Which of the following is a sink for CO?

• Haemoglobin

• Micro-organisms present in the soil
  
  

• Oceans

• Oceans

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

• Sublimation

• Chromatography

• Crystallisation

• Crystallisation

Which one of the following pairs of species has the same bond order?

• CO, NO

• O₂, NO⁺

• CN^–, CO

• CN^–, CO

Which is the incorrect statement?

• FeO_0.98 has non stoichiometric metal deficiency defect

• Density decreases in case of crystals with Schottky's defect

• NaCl(s) is insulator, silicon is semiconductor,silver is conductor, quartz is piezo electric crystal

• NaCl(s) is insulator, silicon is semiconductor,silver is conductor, quartz is piezo electric crystal

Concentration of the Ag+ ions in a saturated solution of Ag₂C₂O₄ is 2.2 ×10^–4 mol L^–1. Solubility product

• 2.42 × 10^–8

• 2.66 × 10^–12

• 4.5 × 10^–11

• 4.5 × 10^–11

The species, having bond angles of 120° is

• PH₃
  
  

• CIF₃

• NCl₃

• NCl₃

17.

If molality of the dilute solution is doubled, the value of molal depression constant (K_f) will be

• Doubled

• Halved

• Tripled

• Tripled

It is because of inability of ns² electrons of the valence shell to participate in bonding that

• Sn²⁺ is reducing while Pb⁴⁺ is oxidising

• Sn²⁺ is oxidising while Pb⁴⁺ is reducing

• Sn²⁺ and Pb²⁺ are both oxidising and reducing

• Sn²⁺ and Pb²⁺ are both oxidising and reducing

Which one of the following statements is not correct?

• Catalyst does not initiate any reaction

• The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium

• Enzymes catalyse mainly bio-chemical reactions
  
  

• Enzymes catalyse mainly bio-chemical reactions
  
  

The reason for greater range of oxidation states in actinoids is attributed to

• The radioactive nature of actinoids

• Actinoid contraction

• 5f, 6d and 7s levels having comparable energies

• 5f, 6d and 7s levels having comparable energies