11.

The reduction potential of hydrogen half-cell will be negative if 

• p(H₂) = 1 atm and [H⁺] = 2.0 M

• p(H₂) = 1 atm and [H⁺] = 1.0 M

• p(H₂) = 2 atm and [H⁺] = 1.0 M

• p(H₂) = 2 atm and [H⁺] = 1.0 M

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

• Al₂O₃ < MgO < Na₂O < K₂O

• MgO < K₂O < Al₂O₃ < Na₂O

• Na₂O < K₂O < MgO < Al₂O₃

• Na₂O < K₂O < MgO < Al₂O₃

Which of the following statements regarding sulphur is incorrect?

• S₂ molecule is paramagnetic. 

• The vapour at 200ºC consists mostly of S₈ rings.

• At 600ºC the gas mainly consists of S₂ molecules. 

• At 600ºC the gas mainly consists of S₂ molecules. 

Which of the following facts about the complex [Cr(NH₃)₆]Cl₃ is wrong?

• The complex involves d²sp³ hybridisation and is octahedral in shape.

• The complex is paramagnetic. 

• The complex is an outer orbital complex. 

• The complex is an outer orbital complex. 

The structure of IF₇ is

• square pyramid

• trigonal bipyramid

• octahedral

• octahedral

The rate of a chemical reaction doubles for every 10ºC rise of temperature. If the temperature is raised by 50ºC, the rate of the reaction increases by about

• 10 times

• 24 times

• 32 times

• 32 times

A vessel at 1000 K contains CO₂ with a pressure of 0.5 atm. Some of the CO₂ is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is

• 1.8 atm

• 3 atm

• 0.3 atm

• 0.3 atm

In the context of the lanthanoids, which of the following statement is not correct?

• There is a gradual decrease in the radii of the members with increasing atomic number in the series. 

• All the member exhibit +3 oxidation state.

• Because of similar properties, the separation of lanthanoids is not easy.

• Because of similar properties, the separation of lanthanoids is not easy.

The magnetic moment (spin only) of [NiCl₄]^2- is:

• 1.82 BM

• 5.46 BM 

• 2.82 BM

• 2.82 BM

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is:

• A₂B 

• AB₂

• A₂B₃

• A₂B₃