Tag: coordinate bond

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Questions Related to coordinate 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 arrow from donor to acceptor.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coordinate covalent bond is represented by an arrow from donor to acceptor.

Eg:NO $[NH _3 \to H]^+$
Coordinate covalent bond means donating a lone pair of electron of one atom to a vacant orbital of another atom.

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

Which of the following types of solid is most likely to be soft, have low melting point and don't conduct electricity when melted?

  1. Ionic

  2. Molecular

  3. Covalent

  4. Metallic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Covalent compunds are soft(due to presence of cloud of electrons between the bonding atoms), have low melting point(due to weak forces of attraction) and are bad conductors of electricity in the molten state(due to lack of free electrons)

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

In the coordinate covalency,

  1. electrons are equally shared by the atoms

  2. electrons of one atom are shared between the two atoms

  3. hydrogen bond is formed

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The 2 electrons of an atom( generally lone pair) is donated by one atom to the other atom and it results in the formation of a coordinate bond.

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

During the formation of hydronium ion, water molecule acts as donor.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A hydronium ion is written as ${ H } _{ 3 }{ O }^{ + }$. 

It is formed when something else donates a proton, or $H^+$ to a water molecule.
The $H^+$ will easily bond to one of the two lone pairs of electrons around the water molecule.

     ${ H }^{ + }+{ H } _{ 2 }O\longrightarrow { H } _{ 3 }{ O }^{ + }$

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

Which response includes only the true statements concerning the characteristics of covalent compounds?
$I$. These compounds can be gases, liquids, or solids with low melting points.
$II$. Most are soluble in polar solvents.
$III$. Liquid and molten compounds do not conduct electricity.
$IV$. Aqueous solutions of these compounds are very good conductors of electricity.

  1. $I$ and $III$
  2. $II$ and $IV$
  3. $I,III$ and $IV$
  4. $I,II$ and $III$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

I , II and III statement about covalent compounds are correct but the IV one is not correct since the aqueous solution of the covalent compound do not contain free ions and thus are not the good conductors of electricity .

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

The pH of pure water at 25°C and 35°C are 7 and 6 respectively. The heat of formation  of water from ${H^ - }$  and $O{H^ - }$ will be :

  1. -77.11

  2. -84.55

  3. -92.36

  4. -66.25
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The auto-ionization of water is H2O <-> H+ + OH-. The heat of formation is related to the change in equilibrium constant (Kw) with temperature. The value -77.11 kJ/mol is the standard enthalpy change for this process.