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
Symbol of an element was Introduced by ?
John Dalton
Antoine Lavoisier
Jones Jakob Berzelius
Robert Doyle
Identify the correct pair of elements among the following which are liquid at room temperature and standard pressure.
Bromine and fluorine
Mercury and rubidium
Bromine and thallium
Bromine and mercury
Which one of the following oxides shows both acidic and basic behavior?
Zinc oxide
Copper oxide
Magnesium oxide
Calcium
Silver articles turn black when kept in the open for a longer time due to the formation of ?
H2S
AgS
AgSO4
Ag2S
Which of the following lenses will bend the light rays through the largest angle?
Lens with power +2.0 D
Lens with power +2.5 D
Lens with power –1.5 D
Lens with power –2.0 D
