Tag: chemical bonding and structure

Questions Related to chemical bonding and structure

"Hybridisation of central atom does not always change due to back bonding". This statement is valid for which of the following compounds ? 
(i) $CCl^- _3$                      (ii) $CCl _2$
(iii) $(SiH _3) _2 O$              (iv) $N(SiH _3) _3$

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

  1. (i), (ii)

  2. (i), (iii)

  3. (ii), (iii)

  4. All

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Correct Option: A
Explanation:

When there is back bonding from central to side atom change in hybridization takes place. Back bonding takes place when one atom has vacant orbital and one has lone pairs. 
So central atom has a lone pair and side atom must have vacant orbital 
So : $CCl^- _3$
$N (SiH _3) _3$
$Sp^3 - Sp^2$

Which of the following compound has coordinate (dative) bond :

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

  1. $CH _3NC$

  2. $CH _3OH$

  3. $CH _3Cl$

  4. $NH _3$

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Correct Option: D

Dative bond is present in ____________.

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

  1. Carbon monoxide

  2. Carbon dioxide

  3. Nitric oxide

  4. Dichlorine monoxide

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Correct Option: A,C
Explanation:

Carbon monoxide and nitric oxide contains dative bond or coordinate covalent bond whereas carbon dioxide and dichlorine monoxide contains covalent bonds.

Which of the following molecules does not have co-ordinate bonds?

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

  1. $PH _{4}^{+}$

  2. $NO _2$

  3. $O _3$

  4. $CO _{3}^{2-}$

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Correct Option: D

In the cyanide, the negative charge is on :

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

  1. $C$

  2. $N$

  3. both $C$ and $N$

  4. resonate between $C$ and $N$

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Correct Option: A
Explanation:

Hetrolytic bond dissociation of $HCN$:
$H-CN\rightarrow H^++ ^-C\equiv N$.
So here, negative charge is on $C$.

Which of the following does not have coordinate bond? 

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

  1. $S{O _2}$

  2. $HN{O _3}$

  3. ${H _2}S{O _3}$`

  4. $HN{O _2}$

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Correct Option: B

Co-ordinate covalent bond is formed by:

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

  1. transfer of electrons

  2. sharing of electrons

  3. donation of electrons

  4. none of these process

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Correct Option: C
Explanation:

Both the electrons of a coordinate bond are donated by one atom, and then shared by both the atoms of the bond.

In potassium ferrocyanide, the nature of bond between iron and cyanide ions is :

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

  1. ionic bond

  2. covalent bond

  3. dative bond

  4. polar bond

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Correct Option: C
Explanation:

In potassium ferrocyanide, iron atom has vacant orbitals and cyanide ions have unpaired electrons. Hence, in potassium ferrocyanide, the bond between iron and cyanide ions is dative bond.

Phosphorus forms a compound with hydrogen called phosphine, $PH _{3}$. This compound can react
with a hydrogen ion, $H^{+}$.
Which type of interaction occurs between $PH _{3}$ and $H^{+}$?

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

  1. Dative covalent bond

  2. Dipole- dipole forces

  3. Hydrogen bond

  4. Ionic bond

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Correct Option: A
Explanation:

The bond formed between $P{H} _{3}$ and ${H}^{+}$ is dative covalent bond in which the bonding electrons are coming from phosphine.

Coordinate compounds are formed by

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

  1. Transfer of electrons

  2. Sharing of electrons

  3. Donation of electron pair

  4. None of these

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Correct Option: C