11. The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of
A. atomic structure
B. metallurgy
C. periodic table of contents
D. discovery of elements
✅ The correct answer is option C.
Chemistry MCQs
12. The hardest form of carbon is
A. coke
B. graphite
C. diamond
D. charcoal
✅ The correct answer is option C.
13. The heat required to raise the temperature of body by 1 K is called
A. specific heat
B. thermal capacity
C. water equivalent
D. None of the above
✅ The correct answer is option B.
14. The major constituent of air is
A. nitrogen
B. carbon dioxide
C. oxygen
D. hydrogen
✅ The correct answer is option A.
15. The National Chemical Laboratory is situated in
A. New Delhi
B. Bangalore
C. Pune
D. Patna
✅ The correct answer is option C.
16. The main active constituent of tea and coffee is
A. nicotine
B. chlorophyll
C. caffeine
D. aspirin
✅ The correct answer is option C.
17. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
A. cineole
B. engenol
C. geraniol
D. limonene
✅ The correct answer is option A.
18. The nucleus of a hydrogen atom consists of
A. 1 proton only
B. 1 proton + 2 neutron
C. 1 neutron only
D. 1 electron only
✅ The correct answer is option A.
19. The molecules of which gas have highest speed?
A. H2 at -73oC
B. CH4 at 300 K
C. N2 at 1,027oC
D. O2 at 0oC
✅ The correct answer is option A.
20. The items amenable to detection by soft x-rays are
A. contrabands
B. lead in bullets
C. narcotics
D. genuine coins from counterfeit coins
✅ The correct answer is option D.