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)

The spin only magnetic moment of Mn⁴⁺ ion is nearly

• 3BM

• 6BM

• 4BM

• 5BM

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

Time required for 100 per cent completion of a zero order reaction is

• 2k/a

• a/2k

• a/k

• ak

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

39.

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