Tag: chemical bond and chemical equation

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Questions Related to chemical bond and chemical equation

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

Assertion: The weakest of the bonds between molecules are coordinate covalent bonds.
Reason: Coordinate covalent bonds represent the weak attractive force of the electrons of one molecule for the positively charged nucleus of another.

  1. <p>Both Assertion and Reason are correct and Reason is the correct explanation of Assertion</p>

  2. <p>Both Assertion and Reason are correct and Reason is not the correct explanation of Assertion</p>

  3. <p>Assertion is correct but Reason is not correct</p>

  4. <p>Assertion is not correct but Reason is correct</p>

  5. <p>Both the Assertion and Reason are not correct</p>
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Assertion: The weakest of the forces between molecules are dispersion forces or London forces.
Reason: Dispersion forces or London forces represent the weak attractive forces that originate as a result of instantaneous dipoles induced in atoms or molecules.
Hence, both the assertion and reason are not correct.

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

Which of the following species cannot act as an electron pair donor for the formation of dative bond?

  1. H$ _3$I$^+$
  2. NH$ _4^+$
  3. OH$^-$
  4. NH$ _3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a dative bond, the shared pair of electrons come from the same atom. In $NH _{4}^{+}$ all the 4 valence electrons of N are bonded to the hydrogen atoms, thus it cannot act as an electron pair donor for the formation of dative bond.

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

What is unique about the bonds in coordination compounds?

  1. One of the atoms or ions donates both shared electrons

  2. Both of the atoms or ions donate both shared electrons

  3. The metal is bonded to ligands

  4. The bond is a covalent bond

  5. The bond is an ionic bond
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The unique thing about the bonds in coordination compounds is that one of the atoms or ions donates both shared electrons. Thus, the bond is covalent coordinate bond.

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

Dative bond is present in the molecule:

  1. ${NH} _{3}$
  2. ${CO} _{2}$
  3. $NaCl$
  4. $P{Cl} _{5}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dative bond is present in the $\displaystyle PCl _5$ molecule.
In the solid state, $\displaystyle PCl _5$ molecule exists in the form of $\displaystyle [PCl _4]^+$ $\displaystyle [PCl _6]^-$
Dative bond is present in $\displaystyle [PCl _6]^-$ ion. The chloride ion is the donor atom and P atom is acceptor atom. The dative bond is also called co ordinate covalent bond.

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

A coordinate covalent bond is represented by an ______ from donor to acceptor.

  1. single arrow

  2. line

  3. double arrow

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

A coordinate covalent bond is represented by an single arrow from donor to acceptor.
A coordinate bond is formed when one atom donates its pair of electrons to the other atom. For example, a lone pair of electrons on N atom of ammonia is donated to a proton to form ammonium ion with a coordinate bond between N and H.

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

Which of the following statements is/are true regarding $NH _4^+$?

  1. $NH _4^+$ contains a dative bond
  2. Bond angle increases when a bond is formed between $NH _3$ and $H^+$.
  3. $NH _4^+$ has pyramidal shape.
  4. The type of hybridisation changes when a bond is formed between $NH _3$ and $H^+$
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

 (A) $\displaystyle NH _4^+$ ion contains a dative bond (co-ordinate covalent bond) between $\displaystyle N$ atom and  $\displaystyle H$ atom.
$\displaystyle H _3N \rightarrow H^+$

(B) Bond angle increases when a bond is formed between $\displaystyle NH _3$ and $\displaystyle H^+$. In $\displaystyle NH _3$ molecule, due to repulsion between lone pair and bond pair of electrons, the bond angle decreases. When $\displaystyle NH _4^+$ ion is formed, lone pair is converted into bond pair. The inter electron repulsion decreases and bond angle increases.

(C) $\displaystyle NH _4^+$ ion has tetrahedral shape. $\displaystyle NH _3$ molecule has pyramidal shape.

(D) The type of hybridisation is not changed when bond is formed between $\displaystyle NH _3$ and $\displaystyle H^+$

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

The pair of compounds having coordinate covalent bonds is:

  1. $Br _{2}$ and $Hg$
  2. $Cl _{2}$ and $F _{2}$
  3. $NH _{4}^{+}$ and $H _{3}O^{+}$
  4. $Fe$ and $CO$

  5. Diamond and Graphite
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\displaystyle  NH^+ _4$  and $\displaystyle  H _3O^+$  have coordinate covalent bonds.
$\displaystyle  NH^+ _4$ is formed by a coordinate covalent bond between $\displaystyle  NH _3$  and $\displaystyle  H^+$.
$\displaystyle  H _3O^+$ is formed by a coordinate covalent bond between $\displaystyle  H _2O$  and $\displaystyle  H^+$. 

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

Which of the following compounds contain a coordinate covalent bond?

  1. $Ba{Cl} _{2}$
  2. $CaCl$
  3. ${K} _{2}O$
  4. ${N} _{2}{H} _{3}^{+}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$\displaystyle {N} _{2}{H} _{3}^{+}$ contain a coordinate covalent bond.
$\displaystyle H-N=\underset{\displaystyle \underset{\displaystyle H}{\downarrow}}{N}^+-H$
The N atom is the donor atom and H atom is the acceptor atom.

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.