Chemistry

Chemical Bonding and Molecular Structure

1,420 Questions

This section tests your knowledge of chemical bonding, molecular structure, and hybridization. It covers ionic and covalent bonds, octet rule exceptions, and molecular geometry. These chemistry questions are common in various competitive entrance examinations.

Ionic and covalent bondsHybridisation of elementsOctet rule exceptionsMolecular geometryIntermolecular forces

Chemical Bonding and Molecular Structure Questions

Multiple choice chemistry atoms, molecules and radicals molecular formula and valency valency and chemical formulae combining capacity and chemical formulae

Electrovalencies of three metals $A, B, C $are $1, 2, 3$ respectively and those of non-metals $X, Y, Z$ and $3, 2, 1$ respectively. Which among the following couldn't be the formula of the various ionic compounds formed between the respective metals and non-metals?

  1. $A _3 X, BY, CZ _3$
  2. $AZ, B _3 X _2, C _2 Y _3$
  3. $AZ _3, B _2X, C _3Y _2$
  4. $A _2Y, BZ _2, CX$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The incorrect formula's are; $AZ _{3}$, $B _{2}X$, $C _{3}Y _{2}$

Multiple choice physics electric charges and fields potential energy of a dipole in external field potential due to electric dipole electric dipole

Carbon tetrachloride has zero dipole moment because of ________.

  1. planar structure

  2. Smaller size of C and Cl atoms

  3. regular tetrahedral structure

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon tetrachloride molecule has zero dipole moment even though C and Cl have different electronegativities and each of the C - Cl bond is polar and has some dipole moment. This is because the individual dipole moments cancel out because of the symmetrical tetrahedral shape of the molecule.



Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Statement 1: One mole of NaCl contains $2$ moles of ions.
Statement 2: NaCl is a stable salt at room temperature.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct.</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct.</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct</p>
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Option (B) is correct.

Statement 1:  One mole of $NaCl$ contains 2 moles of ions i.e. a mole of chloride and a mole of sodium.Every $NaCl$ molecules has a $Na$ and a $Cl^-$ atom. So, if you have $6.022x10^{23}$ molecules, you will have that same number of $Na$ atoms and $Cl^-$ atoms, and by definition, 1 mole is $6.022x10^{23} $atoms.

Statement 2: $NaCl$ is a stable salt at room temperature.Sodium and chlorine forms a strong ionic bond, completing the octet of both atoms.They are arranged in a face centered cubic crystal structure where each $Na^+$ or $Cl^-$ ion is surrounded by 6 of the opposite ions forming an octahedron. This makes sodium chloride a stable compound.

Multiple choice chemistry substances in common use salts and their properties study of some important salts salts used in daily life

Statement 1: Crystals of sodium chloride go into aqueous solution as ions.
Statement 2: The sodium ion has a $1+$ change and the chloride ion has a $1-$ charge and they are hydrated by the water molecules.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct.</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct.</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct. </p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement 1: Crystals of sodium chloride go into aqueous solution as ions.
$\displaystyle NaCl \rightleftharpoons Na^+ (aq) + Cl^- (aq) $
Statement 2: The sodium ion has a $1+$ change and the chloride ion has a $1−$ charge and they are hydrated by the water molecules.
Each sodium ion ( or each chloride ion) is surrounded by several water molecules.
Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

Multiple choice biology food and health adulteration of food food adulteration food and human health

Dropsy : Argemone oil :: ............. : Minamata

  1. Methyl cyanide

  2. Methyl bromide

  3. Methyl chloride

  4. Methyl mercury
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Dropsy is the condition which is caused by the consumption of the cooking oil adulterated with argemone oil. The disease is represented by gastrointestinal problems and swelling of the body. 
  • Minamata disease is caused due to the consumption of the fishes which was contaminated with methyl mercury released in the water bodies as a waste from the industries. 
  • The fishes died due to mercury accumulation and people suffered from mercury poisoning after the consumption of the fishes. 
  • Thus, the correct answer is option D. 
Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements biological importance of sodium and potassium

Nitrolim is a mixture of :

  1. $CaC _2$ and graphite
  2. $CaCN _2$ and graphite
  3. $Ca(CN) _2$ and graphite
  4. $CaCN _2+N _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 $CaC _2 +N _2\longrightarrow CaCN _2 +C$

When nitrogen is passed over calcium carbide at a suitable high temperature, we get a mixture of $CaCN _2 + Graphite (C)$ known as nitrolim which is a nitrogenous fertiliser." 

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

What is not a polyhalogen?

  1. Methyl chloride

  2. Dichloro methane

  3. Chloroform

  4. Carbon tetrachloride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A polyhalogen compound contains more than one halogen atom in its molecule. Methyl chloride (CH3Cl) contains only one chlorine atom, making it a monohalogen compound, not a polyhalogen.

Multiple choice polyhalogen compounds haloalkanes and haloarenes chemistry

Which of the following is used in paint removing ?

  1. $CHCl _{3}$
  2. $CH _{2}Cl _{2}$
  3. $CCl _{4}$
  4. $CH _{3}Cl$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$CHCl _3$ is used as solvent and as an anaesthetic.

$CCl _4$ is used as a fire extinguisher.
$CH _2Cl _2$ is used as paint removing.
$CH _3Cl$ is used as a refrigerant.

Hence, the correct option is B.

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

Amongst the following, the strongest base in aqueous medium is ____________. 

  1. $CH _3NH _2$
  2. $NCCH _2NH _2$
  3. $(CH _3) _2NH$
  4. $C _6H _5NHCH _3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

${2}^{0}$ amine is strongest base in aqucous media.

order of basicly in aq. media  ${ 2 }^{ 0 }>{ 1 }^{ 0 }>{ 3 }^{ 0 }$ (amines)
in gaseous phase it is ${ 3 }^{ 0 }>{ 2 }^{ 0 }>{ 1 }^{ 0 }$ (amines)

Multiple choice isomerism of amines organic compounds with functional group containing nitrogen

Which of the following statements concerning cyclic amines is correct?

  1. they can never be primary amines

  2. they are mostly aromatic compounds

  3. they can be primary or secondary amines but never tertiary amines

  4. they are only found as naturally-occurring compounds
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cyclic amines can never be primary amines, as their valency is already satisfied (2 of its valency) by the carbon chain.