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136. Which of the following reactions is used for increasing the number of carbon atoms in a chain ?
A. Substitution reaction
B. Wurtz reaction
C. Friedel -Crafts reaction
D. Cannizzaros reaction
Explanation:
137. Copper wires are generally used for electrical power transmission instead of iron wires because
A. copper is a better conductor than iron.
B. copper is cheaper than iron.
C. copper can take higher power than iron.
D. copper is lighter than iron.
Explanation:
138. When ice melts into water, its
A. volume increases
B. mass increases
C. volume decreases
D. mass decreases
Explanation:
139. When an open bottle of scent is kept in a corner of the room, its odour is felt in all the corners. This is due to the phenomenon of
A. vaporisation
B. evaporation
C. diffusion
D. sublimation
Explanation:
140. The founder of the technique of psychoanalysis was
A. Isaac Naslov
B. John Heats
C. Pavlov
D. Sigmund Freud
Explanation:
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