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
A student by chance mixed acetone with alcohol. The mixture of acetone and alcohol can be separated by
sublimation
separating funnel
crystallization
fractional distillation
Silver ware turns black after a period of time due to the formation of
Nitrate coating on silver
Sulphide coating on silver
Chloride coating on silver
Oxide coating on silver
The permanent hardness of water is caused due to dissolved
Bicarbonates of Calcium and Magnesium
Carbonates of Calcium and Magnesium
Sulphates and Nitrates of Calcium and Magnesium
Phosphates of Calcium and Magnesium
Permanent hardness of water is due to the presence of the Chlorides, Nitrates and Sulphates of calcium and magnesium, which can not be removed by boiling.
It can be removed by processes like zeolite process and lime-soda process.
It is also known as non-alkaline hardness.
Temporary hardness is caused by bicarbonates of Calcium and Magnesium.
Temporary Hardness can be removed by boiling water
Which one of the following statements about diamond and graphite is not correct?
Diamond has a tetrahedral structure, whereas graphite has a hexagonal planar structure
Both physical and chemical properties of diamond and graphite are different
Graphite is soft but diamond is hard
Graphite is a good conductor of electricity while diamond is not
