Which one ofthe following does not involve coagulation?
Formation of delta regions
Peptization
Treatment of drinking water by potash alum
Clotting of blood by the use of ferric chloride
Which one of the following statements is true?
Saponification of oil yields a diol
Drying of oil involves hydrolysis
Addition of antioxidant to oil minimizes rancidity
Refining of oil involves hydrogenation
The IUPAC name of K2[Ni(CN)4] is
potassium tetracyanonickelate (II)
potassium tetracyanatonickelate (III)
potassium tetracyanatonickel (II)
potassium tetracyanonickel (III)
In Kjeldahl's method, ammonia from 5 g of food neutralizes 30 cm3 of 0.1 N acid. The percentage of nitrogen in the food is
0.84
8.4
16.8
1.68
The activation energy for a reaction at the 37. temperature T K was found to be 2.303 RT J mo1-1. The ratio of the rate constant to Arrhenius factor is
10-1
10-2
2 × 10-3
2 × 10-2
Which one of the following is wrongly matched?
[Cu(NH3)4]2+ - Square planar
[Ni(CO)4] - Netural ligand
[Fe(CN6)3-] - sp3d2
[Co(en)3]3+ - Follows EAN
C.
[Fe(CN6)3-] - sp3d2
(a) [Cu(NH3)4]2+ , Cu is present as Cu2+= [Ar]3d94s0
[Cu(NH3)4]2+ =
(NH3, being a strong field ligand shifts one electron from 3d orbital to 4p orbital.)
(b) In [Ni(CO)4], CO is a Netural ligand.
(c) In [Fe(CN6)3-], Fe is present as Fe3+
Fe3+= [Ar]3d5 4s0
Thus, its hybridisation is d2sp3 not sp3d2 i.e, it is an inner orbital complex.
(d)[Co(en)3]3+ contains total 36 electrons, ie, Follows EAN rule.
9.65 C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus, obtained is completely converted into a Grignard reagent. The number of moles of the Grignard reagent obtained is
5 × 10-4
1 × 10-4
5 × 10-5
1 × 10-5
The standard emf of galvanic cell involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the reaction of the cell is
1025
1020
1015
1030