Tag: chemical bonding and structure

Questions Related to chemical bonding and structure

Which of the following species contain coordinate covalent bond :

chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

  1. $AlCl _3$

  2. $CO$

  3. $[Fe(CN) _6]^{4-}$

  4. $N _3^-$

Show answer
Correct Option: B,C,D
Explanation:
$:C\equiv O:$ $\rightarrow $ In Carbonyl two covalent bonds are present and one coordinate bond is present from O$\rightarrow $C.
in $[Fe(N{ ) } _{ 6 }{ ] }^{ 4- }\rightarrow $ All bonds are coordinate bond between ${ CN }^{ - }$ and ${ Fe }^{ +2 }$ metal ion.
in ${ N } _{ 3 }^{ - }$$\rightarrow [\overset { \cdot \cdot  }{ \underset { \cdot \cdot  }{ N }  } =N=\overset { \cdot \cdot  }{ \underset { \cdot \cdot  }{ N }  } { ] }^{ - }\longleftrightarrow [\ddot { N } \equiv N-\overset { \cdot \cdot  }{ \underset { \cdot \cdot  }{ N }  } :{ ] }^{ - }$
In ${ N } _{ 3 }^{ - }$ covalent and coordinate both type of bonds are present.
in $Al{ Cl } _{ 3 }$$\rightarrow $ Icovalent bond is present only between $Al $ and $Cl$.

Coordinate bond is denoted and named respectively as:

chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

  1. arrow, dative bond

  2. dots, dative bond

  3. arrow, covalency

  4. dots, hydrogen bond

Show answer
Correct Option: A
Explanation:

Coordinate covalent bond is a special type of covalent bond in which only one of the bonded atoms contributes the electron pair for sharing.

The coordinate covalent bond is denoted by an arrow and the arrow point towards the acceptor. The other name for it is the dative bond. 

For example, the coordinate covalent bond in $\displaystyle \displaystyle ammonia : boron : trifluoride$ is denoted by an arrow as $\displaystyle \displaystyle H _3N \rightarrow BF _3$.

Hence, the correct option is A.

The covalency of oxygen in hydronium ion is equal to number of:

chemistry chemical bond and chemical equation coordinate bond types of bonds and properties chemical bonding and structure

  1. covalent bonds

  2. coordinate bonds

  3. covalent bonds and coordinate bonds

  4. valence electrons

Show answer
Correct Option: C
Explanation:

No. of covalent bonds and coordinate bonds.

In hydronium ion there are $2$ covalent bonds and $1$ coordinate bonds. 

Which of the following molecules contains covalent and coordinate bonds?

chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

  1. $CCl _4$

  2. $H _2SO _4$

  3. $NaCl$

  4. $Mg(OH) _2$

Show answer
Correct Option: B
Explanation:

Coordinate bond is formed between electron rich and electron deficient atoms. The donor atom should have at least one lone pair of electrons and the acceptor atom should have at least one vacant orbital.

In $NH _4^+$, the nitrogen in $NH _3$ is electron rich and $H^+$ ion do not contain any electron. Thus nitrogen from $NH _3$ share pair of electrons with $H^+$ to make a coordinate bonds.
Other bonds in $NH _3$ are covalent bonds.
$NH _3 + H^+ \rightarrow NH _4^+$

Which of the following will form a coordinate covalent bond with a hydronium ion?

chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

  1. $\displaystyle Na{ C } _{ 2 }{ H } _{ 3 }{ O } _{ 2 }$

  2. $\displaystyle { HC } _{ 2 }{ H } _{ 3 }{ O } _{ 2 }$

  3. $\displaystyle KCl$

  4. $\displaystyle { NH } _{ 3 }$

  5. $\displaystyle HCl$

Show answer
Correct Option: D
Explanation:

$NH _3$ forms coordinate  bond with the Hydronium ion.

Which one of the following contains just one sigma bond?

chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

  1. $\displaystyle { H } _{ 2 }$

  2. $\displaystyle { CO } _{ 2 }$

  3. $\displaystyle { H } _{ 2 }O$

  4. $\displaystyle NaCl$

  5. $\displaystyle { CH } _{ 2 }{ CH } _{ 2 }$

Show answer
Correct Option: A
Explanation:


As the valence shell of $H$ atom has single electron and it forms single sigma bond with itself.


Hence the correct option is A.

Which of the following compounds contain(s) both ionic and covalent bonds?

chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

  1. $NH _{4}Cl$

  2. $KCN$

  3. $CuSO _{4}\cdot 5H _{2}O$

  4. $NaOH$

Show answer
Correct Option: A,B,C,D

Consider following compounds:


$I: K _4[Fe(CN) _6], II:NH _4Cl, III: H _2SO _4$ 

Ionic, covalent and coordinate bonds are present in :

chemistry chemical bond and chemical equation coordinate bond types of bonds and properties chemical bonding and structure

  1. I, II and III

  2. I and III

  3. II and III

  4. I and II

Show answer
Correct Option: A
Explanation:

$H _{2}SO _{4}$  has $3$ types of bonds- ionic, covalent and coordinate. Sulphur is the central atom,surrounded by $4$ oxygen atoms and $2$ hydrogen atoms places on left of any $2$ oxygen atoms. Now, oxygen shares one electron each with the sulphur and hydrogen atom. But by this only $2$ oxygen atoms will be able to complete octet. The remaining $2$ will complete by coordinate bonding. Both the oxygen atoms will take electrons from sulphur but sulphur won't take theirs ie sharing from only one end. This is called coordinate bond. Hydronium ions are attached with sulphate ions using ionic bonding
${ K } _{ 4 }[{ Fe(CN) } _{ 6 }]\ $: has ionic bond between ${ K }^{ + }and  { [{ Fe(CN) } _{ 6 }] }^{ 4- }$, coordinate bonding in $CN$ and covalent bond in ${ [{ Fe(CN) } _{ 6 }] }^{ 4- }$
$\ { NH } _{ 4 }Cl\ $: has ionic bond between $\ { { NH } _{ 4 } }^{ + }and  { Cl }^{ -}$, coordinate bonding in $\ { { NH } _{ 4 } }^{ + }$ and covalent bond in $\ { { NH } _{ 3 } .}^{  }\quad \$

Which of the following contains a coordinate covalent bond ?

chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

  1. $N _2H^{+} _{5}$

  2. $BaCl _2$

  3. $HCl$

  4. $H _2O$

Show answer
Correct Option: A
Explanation:

${ N } _{ 2 }{ H } _{ 5 }^{ + }$ is formed from ${ N } _{ 2 }{ H } _{ 4 }$ which has a lone pair of electrons on $'N'$ and positive charge on $'H'$ takes away its electron and to complete duplet, a co-ordinate bond is present from $N$ to $H$.

$H _4N _2 + H^+ \rightarrow[H _4N _2\to H]^+$

Which of the following molecule has dative bond?

chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

  1. CO

  2. $CO _3^{2-}$

  3. $SO _4^{-2}$

  4. All of these

Show answer
Correct Option: A