Tag: chemistry

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

The bonds present in $K _4[Fe(CN) _6]$ are:

  1. all ionic

  2. all covalent

  3. ionic and covalent

  4. ionic, covalent and coordinate covalent

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The bonds present in  $\displaystyle K _4 [Fe(CN) _6]$ are ionic, covalent and coordinate covalent bonds. Ionic bonds are present between $\displaystyle K^+$ ion and $\displaystyle [Fe(CN) _6]^{4-}$ ion.
Covalent bonds are present in $\displaystyle C \equiv N$ ligand.
Co-ordinate covalent bonds are present between $\displaystyle Fe$ and $\displaystyle C$ and also in between $\displaystyle C$ and $\displaystyle N$.

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

Which one of the following statements is true for ammonium ion?

  1. All bonds are ionic.

  2. All bonds are dative bonds.

  3. Hydrogen atoms are situated at the corners of a tetrahedron.

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In $\displaystyle ammonium $ ion $\displaystyle NH _4^+$ three $\displaystyle N-H$ bonds are covalent and one $\displaystyle N-H$ bond is coordinate covalent (dative). $Hydrogen$ atoms are situated at the corners of a tetrahedron as $\displaystyle N$ atom is $\displaystyle sp^3$ hybridised.

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

Coordinate bond is present in:

  1. Hydronium ion

  2. Water

  3. Sulphur dioxide

  4. Ammonia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation


From the given compounds only Hydronium ion forms a coordinate or dative bond, where $O$ is the donor atom and $H$ is the acceptor.

Hydronium ion can be shown as:
$\displaystyle H _2O \rightarrow H^+$  or $\displaystyle H _3O^+$.
Hence, the correct option is A. 

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

Which of the following species contain coordinate covalent bond :

  1. $AlCl _3$
  2. $CO$
  3. $[Fe(CN) _6]^{4-}$
  4. $N _3^-$
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
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 $Cl$.
Multiple choice chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

Coordinate bond is denoted and named respectively as:

  1. arrow, dative bond

  2. dots, dative bond

  3. arrow, covalency

  4. dots, hydrogen bond
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which of the following molecules contains covalent and coordinate bonds?

  1. $CCl _4$
  2. $H _2SO _4$
  3. $NaCl$
  4. $Mg(OH) _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
$NH _3 + H^+ \rightarrow NH _4^+$

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

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

  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. $\displaystyle HCl$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

Which one of the following contains just one sigma bond?

  1. $\displaystyle { H } _{ 2 }$
  2. $\displaystyle { CO } _{ 2 }$
  3. $\displaystyle { H } _{ 2 }O$
  4. $\displaystyle NaCl$
  5. $\displaystyle { CH } _{ 2 }{ CH } _{ 2 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
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.