# Chemical Bonds Test 1

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:When sodium and chlorine reacts then

Energy is released and ionic bond is formed

Energy is released and a covalent bond is formed

Energy is absorbed and ionic bond is formed

Energy is absorbed and covalent bond is formed

## Questions 2 of 50

Question:Which one is least ionic in the following compounds

$$AgCl$$

$$KCl$$

$$BaC{l_2}$$

$$CaC{l_2}$$

## Questions 3 of 50

Question:Electrovalent compounds do not have

High M.P. and Low

B.P.High dielectric constant

High M.P. and High

B.P.High polarity

## Questions 4 of 50

Question:Many ionic crystals dissolve in water because

Water is an amphiprotic solvent

Water is a high boiling liquid

The process is accompanied by a positive heat of solution

Water decreases the interionic attraction in the crystal lattice due to solvation

## Questions 5 of 50

Question:A number of ionic compounds e.g. $$AgCl,\,\,Ca{F_2},$$$$BaS{O_4}$$ are insoluble in water. This is because

Ionic compounds do not dissolve in water

Water has a high dielectric constant

Water is not a good ionizing solvent

These molecules have exceptionally high alternative forces in the lattice

## Questions 6 of 50

Question:What is the nature of chemical bonding between $$Cs$$ and $$F$$

Covalent

Ionic

Coordinate

Metallic

## Questions 7 of 50

Question:Highest melting point would be of

$$He$$

$$CsCl$$

$$N{H_3}$$

$$CHC{l_3}$$

## Questions 8 of 50

Question:What is the effect of more electronegative atom on the strength of ionic bond

Decreases

Increases

Decreases slowly

Remains the same

## Questions 9 of 50

Question:Electrolytes are compound containing

Electrovalent bond

Covalent bond

Coordinate bond

Hydrogen bond

## Questions 10 of 50

Question:Which of the following hydrides are ionic

$$Ca{H_2}$$

$$Ba{H_2}$$

$$Sr{H_2}$$

$$Be{H_2}$$

## Questions 11 of 50

Question:Which among the following elements has the tendency to form covalent compounds

$$Ba$$

$$Be$$

$$Mg$$

$$Ca$$

## Questions 12 of 50

Question:Silicon has 4 electrons in the outermost orbit. In forming the bonds

It gains electrons

It loses electrons

It shares electrons

None of these

## Questions 13 of 50

Question:The bond between two identical non-metal atoms has a pair of electrons

Unequally shared between the two

Transferred fully from one atom to another

With identical spins

Equally shared between them

## Questions 14 of 50

Question:The valency of phosphorus in $${H_3}P{O_4}$$is

2

5

4

1

## Questions 15 of 50

Question:If the electronic configuration of $$M = 2,\,\,8,\,\,3$$ and that of $$A = 2,\,\,8,\,\,7,$$ the formula of the compound is

$${M_2}{A_3}$$

$$M{A_2}$$

$${M_2}A$$

$$M{A_3}$$

$${M_3}A$$

## Questions 16 of 50

Question:If a molecule $${X_2}$$ has a triple bond, then $$X$$will have the electronic configuration

$$1{s^2}\,\,2{s^2}\,2{p^5}$$

$$1{s^2}\,\,2{s^2}\,2{p^3}$$

$$1{s^2}\,2{s^1}$$

$$1{s^2}\,2{s^2}\,2{p^1}$$

## Questions 17 of 50

Question:Which type of bond is present in $${H_2}S$$ molecule

Ionic bond

Covalent bond

Co-ordinate

All of three

## Questions 18 of 50

Question:$${H_2}S$$ is more acidic than $${H_2}O$$, due to

$$O$$ is more electronegative than $$S$$

$$O - H$$ bond is stronger than $$S - H$$ bond

$$O - H$$ bond is weaker than $$S - H$$ bond

None of these

## Questions 19 of 50

Question:The bond that exists between $$N{H_3}$$ and $$B{F_3}$$is called

Electrovalent

Covalent

Coordinate

Hydrogen

## Questions 20 of 50

Question:Which of the following does not have a coordinate bond

$$S{O_2}$$

$$HN{O_3}$$

$${H_2}S{O_3}$$

$$HN{O_2}$$

## Questions 21 of 50

Question:The unequal sharing of bonded pair of electrons between two atoms in a molecule causes

Dipole

Covalent bond

Decomposition of molecule

## Questions 22 of 50

Question:Which of the following will show least dipole character

Water

Ethanol

Ethane

Ether

## Questions 23 of 50

Question:Which of the following has zero dipole moment

$$C{H_2}C{l_2}$$

$$C{H_4}$$

$$N{H_3}$$

$$P{H_3}$$

## Questions 24 of 50

Question:Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that $$B{F_3}$$ has no dipole moment but $$P{F_3}$$ does

$$B{F_3}$$is not spherically symmetrical but $$P{F_3}$$ is

$$B{F_3}$$molecule must be linear

The atomic radius of $$P$$ is larger than the atomic radius of $$B$$

The $$B{F_3}$$ molecule must be planar triangular

## Questions 25 of 50

Question:$$B{F_3}$$ and $$N{F_3}$$both molecules are covalent, but $$B{F_3}$$ is non-polar and $$N{F_3}$$ is polar. Its reason is

In uncombined state boron is metal and nitrogen is gas$$B - F$$

bond has no dipole moment whereas $$N - F$$ bond has dipole moment

The size of boron atom is smaller than nitrogen

$$B{F_3}$$ is planar whereas $$N{F_3}$$ is pyramidal

## Questions 26 of 50

Question:According to Fajanâ€™s rule, covalent bond is favoured by

Large cation and small anion

Large cation and large anion

Small cation and large anion

Small cation and small anion

## Questions 27 of 50

Question:$$\pi$$bond is formed

By overlapping of atomic orbitals on the axis of nuclei

By mutual sharing of pi electron

By sidewise overlapping of half filled p-orbitals

By overlapping of s-orbitals with p-orbitals

## Questions 28 of 50

Question:The central atom in a molecule is in $$s{p^2}$$ hybrid state. The shape of molecule will be

Pyramidal

Tetrahedral

Octahedral

Trigonal planar

## Questions 29 of 50

Question:For which of the following hybridisation the bond angle is maximum

$$s{p^2}$$

$$sp$$

$$s{p^3}$$

$$ds{p^2}$$

## Questions 30 of 50

Question:When two pairs of electrons are shared, bond is

Single covalent bond

Double covalent bond

Dative bond

Triple bond

## Questions 31 of 50

Question:The compound in which $${C^*}$$ uses $$s{p^3}$$hybrids for bond formation is

$$H\mathop C\limits^ + OOH$$

$${(N{H_2})_2}\mathop C\limits^ + O$$

$${(N{H_3})_3}\mathop C\limits^ + OH$$

$$HgC{l_2}$$

## Questions 32 of 50

Question:As the $$p -$$character increases, the bond angle in hybrid orbitals formed by $$s$$ and atomic orbitals

Decreases

Increases

Doubles

Remains unchanged

## Questions 33 of 50

Question:When the hybridisation state of carbon atom changes from $$s{p^3}$$to $$s{p^2}$$to $$sp,$$ the angle between the hybridised orbitals

Decreases considerably

All of these

## Questions 34 of 50

Question:The correct order of hybridization of the central atom in the following species $$N{H_3}$$ $${[PtC{l_4}]^{2 - }},\,PC{l_5}$$ and $$BC{l_3}$$ is

$$ds{p^2},\,\,ds{p^3},\,\,s{p^2}$$and $$s{p^3}$$

$$s{p^3},\,\,ds{p^2},\,\,ds{p^3},\,\,s{p^2}$$

$$ds{p^2},\,\,s{p^2},\,\,s{p^3},\,\,ds{p^3}$$

$$ds{p^2},\,\,s{p^3},\,\,s{p^2},\,\,ds{p^3}$$

## Questions 35 of 50

Question:Which of the following compounds doesnâ€™t have linear structure

$$C{O_2}$$

$$S{O_2}$$

$$BeC{l_2}$$

$${C_2}{H_2}$$

## Questions 36 of 50

Question:The molecule of $$C{O_2}$$ has $${\rm{18}}0^\circ$$ bond angle. It can be explanid on the basis of

$$s{p^3}$$ hybridization

$$s{p^2}$$ hybridization

$$sp$$ hybridization

$${d^2}s{p^3}$$ hybridization

## Questions 37 of 50

Question:Hybridisation of central atom in $$N{F_3}$$ is

$$s{p^3}$$

$$sp$$

$$s{p^2}$$

$$ds{p^2}$$

## Questions 38 of 50

Question:Which has the least bond angle

$$N{H_3}$$

$$Be{F_2}$$

$${H_2}O$$

$$C{H_4}$$

## Questions 39 of 50

Question:Which of the following molecules does not have a linear arrangement of atoms

$${H_2}S$$

$${C_2}{H_2}$$

$$Be{H_2}$$

$$C{O_2}$$

## Questions 40 of 50

Question:In $$Br{F_3}$$ molecule,the lone pairs occupy equatorial positions to minimize

Lone pair- lone pair repuilsion and lone pair-bond pair repulsion

Lone pair- lone pair repulsion only

Lone pair- bond pair repulsion only

Bond pair- bond pair repulsion only

## Questions 41 of 50

Question:Molecular orbital theory was developed mainly by

Pauling

Pauling and Slater

Mulliken

Thomson

## Questions 42 of 50

Question:An atom of an element A has three electrons in its outermost shell and that of B has six electrons in the outermost shell. The formula of the compound between these two will be

$${A_3}{B_4}$$

$${A_2}{B_3}$$

$${A_3}{B_2}$$

$${A_2}{B}$$

## Questions 43 of 50

Question:If $${N_x}$$is the number of bonding orbitals of an atom and $${N_y}$$ is the number of antibonding orbitals, then the molecule/atom will be stable if

$${N_x} > {N_y}$$

$${N_x} = {N_y}$$

$${N_x} < {N_y}$$

$${N_x} \le {N_y}$$

## Questions 44 of 50

Question:In $${H_2}{O_2}$$molecule, the angle between the two O â€“ H planes is

$${90^o}$$

$${101^o}$$

$${103^o}$$

$${105^o}$$

## Questions 45 of 50

Question:According to molecular orbital theory which of the following statement about the magnetic character and bond order is correct regarding $$O_2^ +$$

Paramagnetic and bond order<$${O_2}$$

Paramagnetic and bond order>$${O_2}$$

Dimagnetic and bond order<$${O_2}$$

Dimagnetic and bond order>$${O_2}$$

## Questions 46 of 50

Question:In the following which has highest boiling point

$$HI$$

$$HF$$

$$HBr$$

$$HCl$$

## Questions 47 of 50

Question:The bond that determines the secondary structure of a protein is

Coordinate bond

Covalent bond

Hydrogen bond

Ionic bond

## Questions 48 of 50

Question:Ethanol and dimethyl ether form a pair of functional isomers. The boiling point of ethanol is higher than that of dimethyl ether due to the presence of

Hydrogen bonding in ethanol

Hydrogen bonding in dimethyl ether

$$C{H_3}$$ group in ethanol

$$C{H_3}$$ group in dimethyl ether

## Questions 49 of 50

Question:In a crystal cations and anions are held together by

Electrons

Electrostatic forces

Nuclear forces

Covalent bonds

## Questions 50 of 50

Question:Both ionic and covalent bond is present in the following

$$C{H_4}$$
$$KCl$$
$$S{O_2}$$
$$NaOH$$