For the decomposition of a compound AB at 600 K, the following data were obtained
[AB] mol dm-3 | Rate of decomposition of AB in mol dm-3 |
0.20 | 2.75 × 10-8 |
0.40 | 11.0 × 10-8 |
0.60 | 24.75 × 10-8 |
The order for the decomposition of AB is
1.5
0
1
2
A miscible mixture of C6H6 + CHCl3 can be separated by
sublimation
distillation
filtration
crystallisation
The heat of combustion of carbon to CO2 is -393.5 kJ/ mol. The heat released upon formation of 35.2 gm of CO2 from carbon and oxygen gas is:
+315 kJ
-31.5 kJ
-315 kJ
+31.5 kJ
Which of the following substances acts as an oxidising as well as a reducing agent ?
Na2O
SnCl2
Na2O2
NaNO2
3ClO-(aq) → ClO- + 2Cl is an example of
Oxidation reaction
reduction reaction
disproportionation reaction
decomposition reaction
In the equation
CrO + SO
the oxidation number of Cr changes from
+6 to +4
+6 to +3
+8 to +4
+4 to +3
Which quantities are conserved in all oxidation- reduction reactions?
Charge only
Mass only
Both charge and mass
Neither charge nor mass
C.
Both charge and mass
Oxidation involves loss of electrons and reduction involves gain of electrons, hence in case of oxidation-reduction reactions (redox reactions) charge remains conserved. Moreover, in all chemical reactions mass also remains conserved. eg, in the reaction,