Identify X, Y and Z in the given reaction sequence.
$A l + N a O H \to X Y (g) - - \to Z$

X = N a [A l {(O H)}_{4}]; Y = C O_{2}; Z = A l_{2} O_{3} . x H_{2} O

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$X = N a [A l {(O H)}_{4}]; Y = S O_{2}; Z = A l_{2} O_{3} . x H_{2} O$

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X = A l {(O H)}_{3}; Y = C O_{2}; Z = A l_{2} O_{3}

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X = A l {(O H)}_{3}; Y = S O_{2}; Z = A l_{2} O_{3}

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Solution

The correct option is A $X = N a [A l {(O H)}_{4}]; Y = C O_{2}; Z = A l_{2} O_{3} . x H_{2} O$
Answer: (a)
It is process of concentration of ore by leaching method.
$A l + N a O H \to N a [A l {(O H)}_{4}] C O_{2} - - \to N a H C O_{3} + A l {(O H)}_{3} + H_{2} O$

$2 A l (O H)_{3}$ can be written as $A l_{2} O_{3} . 3 H_{2} O$
Thus, $X = N a [A l {(O H)}_{4}]; Y = C O_{2}; Z = A l_{2} O_{3} . x H_{2} O$

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