The purest form of iron is 1 Steel 2 Cast iron 3 Pig iron 4 Wrought iron21 58401
Of the following metals which, one pollutes the air of a big city? 1 Copper 2 Chromium 3 Lead 4 Cadmium3 13005
Long distance photography is facilitated by 1 Visible light 2 X-rays 3 Infrared rays 4 Ultraviolet rays4 14975
Which synthetic fiber is known as artificial silk? 1 Cotton 2 Rayon 3 Terylene 4 Nylon4 22303
What are different constituents of food? Explain14 38177
Knowing that iron has an atomic number of 26, how many protons and how many electrons does fe+2 have?
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