On the basis of standard electrode potential of redox couples given below, find out which of the following is the strongest oxidising agent.
(E values : Fe3+ | Fe2+ = +0.77 V; I2(s) | I- = +0.54 V; Cu2+ | Cu = +0.34 V; Ag+ | Ag = +0.80 V)
Fe3+
I2(s)
Cu2+
Ag+
The depression in freezing point of 0.1 M aqueous solutions of HCl, CuSO4 and K2SO4 are in the ratio
1 : 1 : 1.5
1 : 2 : 3
1 : 1 : 1
2 : 4 : 3
The chemical reaction, 2O3 3O2 proceeds as follows:
Step 1 : O3 O2 + O ...(fast)
Step 2 : O + O3 2O2 ...(slow)
The rate law expression should be
r = k' [O3][O2]
r = k'[O3]2[O2]-1
r = k'[O3]2
unpredictable
The coagulation of 200 mL of a positive colloid took place when 0.73 g HCl was added to it without changing the volume much. The flocculation value of HCl for the colloid is
100
36.5
0.365
150
ZnO is white when cold and yellow when heated. It is due to the development of
Frenkel defect
metal excess defect
Schottky defect
metal deficiency defect.
Which of the following pairs of substances cannot exist together in solution?
Na2CO3 + NaOH
NaHCO3 + Na2CO3
NaHCO3 + NaOH
NaOH + HCl
Among the following, the compound that is both paramagnetic and coloured is
K2Cr2O7
(NH4)2[TiCl6]
VOSO4
K3[Cu(CN)4]
Assertion : If standard reduction potential for the reaction Ag+ + e- Ag is 0.80 volt, then for the reaction 2Ag+ + 2e- 2Ag, it will be 1.60 volt.
Reason: If concentration of Ag+ ions is doubled, the standard electrode potential is also doubled.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion : Hydrides of group-16 elements show volatility in the order :
H2O > H2S > H2Se > H2Te
Reason : Electronegativity of group-16 elements increases down the group from oxygen to tellurium
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false
Assertion : Equivalent weight of NH, in the reaction, N, NH3 is 17/3 while that of N2 is 28/6.
Reason : Equivalent weight =
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
A.
If both assertion and reason are true and reason is the correct explanation of assertion.