What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH₁), sodium sulphide (pH₂), sodium selenide (pH3) and sodium telluride (pH₄)?

• pH₁ > pH₂ = pH₃ =pH₄

• pH₁ <pH₂ < pH₃ <pH₄

• pH₁ < pH₂ > pH₃< pH₄

• pH₁> pH₂ > pH₃ > pH₄
  
  

When fluorine reacts with hot and conc. NaOH , it gives :

• Na₂O

• Na

• H₂

• O₂

653.

End product of the hydrolysis of XeF₆ is :

• XeOF₄

• XeO₂F₂

• XeO₃

• XeOF₃

HF is not preserved in glass bottle because :

• it reacts with the visible part of the light

• it reacts with the sodium oxide of the glass

• it reacts with the aluminium oxide of the glass composition

• it reacts with SiO₂ of the glass

Which of the following is not hydrolysed ?

• AsCl₃

• PF₃

• SbCl₃

• NF₃

The number of S - S bonds in sulphur trioxide trimer (S₃O₉) is

• three

• two

• one

• zero

XeF₆ on complete hydrolysis produces

• XeOF₄

• XeO₂F₂

• XeO₃

• XeO₂

Which acid has P - P linkage?

• Hypophosphoric acid

• Pyrophosphoric acid

• Metaphosphoric acid

• Orthophosphoric acid

Which statement is wrong for NO ?

• It is anhydride of nitrous acid

• Its dipole moment is 0.22 D

• It forms dimer

• It is paramagnetic

There is no S-S bond in :

• S₂O₄^2-

• S₂O₅^2-

• S₂O₃^2-

• S₂O₇^2-