2.  If both Assertion and Reason are true but Reason is not, the correct explanation of Assertion.

3.   If Assertion is true but Reason is false.

4.  If both Assertion and Reason are false

1.  natural silk

3.  natural plastic or rubber

4.  synthetic plastic

1.  0.0014

2.  7.2862

4.  8.2706

1.  Chain

2.  position

3.  geometrical

1.  adsorption produces heat which increases the speed of the reaction

3.  the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption

4.  in the process of adsorption, the activation energy of the molecules become large

2.  PbO2

3.  Pb3O4

4.  Pb(CH3COO)2

2.  blue

3.  yellow

4.  orange

2.  I2O5

3.  I2O7

4.  I2O9

1.  NH4OH

2.  NaOH

4.  C2H5OH

1.  hot alkaline KMnO4

2.  neutral FeCl3

4.  none of the above