NCERT Class 11 Chemistry Competitive Exams Questions and Answers

NCERT Class 11 Chemistry Competitive Exams Questions and Answers NCERT Class 11 Chemistry QUESTIONS

NCERT Class 11 Chemistry Competitive Exams Questions and Answers

81 What is the chemical name of Green vitriol?
A Iron sulphate
B Calcium cyanamide
C Calcium carbonate
D Calcium phosphate

Answer: Iron sulphate
82 The substance used in the manufacture of high voltage insulators is
A Artificial rubber
B Silicons
C Natural rubber
D Silicon carbide

Answer: Silicons
83 What are Rubies and Sapphires chemically known as
A aluminium oxide
B boron nitride
C silicon dioxide
D lead tetra oxide

Answer: aluminium oxide
84 Curd is sour due to presence of
A Lactic acid
B Oxalic acid
C Acidic acid
D Tartaric acid

Answer: Lactic acid
85 Which of the following is a super cooled liquid?
A Glass
B Ice cream
C Teflon
D Mercury

Answer: Glass
86 Retinol is the chemical name of
A Vitamin A
B Vitamin K
C Vitamin E
D Vitamin D

Answer: Vitamin A
87 Which one of the following is not a chemical change ?
A Crystallization of table salt from sea water
B Cracking of petroleum
C Fermentation of sugarcane juice
D Burning of coal in air

Answer: Crystallization of table salt from sea water
88 Aspirin is
A ethyl salicylate
B methyl salicylate
C sodium salicylate
D acetyl salicylic acid

Answer: methyl salicylate
89 Water drops are spherical because of
A polarity
B viscosity
C surface tension
D density is one

Answer: surface tension
90 Who discovered radioactivity?
A Henri Becquerel
B John Dalton
C Roentgen
D Marie Curie

Answer: Henri Becquerel

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