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301.

A vey high cosmic abundance of Fe is due toA. its ferro-magnetic natureB. its high nuclear binding energyC. its high reactivity towards `O_2`D. None of these.

Answer» Correct Answer - B
Discussion
302.

Galena is an ore ofA. PbB. HgC. SnD. Zn

Answer» Correct Answer - A
Galena is an ore of lead.
Discussion
303.

Which of the following element is extracted commercially by the electrolysis of an aqueous solution of its compound ?A. ChlorineB. BromineC. SodiumD. Aliuminium

Answer» Correct Answer - A
Electrolysis of NaCl(aq) gives `Cl_2` at anode.
Discussion
304.

The natural materials from which an element can be extracted economically are calledA. OresB. MineralsC. GangueD. None of the above

Answer» Correct Answer - A
The natural materials from which an element can be extracted economically are called ores.
Discussion
305.

The element generally extracted from sea-weed ashes isA. `Cl_2`B. NaC. `I_2`D. K

Answer» Correct Answer - C
Discussion