alleryScheele made chlorine in 1774 by heating HCl with
- Manganese dioxide
- Sodium chloride
- Potassium nitrate
- Copper oxide
Show answer and solution
Correct answer: A. Manganese dioxide
Manganese dioxide oxidises hydrochloric acid, releasing chlorine gas.
NEET UG p-Block Elements — practice questions — page 3
Explore 73 free p-Block Elements questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 61–73 of 73.
Scheele made chlorine in 1774 by heating HCl withRead the answer and worked solution →Courtois discovered iodine while processingRead the answer and worked solution →With traces of water, fluorine attacks glass to formRead the answer and worked solution →Which halogen reacts explosively with hydrogen even when dark and cold?Read the answer and worked solution →Chlorine reacts explosively with hydrogen only in the presence ofRead the answer and worked solution →When iron reacts with iodine, the product isRead the answer and worked solution →In interhalogens XYn, the value of n can beRead the answer and worked solution →Interhalogens are more reactive than most halogens because their bonds areRead the answer and worked solution →Fluorine reacts vigorously with water to give HF andRead the answer and worked solution →Chlorine dissolved in water forms hydrochloric acid andRead the answer and worked solution →Iodine dissolves in aqueous KI because it forms theRead the answer and worked solution →Halogen lamps use a filament made ofRead the answer and worked solution →Which atom has the highest electron affinity?Read the answer and worked solution →
Worked practice questions
Courtois discovered iodine while processing
- Seaweed ash
- Rock salt
- Fluorspar
- Bauxite
Show answer and solution
Correct answer: A. Seaweed ash
Courtois added sulfuric acid to seaweed ash and saw purple fumes of iodine.
With traces of water, fluorine attacks glass to form
- Silicon dioxide
- Silicon tetrafluoride
- Sodium fluoride
- Silicon carbide
Show answer and solution
Correct answer: B. Silicon tetrafluoride
Fluorine reacts with the silica in glass to give silicon tetrafluoride, SiF4.
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