Questions

Antarctica is known as white continent because 98% of it's area is covered by ice throughout the year.

W is the symbol for chemical element Tungsten or Wolfram.

It is used in making filaments of bulbs.

River Congo is the only river which crosses the equator twice.

 Capital of Kazakhsthan is Astana

Magnetic tape can serve as a Secondary storage unit. It is a medium for magnetic recording, made of a thin, magnetizable coating on a long, narrow strip of plastic film.

Tetraethyl lead is a highly toxic compound used as a gasoline additive.

Tetraethyl lead abbreviated as TEL, is an organo lead compound with the formula (CH₃CH₂)₄Pb. It is a petro-fuel additive which in turn caused increased vehicle performance. This is also used as an antiknock agent in gasoline and jet fuels. Tetraethyl lead is absorbed rapidly by the skin, the lungs, and the gastrointestinal tract. It is converted to triethyl lead, which might be responsible for its toxicity.