p-Block Elements

JEE Chemistry · 225 questions · Page 23 of 23 · Click an option or "Show Solution" to reveal answer

Q221

The reaction of NO with N2O4 at 250 K gives :

A N2O3

B N2O5

C N2O

D NO2

Correct Answer

Option A

Solution

2NO + N2O4

\overset{{250K}}\longrightarrow

2N2O3

Q222

Which one of the following correctly represents the order of stability of oxides, X2O; (X = halogen)?

A Br > Cl > I

B Br > I > Cl

C Cl > I > Br

D I > Cl > Br

Correct Answer

Option D

Solution

Stability of oxides of Halogens is I > Cl > Br

Q223

The oxide without nitrogen-nitrogen bond is :

A N2O

B N2O4

C N2O3

D N2O5

Correct Answer

Option D

Solution

(a) N $\equiv$ N+ $-$ O $-$ (b) (c) (d)

Q224

The number of P

-

O bonds in P4O6 is :

A 6

B 9

C 12

D 18

Correct Answer

Option C

Solution

\therefore\,\,\,

Number of P $-$ O Bonds = 12

Q225

The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two P-H bonds, is :

A Phosphonic acid

B Phosphinic acid

C Pyrophosphorus acid

D Hypophosphoric acid

Correct Answer

Option B

Solution

P4 + 3NaOH + 3H2O $\to$ PH3 + 3NaH2PO2 oxoacid = H3PO2 (hypo phosphorus acid) or (phosphinic acid)

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