Pnicogens are the elements of group

• 15

• 13

• VIII

• Zero

Which one of the following forms vortex ring ?

• P₂O₅

• PH₃

• NH₃

• P₄O₁₀

What is the product formed when acetylene reacts with hypochlorous acid ?

• CH₃COCl

• ClCH₂CHO

• Cl₂CHCHO

• ClCH₂COOH

264.

As the number of -OH groups increases in hypophosphorus acid, phosphorus acid and phosphoric acid, the acidic strength

• increases

• decreases

• remains nearly same

• remains appropriately same

The comparatively high b.pt. of HF is due to

• high reactivity of fluorine

• small size of hydrogen atom

• formation of hydrogen bonds and consequent association

• high IE of fluorine

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