Chemistry-Objective Related Question Answers
476. The most abundant halogen present in earth's crust?
Fluorine (0.08%)
477. The disease caused by the deficiency of fluorine?
Fluorosis
478. The most abundant halide in earth's crust by weight?
Fluoride
479. The compound known as fluorspar?
Calcium Fluoride
480. The scientist who discovered and isolated the chlorine gas?
carl scheele
481. The scientist who recognized chlorine as an element?
Humphry Davy
482. The second element having highest reactivity?
Chlorine
483. The colour of Chlorine gas?
Pale yellow green
484. The organic compound which contains chlorine?
DDT; BHC; Chloroform; Freon
485. Chloroform was discovered by?
James Young Simpson
486. The poisonous substance produced when the chlorine is exposed?
Phosgene
487. The gas which was used as chemical weapon in the First World War?
Phosgene
488. The element used to purify the water in swimming pool?
Chlorine
489. The element used as an oxidising agent?
Chlorine
490. The element used as a bleaching agent?
Chlorine
491. The most abundant element present in sea water?
Chlorine
492. The remedy gas which is used against the chlorine poisoning?
Ammonia
493. The chlorine compound present in tear gas?
Benzyl Chloride
494. The compound of chlorine used in the plastics?
Polyvinyl chloride (PVC)
495. The solvent used as an anesthetic?
Chloroform
496. The compound used as an antiseptic?
Sodium Hypochlorite
497. The non metal present in liquid form in room temperature?
Bromine
498. The bromine compound used in photographic films?
Silver Bromide
499. Third lightest halogen?
Bromine
500. Commonly used halogen is?
Iodine
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