Q.1
Which one of the following reactions are endothermic?
  • Fe(s)→Fe(l)
  • 2C+2H2+20kcal/mol → C2H
  • Ba(OH)2+CO2 → BaCO3+H2O+heat
  • Both A & B
Q.2
In a chemical reaction, energy is used to :
  • cause a change of state
  • overcome intermolecular forces
  • break or form bonds within molecules
  • All of above
Q.3
A change in matter in which heat is absorbed is ..... process
  • Endothermic
  • Exothermic
  • Absorbed
  • Gained
0 h : 0 m : 1 s