07. The p-BLOCK ELEMENTS (XII)
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07. The p-BLOCK ELEMENTS (XII)

189315 Fluorine does not form positive oxidation states because

1 It is most electronegative element
2 It forms only anions in ionic compounds
3 It cannot form multiple bonding
4 It shows non-bonded electron pair repulsion due to small size
07. The p-BLOCK ELEMENTS (XII)

188811 Compare the  \('x'\)  and  \('y'\) bond lengths$\begin{array}{*{20}{c}}
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {H - O - S\mathop {{\text{ }} - }\limits^x {\mkern 1mu} S - O - H} 
\end{array}$$\begin{array}{*{20}{c}}
  {\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,O\,\,\,\,\,} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,||} 
\end{array}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {HO - S\mathop - \limits^y S - OH} \\ 
  {\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

1 \(x > y\)
2 \(x < y\)
3 \(x = y\)
4 Can't predict
07. The p-BLOCK ELEMENTS (XII)

189327 Ammonia on reaction with hypochlorite anion, can form

1 \(NO\)
2 \(N{H_4}Cl\)
3 \({N_2}{H_4}\)
4 Both (b) and (c)
07. The p-BLOCK ELEMENTS (XII)

189329 Which of the following elements forms a strongly acidic oxide

1 \(P\)
2 \(As\)
3 \(Sb\)
4 \(Bi\)
07. The p-BLOCK ELEMENTS (XII)

189330 In group \(V-A\) of the periodic table nitrogen forms only a trihalide but other elements form pentahalides also. The reason is

1 Nitrogen has less affinity towards halogens
2 Nitrogen halides are covalent
3 Nitrogen undergoes \({d^2}s{p^3}\) hybridization
4 Nitrogen does not have \(d\) - orbitals
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07. The p-BLOCK ELEMENTS (XII)

189315 Fluorine does not form positive oxidation states because

1 It is most electronegative element
2 It forms only anions in ionic compounds
3 It cannot form multiple bonding
4 It shows non-bonded electron pair repulsion due to small size
07. The p-BLOCK ELEMENTS (XII)

188811 Compare the  \('x'\)  and  \('y'\) bond lengths$\begin{array}{*{20}{c}}
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {H - O - S\mathop {{\text{ }} - }\limits^x {\mkern 1mu} S - O - H} 
\end{array}$$\begin{array}{*{20}{c}}
  {\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,O\,\,\,\,\,} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,||} 
\end{array}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {HO - S\mathop - \limits^y S - OH} \\ 
  {\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

1 \(x > y\)
2 \(x < y\)
3 \(x = y\)
4 Can't predict
07. The p-BLOCK ELEMENTS (XII)

189327 Ammonia on reaction with hypochlorite anion, can form

1 \(NO\)
2 \(N{H_4}Cl\)
3 \({N_2}{H_4}\)
4 Both (b) and (c)
07. The p-BLOCK ELEMENTS (XII)

189329 Which of the following elements forms a strongly acidic oxide

1 \(P\)
2 \(As\)
3 \(Sb\)
4 \(Bi\)
07. The p-BLOCK ELEMENTS (XII)

189330 In group \(V-A\) of the periodic table nitrogen forms only a trihalide but other elements form pentahalides also. The reason is

1 Nitrogen has less affinity towards halogens
2 Nitrogen halides are covalent
3 Nitrogen undergoes \({d^2}s{p^3}\) hybridization
4 Nitrogen does not have \(d\) - orbitals
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07. The p-BLOCK ELEMENTS (XII)

189315 Fluorine does not form positive oxidation states because

1 It is most electronegative element
2 It forms only anions in ionic compounds
3 It cannot form multiple bonding
4 It shows non-bonded electron pair repulsion due to small size
07. The p-BLOCK ELEMENTS (XII)

188811 Compare the  \('x'\)  and  \('y'\) bond lengths$\begin{array}{*{20}{c}}
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {H - O - S\mathop {{\text{ }} - }\limits^x {\mkern 1mu} S - O - H} 
\end{array}$$\begin{array}{*{20}{c}}
  {\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,O\,\,\,\,\,} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,||} 
\end{array}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {HO - S\mathop - \limits^y S - OH} \\ 
  {\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

1 \(x > y\)
2 \(x < y\)
3 \(x = y\)
4 Can't predict
07. The p-BLOCK ELEMENTS (XII)

189327 Ammonia on reaction with hypochlorite anion, can form

1 \(NO\)
2 \(N{H_4}Cl\)
3 \({N_2}{H_4}\)
4 Both (b) and (c)
07. The p-BLOCK ELEMENTS (XII)

189329 Which of the following elements forms a strongly acidic oxide

1 \(P\)
2 \(As\)
3 \(Sb\)
4 \(Bi\)
07. The p-BLOCK ELEMENTS (XII)

189330 In group \(V-A\) of the periodic table nitrogen forms only a trihalide but other elements form pentahalides also. The reason is

1 Nitrogen has less affinity towards halogens
2 Nitrogen halides are covalent
3 Nitrogen undergoes \({d^2}s{p^3}\) hybridization
4 Nitrogen does not have \(d\) - orbitals
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07. The p-BLOCK ELEMENTS (XII)

189315 Fluorine does not form positive oxidation states because

1 It is most electronegative element
2 It forms only anions in ionic compounds
3 It cannot form multiple bonding
4 It shows non-bonded electron pair repulsion due to small size
07. The p-BLOCK ELEMENTS (XII)

188811 Compare the  \('x'\)  and  \('y'\) bond lengths$\begin{array}{*{20}{c}}
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {H - O - S\mathop {{\text{ }} - }\limits^x {\mkern 1mu} S - O - H} 
\end{array}$$\begin{array}{*{20}{c}}
  {\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,O\,\,\,\,\,} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,||} 
\end{array}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {HO - S\mathop - \limits^y S - OH} \\ 
  {\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

1 \(x > y\)
2 \(x < y\)
3 \(x = y\)
4 Can't predict
07. The p-BLOCK ELEMENTS (XII)

189327 Ammonia on reaction with hypochlorite anion, can form

1 \(NO\)
2 \(N{H_4}Cl\)
3 \({N_2}{H_4}\)
4 Both (b) and (c)
07. The p-BLOCK ELEMENTS (XII)

189329 Which of the following elements forms a strongly acidic oxide

1 \(P\)
2 \(As\)
3 \(Sb\)
4 \(Bi\)
07. The p-BLOCK ELEMENTS (XII)

189330 In group \(V-A\) of the periodic table nitrogen forms only a trihalide but other elements form pentahalides also. The reason is

1 Nitrogen has less affinity towards halogens
2 Nitrogen halides are covalent
3 Nitrogen undergoes \({d^2}s{p^3}\) hybridization
4 Nitrogen does not have \(d\) - orbitals
NEET DIGITAL LIBRARY
07. The p-BLOCK ELEMENTS (XII)

189315 Fluorine does not form positive oxidation states because

1 It is most electronegative element
2 It forms only anions in ionic compounds
3 It cannot form multiple bonding
4 It shows non-bonded electron pair repulsion due to small size
07. The p-BLOCK ELEMENTS (XII)

188811 Compare the  \('x'\)  and  \('y'\) bond lengths$\begin{array}{*{20}{c}}
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {H - O - S\mathop {{\text{ }} - }\limits^x {\mkern 1mu} S - O - H} 
\end{array}$$\begin{array}{*{20}{c}}
  {\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,O\,\,\,\,\,} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,||} 
\end{array}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {HO - S\mathop - \limits^y S - OH} \\ 
  {\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

1 \(x > y\)
2 \(x < y\)
3 \(x = y\)
4 Can't predict
07. The p-BLOCK ELEMENTS (XII)

189327 Ammonia on reaction with hypochlorite anion, can form

1 \(NO\)
2 \(N{H_4}Cl\)
3 \({N_2}{H_4}\)
4 Both (b) and (c)
07. The p-BLOCK ELEMENTS (XII)

189329 Which of the following elements forms a strongly acidic oxide

1 \(P\)
2 \(As\)
3 \(Sb\)
4 \(Bi\)
07. The p-BLOCK ELEMENTS (XII)

189330 In group \(V-A\) of the periodic table nitrogen forms only a trihalide but other elements form pentahalides also. The reason is

1 Nitrogen has less affinity towards halogens
2 Nitrogen halides are covalent
3 Nitrogen undergoes \({d^2}s{p^3}\) hybridization
4 Nitrogen does not have \(d\) - orbitals