Chemistry Exam - Question
Q151. An analytical technique in which the temperature difference between the sample and a non-reactive reference material is monitored is
(a) TGA
(b) DTG
(c) DSC
(d) DTA
Answer: (d) DTA
Q152. A thermoflask used to carry hot drinks is an example of an/a
(a) Open system
(b) Closed system
(c) Isolated system
(d) Adiabatic system
Answer: (c) Isolated system
Q153. A dislocation with Burgers vector that equals one lattice spacing is called ________ dislocation
(a) Unit
(b) Partial
(c) Imperfect
(d) Frank
Answer: (a) Unit
Q154. Which of the following diatomic molecules is paramagnetic
(a) B2
(b) C2
(c) N2
(d) F2
Answer: (a) B2
Q155. The molecules P4 and CH4 exhibit the same
(a) Color
(b) Geometry
(c) Boiling point
(d) Physical state at 300 K
Answer: (b) Geometry
Q156. The most abundant transition metal ion in sea water and earth’s crust is
(a) Molybdenum
(b) Copper
(c) Iron
(d) Zinc
Answer: (c) Iron
Q157. Symbol of element was introduced by
(a) John Dalton
(b) August Kekulé
(c) Antoine Lavoisier
(d) Jöns Jacob Berzelius
Answer: (d) Jöns Jacob Berzelius