Reactivity order of halides for dehydrohalogenation is

• R - F > R - Cl > R - Br > R - I

• R - I > R - Br > R - Cl > R - F

• R - I > R - Cl > R - Br > R - F

• R - F > R - I > R - Br > R - Cl

The correct order of ionization energy for comparing carbon, nitrogen and oxygen atoms is :

• C > N > O

• C > N < O

• C < N > O

• C < N < O

Which one of the following is expected to have largest size ?

• F^-

• O^2-

• Al³⁺

• N^3-

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

297.

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