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
82 The substance used in the manufacture of high voltage insulators is
A Artificial rubber
B Silicons
C Natural rubber
D Silicon carbide
83 What are Rubies and Sapphires chemically known as
A aluminium oxide
B boron nitride
C silicon dioxide
D lead tetra oxide
84 Curd is sour due to presence of
A Lactic acid
B Oxalic acid
C Acidic acid
D Tartaric acid
85 Which of the following is a super cooled liquid?
A Glass
B Ice cream
C Teflon
D Mercury
86 Retinol is the chemical name of
A Vitamin A
B Vitamin K
C Vitamin E
D Vitamin D
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
90 Who discovered radioactivity?
A Henri Becquerel
B John Dalton
C Roentgen
D Marie Curie