Skip to content
MCQtimes.com
GK
Pakistan Studies
Current Affairs
Islamic Studies
English
MCQtimes.com
Toggle Menu
Chemical Industries
Home
/
Chemistry
/
Chemical Industries
Show/Hide Answers
Chemical Industries
The percentage of nitrogen in urea is about:
38.4
46.6
59.1
61.3
The percentage of nitrogen in urea (CH4N2O) is 46.6%. To calculate the percentage of nitrogen in urea, we can use the following formula: (mass of nitrogen / mass of urea) * 100% The mass of nitrogen in urea is 28 g/mol, and the mass of urea is 60 g/mol. Therefore, the percentage of nitrogen in urea is: (28 g/mol / 60 g/mol) * 100% = 46.6%
Author:
rikazzz
Comment
Chemical Industries
Third step of metallurgy is
crushing, grinding or pulverizing of the ore
concentration of the ore
extraction of metal
refining of metal
Author:
rikazzz
Comment
Chemical Industries
The fourth step of the Solvay process is
preparation of ammonical brine
carbonation
filtration
calcination
Author:
rikazzz
Comment
Chemical Industries
The first step of metallurgy is
crushing, grinding or pulverizing of the ore
concentration of the ore
extraction of metal
refining of metal
Author:
rikazzz
Comment
Chemical Industries
Ore of zinc is called
galena
zinc blende
cinnabar
chromite
Author:
rikazzz
Comment
Chemical Industries
The process of smelting involves the
reduction of metal oxides
oxidation of minerals
oxidation of metals
melting of metals
Author:
rikazzz
Comment
Chemical Industries
The boiling point of kerosene is
below 20 °C
35 °C to 70 °C
70 °C to 120 °C
170 °C to 250 °C
Author:
rikazzz
Comment
Chemical Industries
Ore of sodium is called
hematite
chalcopyrite
bauxite
halite
Author:
rikazzz
Comment
Chemical Industries
Which of the following used in paving roads and making roofing material?
diesel
lubricating oil
fuel oil
bitumen
Author:
rikazzz
Comment
Chemical Industries
Number of carbon atoms per molecule in bitumen are
14 to 20
20 to 50
50 to 70
more than 70
Author:
rikazzz
Comment
Page navigation
1
2
3
…
7
Next Page
Next
Go to Page
Light
Dark
GK
Pakistan Studies
Current Affairs
Islamic Studies
English