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a
HF
b
HCl
c
H2SO4
d
HNO3
answer is A.
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Detailed Solution
Silica is acidic , it can react with bases like NaOH and Na2CO3 to form Na2SiO3. It cannot react with acids but it reacts with HF due to the formation a complex.SiO2+HF →SiF4 →2HF H2SiF6