Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in the air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B)?
A- O2; B- CaCo3
A- CO2; B- Ca(OH)2
A- O2; B- Ca(OH)2
A- CO2; B- CaCo3
When we heat lead nitrate [Pb(NO3)2] in a boiling tube, we observe the emission of brown fumes. Which one of the followings is the brown gas?
NO
N2O2
N2O
NO2
Which one of the followings do silver articles react with, that makes the silver articles black?
Sulfur
Oxygen
Carbon dioxide
Phosphorus
Which one of the following metals is kept immersed in Kerosene oil to protect it and to prevent accidental fire?
Calcium
Sodium
Vanadium
Magnesium
Aluminum is manufactured from
Copper ore
Bauxite ore
Mica ore
Manganese ore
