481.

Which of the following elements forms pπ- pπ bond with itself?

• P

• Se

• N

• Te

Extraction of chlorine from brine solution based on

• Oxidation

• acidification

• chlorination

• reduction

Which chlorine atom is more electronegative in the following ?

• CH₃-Cl

• CH₃-CH₂-Cl

• H-$\underset{{\mathrm{CH}}_3}{\overset{{\mathrm{CH}}_3}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}$-Cl

• CH₃-CH₂-$\underset{{\mathrm{CH}}_3}{\overset{{\mathrm{CH}}_3}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}$-Cl

Which one of the following noble gas has an unusual property of diffusing through the materials such as rubber, glass or plastic?

• Kr

• Ne

• Ar

• He

Select wrong chemical reaction among the following.

• 8NH₃ + 3Cl₂ → 6NH₄Cl + N₂

• 2Ca(OH)₂ + Cl₂ → Ca(OCl)₂ + CaCl₂ + 2H₂O

• 2NaOH + Cl₂ → 2NaCl + H₂ + O₂

• MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O

In the reaction :

X is -

• SiC

• H₂SO₄

• KMnO₄

• Fe/ HCl

NH₃ gas is dried over :

• CaO

• HNO₃

• P₂O₅

• CuSO₄

Fluorine exhibits an oxidation state of only -1 because:

• it can readily accept an electron

• it is very strongly electronegative

• it is a non-metal

• it belong to halogen family

Which among the following factors is the most important in making fluorine the strongest oxidizing agent ?

• Electron affinity

• Ionization enthalpy

• Hydration enthalpy

• Bond dissociation energy

Philosopher's wool on heating with BaO at 1100°C produce :

• Ba + ZnCl₂

• BaCdO₂

• BaZnO₂

• BaO₂ + Zn