Laboratory glass wares which reacts with hydrofluoric acid, are made of the ______________ glass?

A. Calcium carbonate
B. Calcium oxide
C. Tricalcium silicate
D. Calcium sulphate

A. Electrolysis
B. Electrolytic reduction
C. Electrolytic oxidation
D. None of these

A. Methyl alcohol
B. Ethyl alcohol
C. Benzol
D. Dimethyl ether

A. Na2SO4
B. CaSO4
C. MgSO4
D. BaSO4

A. Low ash content
B. Low ignition temperature
C. High electrical resistivity
D. All A , B. and C.