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–

582.

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

Which of the following oxide is most acidic?

• As₂O₃

• P₂O₅

• Sb₂O₃

• Bi₂O₃

when CO₂ is bubbled through a solution of barium peroxide in water then

• Carbonic acid is formed

• O₂ is released

• H₂O₂

• No reaction occurs

Among the following compounds, which will produce POCl₃ with PCl₅

• Only O₂

• O₂ and CO₂

• CO₂, O₂ and P₄O₁₀

• SO₂, H₂O, H₂SO₄ and P₄O₁₀

In which of the following compounds, sulphur show maximum oxidation number?

• H₂SO₄

• SO₃

• H₂S₂O₇

• All have same oxidation number for sulphur

Consider the reaction, H₂ + X₂ $\to$ 2HX, where X is halogen. The reactivity of halogens decrease in the order of

• Cl₂ > F₂ > Br₂ > I₂

• I₂ > Br₂ > F₂ > Cl₂

• F₂ > Cl₂ > Br₂ > I₂

• I₂ > Br₂ > Cl₂ > F₂