Chemical Bonds Test 1

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:When sodium and chlorine reacts then

Answers Choices:

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

Answers Choices:

\(AgCl\)

\(KCl\)

\(BaC{l_2}\)

\(CaC{l_2}\)

Questions 3 of 50

Question:Electrovalent compounds do not have

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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 \(F\)

Answers Choices:

Covalent

Ionic

Coordinate

Metallic

Questions 7 of 50

Question:Highest melting point would be of

Answers Choices:

\(He\)

\(CsCl\)

\(N{H_3}\)

\(CHC{l_3}\)

Questions 8 of 50

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

Answers Choices:

Decreases

Increases

Decreases slowly

Remains the same

Questions 9 of 50

Question:Electrolytes are compound containing

Answers Choices:

Electrovalent bond

Covalent bond

Coordinate bond

Hydrogen bond

Questions 10 of 50

Question:Which of the following hydrides are ionic

Answers Choices:

\(Ca{H_2}\)

\(Ba{H_2}\)

\(Sr{H_2}\)

\(Be{H_2}\)

Questions 11 of 50

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

Answers Choices:

\(Ba\)

\(Be\)

\(Mg\)

\(Ca\)

Questions 12 of 50

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

\({M_2}{A_3}\)

\(M{A_2}\)

\({M_2}A\)

\(M{A_3}\)

\({M_3}A\)

Questions 16 of 50

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

Answers Choices:

\(1{s^2}\,\,2{s^2}\,2{p^5}\)

\(1{s^2}\,\,2{s^2}\,2{p^3}\)

\(1{s^2}\,2{s^1}\)

\(1{s^2}\,2{s^2}\,2{p^1}\)

Questions 17 of 50

Question:Which type of bond is present in \({H_2}S\) molecule

Answers Choices:

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

Answers Choices:

\(O\) 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

Answers Choices:

Electrovalent

Covalent

Coordinate

Hydrogen

Questions 20 of 50

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

Answers Choices:

\(S{O_2}\)

\(HN{O_3}\)

\({H_2}S{O_3}\)

\(HN{O_2}\)

Questions 21 of 50

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

Answers Choices:

Dipole

Radical formation

Covalent bond

Decomposition of molecule

Questions 22 of 50

Question:Which of the following will show least dipole character

Answers Choices:

Water

Ethanol

Ethane

Ether

Questions 23 of 50

Question:Which of the following has zero dipole moment

Answers Choices:

\(C{H_2}C{l_2}\)

\(C{H_4}\)

\(N{H_3}\)

\(P{H_3}\)

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

Answers Choices:

\(B{F_3}\)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

Answers Choices:

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 Fajan’s rule, covalent bond is favoured by

Answers Choices:

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

Answers Choices:

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

Answers Choices:

Pyramidal

Tetrahedral

Octahedral

Trigonal planar

Questions 29 of 50

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

Answers Choices:

\(s{p^2}\)

\(sp\)

\(s{p^3}\)

\(ds{p^2}\)

Questions 30 of 50

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

Answers Choices:

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

Answers Choices:

\(H\mathop C\limits^ + OOH\)

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

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

\(HgC{l_2}\)

Questions 32 of 50

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

Answers Choices:

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

Answers Choices:

Decreases gradually

Increases gradually

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

Answers Choices:

\(ds{p^2},\,\,ds{p^3},\,\,s{p^2}\)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 doesn’t have linear structure

Answers Choices:

\(C{O_2}\)

\(S{O_2}\)

\(BeC{l_2}\)

\({C_2}{H_2}\)

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

Answers Choices:

\(s{p^3}\) 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

Answers Choices:

\(s{p^3}\)

\(sp\)

\(s{p^2}\)

\(ds{p^2}\)

Questions 38 of 50

Question:Which has the least bond angle

Answers Choices:

\(N{H_3}\)

\(Be{F_2}\)

\({H_2}O\)

\(C{H_4}\)

Questions 39 of 50

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

Answers Choices:

\({H_2}S\)

\({C_2}{H_2}\)

\(Be{H_2}\)

\(C{O_2}\)

Questions 40 of 50

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

\({A_3}{B_4}\)

\({A_2}{B_3}\)

\({A_3}{B_2}\)

\({A_2}{B}\)

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

Answers Choices:

\({N_x} > {N_y}\)

\({N_x} = {N_y}\)

\({N_x} < {N_y}\)

\({N_x} \le {N_y}\)

Questions 44 of 50

Question:In \({H_2}{O_2}\)molecule, the angle between the two O – H planes is

Answers Choices:

\({90^o}\)

\({101^o}\)

\({103^o}\)

\({105^o}\)

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 \(O_2^ + \)

Answers Choices:

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

Answers Choices:

\(HI\)

\(HF\)

\(HBr\)

\(HCl\)

Questions 47 of 50

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

Electrons

Electrostatic forces

Nuclear forces

Covalent bonds

Questions 50 of 50

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

Answers Choices:

\(C{H_4}\)

\(KCl\)

\(S{O_2}\)

\(NaOH\)