Chemistry

Chemical Bonding and Molecular Structure

1,277 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 general knowledge

The chemical symbol for Potassium is "P"

  1. True

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

Potassium's chemical symbol is K, derived from its Latin name 'Kalium'. The symbol P represents Phosphorus, a completely different element. Chemical symbols often come from Latin or Greek names rather than English.

Multiple choice general knowledge

What is PETN?

  1. Pentaerythritol tetranitrate

  2. Powdered Explosive TNT

  3. Pentoerythritol tetranitramine

  4. Pentaerythrital tetranitramine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

PETN is a high-brisance explosive meaning it creates a powerful shattering effect. The full chemical name is Pentaerythritol Tetranitrate. Options C and D have spelling errors ('pentoerythrital', 'tetranitramine'). Option B is incorrect - PETN and TNT are different explosives.

Multiple choice general knowledge science & technology

The most expensive substance in the world is

  1. cesium

  2. californium

  3. nobium

  4. anthracene
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Californium is considered the most expensive substance in the world, costing approximately $27 million per gram. It is a radioactive element with very limited production and specialized applications in nuclear reactors and detectors. Cesium, niobium, and anthracene are much more common and less expensive.

Multiple choice general knowledge

What is the chemical formula for ice ?

  1. N2O

  2. H2O

  3. NO2

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ice is solid water, so its chemical formula remains H2O (two hydrogen atoms bonded to one oxygen atom). Freezing water doesn't change its chemical composition, only its physical state. N2O is nitrous oxide and NO2 is nitrogen dioxide.

Multiple choice general knowledge science & technology

what is the name of this organic compound:C6H6OH?

  1. catechol

  2. hydroquinone

  3. resorcinol

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The formula C6H6OH is chemically ambiguous/imprecise notation. However, looking at the options: catechol (benzene-1,2-diol), hydroquinone (benzene-1,4-diol), and resorcinol (benzene-1,3-diol) are all benzene diols with formula C6H6O2 (properly C6H4(OH)2). The notation C6H6OH poorly represents any of these, making the question chemically inaccurate, though D is marked correct.

Multiple choice

Select the correct opinion for nido-boranes using the boranes given below: (i) B5H9

(ii) B4H10

(iii) B5H11

(iv) B6H12

(v) B6H10

(vi) B8H12

  1. i, ii and iv

  2. ii, iii and vi

  3. i, ii and v

  4. ii, iii and iv

  5. i, v and vi
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The structural formula for nido-borane is BnHn+4 and the structural formula for arachno-borane is BnHn+6. B5H9 is nido-borane. B4H10 is arachno-borane. B5H11 is arachno-borane. B6H12 is arachno-borane. B6H10 is nido-borane. B8H12 is nido-borane. Hence, i, v and  vi are nido-boranes.

Multiple choice

When cation and anion both are missing from their regular sites in an ionic solid, then what are the defects called?

  1. Frenkel defects

  2. Schottky defects

  3. Interstitial defects

  4. Vacancy defects

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is correct. When cations and anions both are missing from regular sites, the defect is called Schottky defect. In Schottky defects, the number of missing cations is equal to the number of missing anions in order to maintain the electrical neutrality of the ionic compound.

Multiple choice

CaC2 is associated with which types of bonds?

  1. One sigma and two pi

  2. One sigma and one pi

  3. Two sigma and one pi

  4. Two sigma and two pi

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbide ion is C22- and is structured with two carbons with triple bond, i.e. one sigma, two pi.