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

Which one of the following elements is unable to form $M{F}_6^{-3}$ ion?

• Ga

• Al

• In

• B

Which of the following statements is not true for halogens?

• All form monobasic oxyacids

• All are oxidizing agents

• Chlorine has the highest electron-gain enthalpy

• All but fluorine show positive oxidation states

In the structure of ClF₃, the number of lone pair of electrons on central atom ‘Cl’ is

• One

• Two

• Three

• Four