21.

An example of a sigma bonded organometallic compound is :

• Ruthenocene

• Grignard's reagent

• Ferrocene

• Ferrocene

Which of the following is dependent on temperature?

• Molality

• Molarity

• Mole fraction

• Mole fraction

In the electrochemical cell :
Zn|ZnSO₄(0.01M)||CuSO₄(1.0 M)|Cu, the emf of this Daniel cell is E₁. When the concentration of ZnSO₄ is changed to 1.0 M and that of CuSO₄ changed to 0.01 M, the emf changes to E₂. From the following, which one is the relationship between E₁ and E₂?
(Given, RT/F= 0.059)

• E₁= E₂

• E₁< E₂

• E₁> E₂

• E₁> E₂

In which pair of ions both the species contain S – S bond?

• S₂O₇^2–, S₂O₃^2–

• S₄O₆^2–, S₂O₃^2–

• S₂O₇^2–, S₂O₈^2–

• S₂O₇^2–, S₂O₈^2–

The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with the complexes: CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃ respectively is

• 1 AgCl, 3 AgCl, 2 AgCl

• 3 AgCl, 1 AgCl, 2 AgCl

• 3 AgCl, 2 AgCl, 1 AgCl

• 3 AgCl, 2 AgCl, 1 AgCl

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is

• [Co(en)_3]³⁺, [Co(NH₃)₆]³⁺, [Co(H₂O)₆]³⁺

• [Co(H₂O)₆]³⁺, [Co(en)₃]³⁺, [Co(NH₃)₆]³⁺

• [Co(H₂O)₆]³⁺, [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺

• [Co(H₂O)₆]³⁺, [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺

A first-order reaction has a specific reaction rate of 10^–2 s^–1. How much time will it take for 20 g of the reactant to reduce to 5 g?

• 238.6 second

• 138.6 second

• 346.5 second

• 346.5 second

Name the gas that can readily decolourises acidified KMnO₄ solution

• CO₂

• SO₂

• NO₂

• NO₂

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

• Na

• K

• Rb

• Rb

The equilibrium constants of the following are.



The equilibrium constant (K) of the reaction: