Chemistry MCQS for Class 10
In smelting process a small amount of coke is required because:
it is very slow process
it is highly endothermic process
it is very fast process
it is highly exothermic process
Ammonia is prepared by the process .
Clark
Haber
All
Ostwald
The residual oil is heated above 400 c to produce.
Asphalt
Paraffin wax
Lubricants
All
When CO2 is passed through the ammonical brine the only salt that precipitates is:
(NH4)2CO3
NH4HCO3
Na2CO3
NaHCO3
Concentration is process of:
Separating technique
Boiling technique
Mixting technique
Cooling techique
The raw materials for the manufacturing of urea are.
a & b
Ammonia
Limestone
Carbondioxide
Which one of the following is not faction of crude oil.
Petroleum coke
Paraffin wax
Fuel oil
Asphalt
Blonde hair contains compound of.
Copper
titanium
Molybdenum
Iron
Froth flotation process is used to concentrate.
Aluminum ore
Chromium ore
Iron ore
Copper ore
How many % age of nitrogen in urea fertilizers?
46.6
45.6
40.6
50
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