The process of setting cement under water is essentially
A.an oxidation process
B.a reduction process
C.a double decomposition process
D.a hydration process
A.an oxidation process
B.a reduction process
C.a double decomposition process
D.a hydration process
A.H2
B.O2
C.He
D.Ar
A.caustic soda
B.washing soda
C.baking powder
D.baking soda
A.reducing behaviour
B.oxidising behaviour
C.complex forming behaviour
D.reaction with light
A.60 – 70 ?C
B.130 – 140 ?C
C.200 – 215 ?C
D.100 – 110 ?C
A.low temperature and low pressure
B.low temperature and high pressure
C.high temperature and high pressure
D.high temperature and low pressure
A.solids density 1.91 and bulk density 1.0
B.solids density 1.86 and bulk density 0.6
C.solids density 1.80 and bulk desity 0.58
D.none of the above
A.400?C
B.275?C
C.550?C
D.1000?C
A.V2O5
B.AI2O3
C.Pt
D.Ni
A.time
B.current
C.resistance
D.chemical equivalent of the ion