Tag: chemical bonding and structure

Questions Related to chemical bonding and structure

Co-ordinate covalent compounds dissolve more in:

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

  1. polar solvents

  2. non polar solvents

  3. both polar and nonpolare compounds

  4. water only

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Correct Option: A
Explanation:

Coordinate covalent components have la slight dipole moment. So they are less solube in nonpolar solvents compared to polar solvents.

In which of the following, all four types of bonds, i.e., ionic, covalent, dative and hydrogen bonds are present?

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

  1. $Ice$

  2. $BeSO _{4}.4H _{2}O$

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

  4. $BaCl _{2}.2H _{2}O$

Show answer
Correct Option: C
Explanation:

$CuSO _4\cdot 5H _2O$ exists as $[Cu(H _2O) _4]^{2+} SO _{4}^{2-}\cdot H _2O$.
It has dative bonds in $[Cu(H _2O) _4]^{2+}$, which is between water molecules and Cu. There is an ionic bond between the coordination sphere and $SO _4^{2-}$ ion. Covalent bond between S and O in  in $SO _4^{2-}$ ions and between H and O in water molecules Within the molecules of $H _2O$, there is hydrogen bonding. 

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. Water

  2. Ammonia

  3. Ammonium ion

  4. Ethylene

Show answer
Correct Option: C
Explanation:

In $NH _4^+$ the $N$ forms a co-ordinate covalent bond with one $H$ by utilizing the lone pair of electrons.

Name an ion which combines with a polar covalent molecule to form an ammonium ion?

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

  1. Hydrogen

  2. Chlorine

  3. Fluorine

  4. All of these

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Correct Option: A
Explanation:

Ammonium ions are formed by transfer of a hydrogen ion from HCl to the lone pair of electrons on the ammonia molecule.

Two elements have electronegativity of $1.2$ and $3.0$. Bond formed between them would be :

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

  1. ionic

  2. polar covalent

  3. co-ordinate

  4. metallic

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Correct Option: A
Explanation:

The electronegativity difference between the two atoms is $3.0 - 1.2 = 1.8$. It is large, hence, the bond formed is an ionic bond. The more electronegative atom gains one or more electrons to form an anion and the less electronegative atom loses one or more electrons to form a cation. 

A co-ordinate bond is formed when atom in a molecule has:

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

  1. all its valency shell electrons shared

  2. a single unshared electron

  3. one or more unshared electron pair

  4. electric charge on it

Show answer
Correct Option: C
Explanation:

A co-ordinate or dative bond is a covalent bond(a shared pair of electrons) in which both the electrons come from the same atom. It is shown by an arrow and the arrow points from atom donating the lone pair to accepting atom.$\quad \quad H\ \quad \quad \quad |\ H-{ N }^{ + }\rightarrow H\ \quad \quad \quad |\ \quad \quad H$

The type of bonds present in $CuSO 4.\, 5H _2O$ are__________.

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

  1. electrovalent, covalent and coordinate

  2. electrovalent and covalent

  3. electrovalent and coordinate

  4. covalent and coordinate

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Correct Option: A
Explanation:

A covalent bond is formed between sulfur and oxygen as they both are non metals and the bond between copper and sulfate is ionic one is metal and other non metal. Hydrated coppersulfate is a complex which is bonded to water molecules acting as ligands forming coordinate bond.

What is a coordination compound?

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

  1. A metal atom or ion bonded by covalent bonds to ligands.

  2. Any atom bonded by ionic bonds to other atoms.

  3. Any atom bonded by covalent bonds to other atoms.

  4. A compound with covalent bonds.

  5. A metal atom bonded by ionic bonds to ligands.

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Correct Option: A
Explanation:

A coordination compound is a metal atom or ion bonded by covalent bonds to ligands. For example, tetra carbonyl nickel $\displaystyle  Ni(CO) _4$ is a coordination compound with the metal atom ($Ni$ atom) which forms covalent bonds with $4$ $CO$ ligands.

Which of the following molecule can combine with a proton $(H^{+})$?

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

  1. $NH _{3}$

  2. $Na^{+}$

  3. $HCl$

  4. $H _{3}O^{+}$

  5. $H$

Show answer
Correct Option: A
Explanation:

The molecules already having positive charge $(Na^+ $ and $ H _3O^+) $ means that they are electron deficient and they can not combine with another proton $(H^+)$. $HCl$ is an acid, that releases a proton. Ammonia $NH _3$ acts as a base because, the unshared pair of electrons in the ammonia molecule can combine with a proton, forming the ammonium $(NH _4^+)$ ion. 

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.

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

  1. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion

  2. Both Assertion and Reason are correct and Reason is not  the correct explanation of Assertion

  3. Assertion is correct but Reason is not correct

  4. Assertion is not correct but Reason is correct

  5. Both the Assertion and Reason are not correct

Show answer
Correct Option: E
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.