Tag: coordinate bond

Questions Related to coordinate bond

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

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

  1. solvent

  2. donor

  3. acceptor

  4. none of these

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Correct Option: B
Explanation:

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

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

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

  1. True

  2. False

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Correct Option: A
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.

Compounds having coordinate covalent bonds are:

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

  2. $HNO _3$

  3. $NH _4^+$

  4. All of the above

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Correct Option: D
Explanation:

Compounds having coordinate covalent bonds are $CO, HNO _3, NH _4^+$.

Addition of acid to water results in the formation of:

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

  1. $H _2O$

  2. $H _3O^+$

  3. both A and B

  4. none of the above

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Correct Option: B
Explanation:

Addition of acid to water results in the formation of $H _3O^+$.

$H^++H _2O \rightarrow H _3O^+$

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

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

  1. Ionic

  2. Molecular

  3. Covalent

  4. Metallic

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Correct Option: C
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)

In the coordinate covalency,

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

  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

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Correct Option: B
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.

In which molecule co-ordinate bond is present ?

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

  1. $H _2O$

  2. $NH _3$

  3. $CH _3NO _2$

  4. $CCl _4$

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Correct Option: B

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

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

  1. True

  2. False

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Correct Option: A
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.

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

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.

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

  1. $I$ and $III$

  2. $II$ and $IV$

  3. $I,III$ and $IV$

  4. $I,II$ and $III$

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Correct Option: D
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 .

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 :

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

  1. -77.11

  2. -84.55

  3. -92.36

  4. -66.25

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Correct Option: A