Question

Q2 - Write difference between exothermic and endothermic reactions.            (1)                                                                                    

(1) Z + CuSo4  à Cu + ZnSo4

(2) C + ZNO    à Co + Zn                                                                                                           (2)

Q3 - Balance the following chemical equations.

(1) HNo3 + Ca(OH)2 à Ca(NO3) + H2O

(2) BaCl2 + H2SO4  à BaSo4 + HCL

(3) H2 + Cl2   à HCL                                                                                                                    (3)

Q4. Write the  oxidising and reducing agent in the following equations. 

                                                                                                                                                     (2)

(1) Zn + CuS04  à Cu + Zn S04

(2) C + ZnO à Co + Zn​

Answer 1

Q1. Exothermic Reaction -

1. The energy is released from the system to its environment.
2. Energy is released as heat, electricity, light or sound.

Endothermic Reaction -

1. The energy is absorbed from the surrounding into the reaction.
2. Energy in the form of heat.

Q2 -

(I) $2HNO3+Ca(OH)2 -----> Ca(NO3)2+2H20$

(ii) BaCl2 + H2SO4 -----> BaSo4 + 2HCL