The number of electrons that are involved in the reduction of permanganate to manganese (II) salt, manganate and manganese dioxide respectively are
5, 1, 3
5, 3, 1
2, 7, 1
5, 2, 3
The calculated magnetic moment of a divalent ion of an atom with atomic number 24 in aqueus solution is
4.90 BM
5.92 BM
3.87 BM
2.84 BM
The entropy of vaporisation of a liquid is 58 JK-1 mol-1. If 100 g of its vapour condenses at its boiling point of 123° C, the value of entropy change for the process is
-100 JK-1
100 JK-1
-123 JK-1
123 JK-1
The values of limiting ionic conductance of H+ and HCOO- ions are respectively 347 and 53S cm2 mol-1, the dissociation constant of methanoic acid at 298 K is
2.5 × 10-4
2 × 10-5
2.5 × 10-5
1.5 × 10-4
A.
2.5 × 10-4
Given, = 347 S cm2 mol-1
= 53 S cm2 mol-1
= 347 + 53 = 400 S cm2 mol-1
Degree of dissociation,
<<<1 so 1 - α ≈ 1
Ka = C α2
= 0.025 × (0.1)2
= 2.5 × 10-4
In a closed cylinder of capacity 24.6 L, the following reaction occurs at 27°C.
A2 (s) B2 (s) + 2C (g)
At equilibrium, 1 gm of B2 (s) (molar mass = 50 g mol-1) is present. The equilibrium constant Kp for the equilibrium in atm2 unit is
(R = 0.082 L atm K-1 mol-1)
1.6 × 10-2
1.6 × 10-5
1.6 × 10-3
1.6 × 10-4
The pH of a saturated solution of a metal hydroxide of formula X(OH)2 is 12.0 at 298 K. What is the solubility product of a metal hydroxide at 298 K (in mol3 L-3)?
5 × 10-7
2 × 10-6
1 × 10-7
5 × 10-5
The IUPAC name of the complex [Co(NH3)2(H2O)4]Cl3 is
diaminetetraaquacobalt (III) trichlodde
diaminetetraaquacobalt (II) chloride
diaminetetraaquacobalt (III) chloride
tetraaquadiaminecobalt (III) trichloride
The products obtained by the ozonolysis of 2-ethylbut-1-ene are
propanone and ethanal
methanal and 3-pentanone
ethanal and 3-pentanone
butanal and ethanal
When but-2-yne is treated with Na in liquid ammonia
cis-2-butene is obtained
trans-2-butene is formed
n-butane is the major product
it rearranges to but-1-yne