The strength of halogen acids, HF, HCl, HBr, and HI varies in the order

1. HF>HCl>HBr>HI

2. HF>HBr>HI>HCl

3. HBr>HI>HCl>HF

4. HI>HBr>HCl>HF

Why does fluorine not produce oxyacids?

1. It is most electronegative

2. It is the most powerful oxidising agent

3. It has vacant d- orbitals

4. None of the above

Which of the following does not form stable pentoxide

1. As

2. Sb

3. Bi

4. P

F₂ reacts with dilute NaOH to give oxygen difluroide. The formula is

(1) F₂O

(2) OF₂

(3) F₂O₂

(4) F₂O₃

Which of the following oxyacids of chlorine is least tendency to get oxidise?

(1) HOCl

(2) HClO₂

(3) HClO₃

(4) HClO₄

Which of the following is most basic

(1) F^-

(2) Cl^-

(3) Br^-

(4) $I^{\mathit{-}}$

Of the hydrides, $H_{2}O, H_{2}Se, and H_{2}Te$, the one which has the smallest pK_a value is

1. H₂O

2. H₂S

3. H₂Se

4. H₂Te

The shape of $Cl{O}_3^{-}$ is

(1) Tetrahedral

(2) Triangular planer

(3) Triangular pyramid

(4) Planer

Oxygen does not form OF₆ because

1. It has a small size

2. There are no vacant d- orbitals available

3.  It has high ionization energy

4. It has a large size

The molecule having the smallest bond angle is

(1) H₂O

(2) H₂S

(3) H₂Te

(4) H₂Se