The p-Block Elements

Which one of the following anions is present in the chain structure silicates ?

• Si₂O₇^6-

• (Si₂O₅^6-)_n

• (SiO₃^2-)_n

• (SiO₃^2-)_n

For the following:
(i) I^-  (ii) Cl^-   (iii) Br^-

the increasing order of nucleophilicity would be: 

• I^- < Br^- < Cl^-

• Cl^- < Br^- < I^-

• I^- < Cl^- < Br^-

• I^- < Cl^- < Br^-

Which one of the following orders correctly represents the increasing acid strengths of the given acids? 

• HOCl < HOClO < HOClO₂ < HOClO₃

• HOClO < HOCl < HOClO₃ < HOClO₂

• HOClO₂ < HOClO₃ < HOClO < HOCl

• HOClO₂ < HOClO₃ < HOClO < HOCl

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH₃ (1.5 D) is larger than that of NF₃ (0.2 D). This is because:

• In NH₃ as well as in NF₃ the atomic dipole and bond dipole are in the same direction

• In NH₃ the atomic dipole  and bond dipole are in opposite directions

• In  NH₃ as well as NF₃ the atomic dipole and bond dipole are in opposite directions

• In  NH₃ as well as NF₃ the atomic dipole and bond dipole are in opposite directions

Which of the following is the most basic oxide?

• Al₂O₃

• Sb₂O₃

• Bi₂O₃

• Bi₂O₃

Which of the following species has a linear shape?

• NO₂-

• SO₂

• NO₂⁺

• NO₂⁺

Which one of the following orders is not in accordance with the property stated against it? 

• F₂ > Cl₂ > Br₂ > I₂ : Oxidising power

• HI> HBr> HCl >HF: Acidic property in water

• F₂ > Cl₂ > Br₂ > I₂: Electrongeativity

• F₂ > Cl₂ > Br₂ > I₂: Electrongeativity

The species, having bond angles of 120° is

• PH₃
  
  

• CIF₃

• NCl₃

• NCl₃

In which pair of ions both the species contain S – S bond?

• S₂O₇^2–, S₂O₃^2–

• S₄O₆^2–, S₂O₃^2–

• S₂O₇^2–, S₂O₈^2–

• S₂O₇^2–, S₂O₈^2–

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

• Na

• K

• Rb

• Rb