341.

The correct order of ionisation energy of C, N, O and F is

• C < N < O < F

• C < O < N < F

• F < O < N < C

• F < N < C < O

A metallic oxide reacts with water to from its hydroxide, hydrogen peroxide and also liberates oxygen. The metallic oxide could be

• CaO

• KO₂

• Li₂O

• Na₂O₂

Which one of these is not known?

• CuCl₂

• CuI₂

• CuF₂

• CuBr₂

The species that is not hydrolysed in water is

• P₄O₁₀

• BaO₂

• Mg₈N₂

• CaC₂

Pauling's electronegativity values for elements are useful in predicting :

• polarity of bonds in molecules

• position of elements in electromotive series

• co-ordination number

• dipole moment of various molecules

Identify the non-polar molecule in the set of compounds given :

HCl, HF, H₂, HBr

• H₂

• HCl

• HF, HBr

• HBr

Which of the following pairs involves isoelectronic ions ?

• Mn³⁺ and Fe²⁺

• Mn²⁺ and Fe³⁺

• Cr³⁺ and Mn²⁺

• Fe²⁺ and Co²⁺

Which one of the following has the highest electronegativity ?

• Br

• Cl

• P

• Si

The only non-metal which is liquid at ordinary temperature is :

• Hg

• Br₂

• NH₃

• None of these

Which is the correct order of electronegativity?

• F > N < O < C

• F > N > O > C

• F > N > O < C

• F < N < O = C