balk3598 Asked: December 2022 a person becomes unconscious by burning coal is closed room a oxygen b carbon monoxide c hydrogen d nitrogen
balk3598 Asked: December 2022 which metal does not occur in its pure statea goldb silverc zincd copper
balk3598 Asked: December 2022 which zone of flame does a gold smith used for melting gold and silveranone luminous bluminous zonecdark zonednone of above