In an amino acid, the carboxyl group ionises at p = 2.34 and ammonium, ion at p = 9.6. The isoelectric point of the amino acid is at pH
5.97
11.94
2.34
9.60
In the reaction
K2Cr2O7 K2CrO4 + O2 + (X), (X) is
CrO3
C2O7
Cr2O3
CrO4
C.
Cr2O3
Potassium dichromate or K2Cr2O7 on heating gives oxygen and chromic oxide or Cr2O3.
4K2Cr2O7 4K2CrO4 + 3O22 ↑ + 2Cr2O3 (X)
What are the species (A) and (B) in the following
CrO3 + H2O → (A) (B)
H2CrO4, H2Cr2O7
H2Cr2O7, Cr2O3
CrO, Cr2O
H2CrO4, CrO
In the reaction,
2FeCl3 + H2S → 2FeCl2 + 2HCl + S
The correct statement is
FeCl3 acts as an oxidising agent
H2S and FeCl3 both act as an oxidising agent
FeCl3 get oxidised while H2S get reduced
H2S acts as an oxidising agent
Transition elements exhibit variable valencies, because they release electrons from the following orbits
ns
ns and np
(n - 1) d and ns
nd and (n - 1)d
Potassium fluoride has NaCl type structure. What is the distance between K+ and F- ions, if edge length of unit cell is 'a'.
2a
4a
The flame colours of metal ions are due to
Schottky defect
Frenkel defect
Metal excess defect
Metal deficient defect
On passing 3A of electricity for 50 min, 1.8 g metal is deposited, the equivalent mass of metal is
9.3
19.3
38.3
39.9