The correct statement regarding defects in the crystalline solid is 

• Schottky defects have no effect on the density of crystalline solid

• Frenkel defect decreases the density of crystalline solids

• Frenkel defect is a dislocation defect

• Frenkel defect is a dislocation defect

The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence

• Ga<In< Al<Tl

• Al<Ga<In<Tl

• Tl<In<Ga<Al

• Tl<In<Ga<Al

The sum of coordination number and oxidation number of the metal M in the complex [M(en)₂(C₂O₄)]Cl (where en is ethylenediamine) is 

• 9

• 6

• 7

• 7

In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with 

• Iron (II) sulphide

• Carbon monoxide

• Copper (I) sulphide

• Copper (I) sulphide

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO₄ for complete oxidation?

• FeSO₄

• FeSO₃

• FeC₂O₄

• FeC₂O₄

26.

The rate of constant of the reaction A → B is  0.6 x 10^-3 mole per second. If the concentration of A is 5 M then concentration of B after 20 min is 

• 1.08 M

• 3.60 M

• 0.36 M

• 0.36 M

The variation of the boiling point of the hydrogen halides in the order HF >  HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride?

• The electronegativity of fluorine is much higher than for other elements in the group

• There is strong hydrogen bonding between HF molecules

• The bond energy of HF molecules is greater than in other hydrogens halides

• The bond energy of HF molecules is greater than in other hydrogens halides

The name of complex ion, [Fe(CN)₆]^3- is 

• hexacyanoiron (III) ion

• hexacyanitoferrate (III) ion

• tricyanoferrate (III) ion

• tricyanoferrate (III) ion

The vacant space in bcc lattice cell is 

• 26%

• 48%

• 23%

• 23%

Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be 
(en =ethylenediamine)

• 2

• 1

• 3

• 3