Question

Which oxide does not react with cold dilute sodium hydroxide to produce a salt?

Answer 1

Answer:SiO2

Explanation:Silicon dioxide reacts with sodium hydroxide solution, but only if it is hot and concentrated.

Answer 2

Silicon dioxide (SiO2)

Silicon dioxide (SiO2)does not react with cold dilute sodium hydroxide to produce a salt

• In baking mixes including flour, silicon dioxide is frequently employed as an anti-caking ingredient. Silicon dioxide, commonly referred to as synthetic amorphous silica (SAS), is a common thickener, anti-caking ingredient, and carrier for flavours and perfumes in food products.

• Any alkali hydroxide, including sodium hydroxide, can dissolve and react with silicon dioxide in extremely hot or concentrated concentrations, creating an aqueous solution of sodium silicate (waterglass).

• Only when the sodium hydroxide solution is heated and concentrated can silicon dioxide react with it.
• By reducing with carbon, silica is transformed into silicon. When fluorine reacts with silicon dioxide, SiF4 and O2 are produced. Hexafluorosilicic acid is made when silicon dioxide combines with hydrofluoric acid (H2SiF6).

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