A) A and R both are correct and R is the correct explanation of A.
B) A and R both are correct but R is not the correct explanation of A.
C) A and R both are incorrect.
D) A is correct while R is incorrect.
Correct Answer: B
Solution :
Silica is soluble in HF. \[Si{{O}_{2}}\]reacts with HF to give\[Si{{F}_{4}}\]if HF is present in excess it gives\[{{H}_{2}}Si{{F}_{6}}\]. \[Si{{O}_{2}}+4HF\xrightarrow[{}]{{}}Si{{F}_{2}}+2{{H}_{2}}O\] \[Si{{F}_{4}}+2HF\xrightarrow[{}]{{}}{{H}_{2}}Si{{F}_{6}}\] hydrofluoro silicic acid So, assertion and reason both are correct but reason is not the correct explanation of assertion.
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