851.

Which of the following property does not correspond to the order HI < HBr < HCl < HF ?

• Thermal stability

• Reducing power

• Ionic character

• Dipole moment

Which of the following phosphorus oxyacids can act as a reducing agent?

• H₃PO₃

• H₃PO₄

• H₂P₂O₆

• H₄P₂O₇

Argon possesses

• translational motion only

• translational + rotational motion

• translational + vibrational motion

• translational + rotational + vibrational motion

Which of the following compound of xenon does not exists?

• XeF₆

• XeF₄

• XeF₅

• XeF₂

Which among the following group 16 elements exists in more than two allotropic states?

• Polonium

• Tellurium

• Selenium

• Oxygen

Electronic configuration of only one p-block element is exceptional. One molecule of that element consists of how many atoms of it?

• One

• Two

• Three

• Four

Which oxyacid of sulphur contains S-S single bond?

• Oleum

• Marshall's acid

• Dithionic acid

• Thiosulphuric acid

Which among the following group 15 element forms most stable pentavalent compound?

• Phosphorus

• Antimony

• Bismuth

• Arsenic

What is the basicity of orthophosphorous acid?

• One

• Two

• Three

• Four

Which oxoacid of sulphur contains S-S bond in its structure?

• Disulphurous acid

• Disulphuric acid

• Perdisulphuric acid

• Hydrosulphurous acid