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

The oxidation state of fe in the brown ring complex : [Fe(H₂O)₅NO]SO₄ is

• +3

• 0

• +2

• +1

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

The compound having the lowest oxidation state of iron is :

• K₄Fe(CN)₆

• K₂FeO₄

• Fe₂O₃

• Fe(CO)₅

3ClO^-(aq) → ClO^- + 2Cl is an example of

• Oxidation reaction

• reduction reaction

• disproportionation reaction

• decomposition reaction

When K₂Cr₂O₇ is converted into K₂CrO₄, the change in oxidation number of chromium is :

• 0

• 5

• 7

• 9

249.

In the equation

CrO${}_4^{2-}$ + SO${}_3^{2-} \to \mathrm{Cr}(\mathrm{OH}{)}_4^{-} + {\mathrm{SO}}_4^{2-}$

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