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Q.

Zinc reacts with NaOH solution to produce ________.

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a

Na2ZnO2

b

O2

c

NO2 

d

NH3

answer is B.

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Detailed Solution

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Zinc reacts with NaOH, a solution to produce Sodium zincate.
Zn + 2NaOH → Na2ZnO2  + H2(g) 
Zinc is amphoteric metal as it reacts with both acid and base. It reacts with Sodium hydroxide to form Sodium zincate (Na2ZnO2)  and hydrogen gas. This reaction occurs at a temperature near 550°C. In this process hydrogen is the only gas that is produced, so that is easily distinguishable. 
 

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