31.

Which one of the following has a different crystal lattice from those of the rest?

• Ag

• V

• Cu

• Pt

The hardest lanthanide element is

• Sm

• La

• Gd

• Dy

Which one of the following binary liquid mixture exhibit positive deviation from Raoult's law?

• Carbon disulphide-acetone

• Chloroform-acetone

• Bromobenzene-chlorobenzene

• Benzene-toluene

The standard electrode potentials of Zn and Ni respectively are - 0.76 V and - 0.25 V. Then the standard emf of the spontaneous cell by coupling these under standard conditions is

• +1.01 V

• -0.51 V

• +0.51 V

• +0.25 V

How many moles of platinum will be deposited on the cathode when 0.60 F of electricity is passed through a 1.0 M solution of Pt⁴⁺?

• 0.60 mol

• 0.15 mol

• 0.30 mol

• 0.45 mol

The half-life period of a first order reaction having rate constant k = 0.231 × 10^-10 s^-1  will be

• 32 × 10¹⁰ s

• 2 × 10¹⁰ s

• 3 × 10¹⁰ s

• 2 × 10^-10 s

For the reaction X → Y, the concentrations of 'X' are 1.2 M, 0.6 M, 0.3 Mand 0.15 M at 0, 1, 2 and 3 hours respectively. The order of the reaction is

• zero

• half

• one

• two

List I contains the type of colloid while List II contains the examples.

Choose the correct match.

• A - s; B - r; C - p; D - q

• A - s; B - p; C - q; D - r

• A - r; B - s; C - q; D - p

• A - r; B - p; C - s; D - q

Glycerol can be separated from spent-lye in soap industry by

• crystallisation

• sublimation

• differential extraction

• chromatography

Which one of the following is an allylic halide?

• 2-chlorobutane

• Chloroethene

• 3-bromopropene

• 2-chlorotoluene