A. Red
B. Yellow
C. Violet
D. Black
Related Mcqs:
- The most stable allotropic form of phosphorous is the _________________ phosphorous?
A. White
B. Black
C. Yellow
D. Red - Yellow phosphorus is transported under____________________?
A. Air
B. Water
C. Nitrogen
D. Helium - Dechlorination of treated water is necessary to __________________?
A. Remove residual turbidity
B. Reduce the bacterial load on filter
C. Control taste and odour
D. Remove chlorinous taste - White phosphorous is stored under water, because __________________?
A. It does not react with water
B. It is poisonous
C. Its kindling temperature in dry air is very low
D. It is unstable - Commercial production of calcium carbide requires limestone and __________________ as raw materials?
A. Coke
B. Sand
C. Soda ash
D. Fuel oil - Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of __________________?
A. 4 kgf/cm2 & 500°C
B. 10 kgf/cm2 & 1000°C
C. 40 kg/cm2 & 200°C
D. 100 kgf/cm2 & 500°C - Brackish water which contains mostly dissolved salt, can be purified by the __________________ process?
A. Reverse osmosis
B. Sand filter
C. Lime soda
D. Permutit - Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is __________________?
A. A slow reaction
B. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
C. Still in development stage (by employing fluidised bed technique)
D. All A , B. and C - Plaster of Paris is __________________?
A. CaSO4.½H2O
B. Used for setting of broken bones
C. Both A. and B.
D. Same as gypsum - Sudden temperature fluctuation does not affect pyrex glass, because of its __________________?
A. Low co-efficient of expansion
B. High co-efficient of expansion
C. High melting point
D. Both B. and (C)
