Chemistry Basic Unit 6 Test

The correct order of decreasing first ionization potential (I.E) is

• Ca > K > Rb

• Ca > Rb > K

• Rb > K > Ca

• K > Rb > Ca

Let IP stand for ionization potential. Then element for which the value of IP₁, IP₂, IP₃, IP₄ are 50_eV, 100_eV, 250_eV and 2051_eV respectively is

• Al

• Mg

• Be

• C

Which of the following equations involves the largest I.E?

The bond which require the largest amount of energy to dissociate the bond connected

• H– H bond in H₂

• C – H in CH₄

• N ≡ N bond in N₂

• O = O bond in O₂

NaF has highest melting point among all sodium halides because

• It has maximum ionic character

• It has minimum ionic character

• It has associated molecule

• It has least molecular weight

The compound which contains both ionic and covalent bond

• CH₄

• H₂

• KCN

• KCl

Which shows non directional bonding

• BCl₃

• CsCl

• BeCl₂

• PCl₅

Which if the following molecule has largest number of shared pair electrons?

• NH₃

• CO₂

• C₂H₄

• N₂

Which pair will form the most stable ionic bond

• F and Cl

• Li and Br

• Mg and Na

• Na and F

In which of the following compounds, the bond has the largest percentage of ionic character

• H₂O

• HF

• HBr

• HCl