Answer to Question #67820 in Physical Chemistry for rahina

Question

Question 6 : Powdered marble reacts more rapidly with HCl than the chips of marble because:
Surface area of powdered marble is more that of chips of marble and hence there is more collisions between the molecules of reactants
Number of molecules increases.
Energy of activation decreases
Marble chips will not react with HCl

Question 7 : In the reaction:
2
B
→
P
r
o
d
u
c
t
2B→Product
; the rate equation is: Rate = k[B]. If the concentration of ‘B’ is doubled, the rate of reaction will increase by a multiple of
Four
Three
None of these
Two

Question 8 : For a reaction:
2
H
2
+
2
N
O
→
2
H
2
O
+
N
2
2H2+2NO→2H2O+N2
the rate law is
R
=
K
[
H
2
]
[
N
O
]
2
R=K[H2][NO]2
The Order of the reaction is?
2
3
0
1

Question 9 : The rate of chemical reaction
Remains constant as reaction proceeds
Increases as the reaction proceeds
Decreases as the reaction proceeds
Both (a) and (b)