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 is correct order of basic strength

(A) $OC{l}^{-}>Cl{O}_2^{-}>Cl{O}_3^{-}>Cl{O}_4^{-}$

(B) $Cl{O}_4^{-}>Cl{O}_3^{-}>Cl{O}_2^{-}>Cl{O}^{-}$

(C) $Cl{O}_3^{-}>Cl{O}_4^{-}>Cl{O}_2^{-}>Cl{O}^{-}$

(D) None of these

Which of the following does not form stable pentoxide

1. As

2. Sb

3. Bi

4. P

Which is the correct order order of decreasing boiling point of azeotropic mixtures HX-H₂O

(1) HI,HBr,HF,HCl

(2) HI,HCl,HBr,HF

(3) HF,HCl,HBr,HI

(4) HCl,HF,HBr,HI

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

An element (X) forms compounds of the formula $XC{l}_3, X_2{O}_5 and C{a}_3{X}_2,$but does not form X$C{l}_5$. Which of the following is the element

(1) B

(2) Al

(3) N

(4) P

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