Pyrex glass is resistant to sudden temperature variations because it has
A.low coefficient of expansion
B.high softening temperature
C.low density and high melting point
D.high coefficient of expansion
A.low coefficient of expansion
B.high softening temperature
C.low density and high melting point
D.high coefficient of expansion
A.sodium carbonate
B.sodium hydroxide
C.sodium bicarbonate
D.sodium oxide
A.NiO
B.CaO
C.FeSO4
D.CdS
A.thermal cracking of naphtha
B.passing steam and air through red hot coke
C.passing air through red hot coke
D.passing steam through red hot coke
A.?-particles
B.?-particles
C.? -praticles
D.mesons
A.H2
B.He
C.N2
D.Ar
A.welding
B.cutting of metals
C.medicinal purposes
D.all of the above
A.ethanol
B.ethabol amines
C.water
D.98.5% H2SO4
A.a crystalline solid
B.a super cooled liquid
C.a solid having a definite melting point
D.a compound of Ca Na Si and O
A.magnesium carbonate
B.sodium carbonate
C.calcium carbonate
D.potassium carbonate