E), which is NaAlO2

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