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
Which one of the following pairs of substances on reaction will not evolve H2 gas?
Copper and HCl (aqueous)
Iron and steam
Iron and H2SO4 (aqueous)
Sodium and ethyl alcohol
Haematite is the ore of_______.
Copper
Iron
Aluminum
Zinc oxide
Why two ice cube are united to form one cube after pressed over each other?
ionic interaction
van der Waals force
Hydrogen bond formation
Covalent force
What is the ratio of aqua-regia?
3HCl: 1HNO3
2HCl
2HCl: 3HNO3
3HCl: 2HNO3
Which of the following is used for making bulletproof glasses?
Styrene-butadiene
Melamine
Lexan
Polypropence
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