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Question

SiO2 can react with:

A
NaOH only
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B
HF only
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C
Neither HF nor NaOH
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D
Both HF and NaOH
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Solution

The correct option is D Both HF and NaOH
Silicon dioxide reacts with sodium hydroxide to producte sodium silicate and water. This reaction takes place at temperature of 9001000C
2NaOH+SiO2Na2SiO3+H2O
Silicon dioxide reacts with hydrofluoric acid to produce hexafluro silicic acid & water.
SiO2+6HFH2SiF6+2H2O
SiO2 definitely reacts with strong bases like NaOH
SiO2 is a very stable and unreactive toward various acids and chlorides, however it react with HF to give H2SiF6.

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