Tag: chemistry

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Multiple choice chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

Covalent compounds are usually water soluble.

  1. True

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

A covalent bond is formed between non metal atoms, which combine together by sharing electrons. covalent compounds have low melting points, do not dissolve in water, and do not conduct an electric current in solution that make them non-polar. 
Thus, Option "B" is correct.

Multiple choice chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

Which of the following is not a characteristic of a covalent compound :-

  1. It has low melting point and boiling point

  2. It is formed between two atoms having no or very small electronegativity difference

  3. They have no definit geometry

  4. They are generally insouble in water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Covalent bonds are directional, meaning that atoms so bonded prefer specific orientations relative to one another, hence they have distinct geometries.

Multiple choice chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

Which of the following statements is not true about covalent compounds:-

  1. They may exhibit space isomersim

  2. They have-low melting and boiling points

  3. They show ionic reaction

  4. They show molecular reaction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Covalent compounds do not show ionic reaction. 


Example: Free radical halogenation of alkanes in the presence of sunlight.
Hydrogenation of alkenes.

Multiple choice chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

Which of the following represents the correct increasing order of forces of attraction between the molecules?

  1. Oxygen, Sodium chloride, Mercury, Water, Hydrogen chloride

  2. Oxygen, Hydrogen chloride, Water, Mercury, Sodium chloride

  3. Oxygen, Water, Hydrogen chloride, Mercury, Sodium chloride

  4. Oxygen, Mercury, Water, Hydrogen chloride, Sodium chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The increasing order of forces of attraction between the molecules can be written as;
$O _{2}$(weak Van der waal forces) < HCl( dipole-dipole interactions) < $H _{2}O$( hydrogen bonding) < Hg( metallic bond) < NaCl (ionic bonding)

Multiple choice chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

A solid which is transparent to visible light and whose conductivity increases with temperature is formed by :

  1. Metallic binding

  2. Ionic binding

  3. Covalent binding

  4. Van der Waals binding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A solid which is transparent to visible light and whose conductivity increases with temperature is
formed by covalent bonding, like a semi conductor.

Multiple choice chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

Compounds evaporating easily and giving off a smell are?

  1. Ionic compounds

  2. Covalent bonds

  3. Metallic bonds

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

Covalent compounds have negligible forces of attraction and these are gases e.g. $HCl$, sulfur dioxide,carbon dioxide and methane. There are weak forces of attraction and such covalent substances are low boiling temperature liquids such as ethanol so boils rapidly and gives off smell.

Multiple choice chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

The electronic configuration of elements A, B, C, D and E are :
A (2, 8, 7)       B (2, 8, 1)       C (2)          D (2, 6)        E(2, 8)
If elements A & B combine to form a compound then its chemical formula would be _______ .

  1. $BA$
  2. $B _2A$
  3. $2BA$
  4. $BA _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the above question element A is equivalent to chlorine& B to sodium thus the structure besides shows the bonding giving rise to $NaCl$ Hence for our eg, it is $BA$.

Multiple choice chemistry chemical bond and chemical equation properties of covalent compounds types of bonds and properties covalent bond

Maximum number of bonds between two atoms of a covalent bond can be:

  1. four

  2. three

  3. two

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

Covalent bonds between atoms are quite strong, but attractions between molecule/compounds  or intermolecular forces, can be relatively weak. Covalent compounds generally have low boiling and melting points, and are found in all three physical states covalent bonds between atoms are quite strong, but attractions between molecules/compounds or intermolecular forces, can be relatively work. Covalent compounds generally have low boiling and melting points, and are found in all three physical states at room temperature. at room temperature.