# Chemical Bonds Test 2

Total Questions:50 Total Time: 60 Min

Remaining:

## Questions 1 of 50

Question:The electronic configuration of four elements L, P, Q and R are given in brackets $$L\,\left( {1{s^2},\,\,2{s^2}\,2{p^4}} \right);\,\,Q\,\left( {1{s^2},\,\,2{s^2}\,2{p^6},\,\,3{s^2}\,\,3{p^5}} \right)$$ $$P\,\left( {1{s^2},\,\,2{s^2}\,2{p^6},\,\,3{s^1}} \right);\,\,R\,\left( {1{s^2},\,\,2{s^2}\,2{p^6},\,\,3{s^2}} \right)$$ The formulae of ionic compounds that can be formed between these elements are

$${L_2}P,\,\,RL,\,\,PQ$$ and $${R_2}Q$$

$$LP,\,\,RL,\,\,PQ$$ and $$RQ$$

$${P_2}L,\,\,RL,\,\,PQ$$ and $$R{Q_2}$$

$$LP,\,\,{R_2}L,\,\,{P_2}Q$$ and $$RQ$$

## Questions 2 of 50

Question:The electronic structure of four elements A, B, C, D are (A) $$1{s^2}$$ (B) $$1{s^2},\,\,2{s^2}\,2{p^2}$$ (C) $$1{s^2},\,\,2{s^2}\,2{p^5}$$ (D) $$1{s^2},\,\,2{s^2}\,2{p^6}$$ The tendency to form electrovalent bond is largest in

A

B

C

D

## Questions 3 of 50

Question:Which one of the following compound is ionic

$$KCl$$

$$C{H_4}$$

Diamond

$${H_2}$$

## Questions 4 of 50

Question:An element X with the electronic configuration $$1{s^2},\,2{s^2}2{p^6},\,3{s^2}$$ would be expected to form the chloride with the formula

$$XC{l_3}$$

$$XC{l_2}$$

$$XCl$$

$${X_2}Cl$$

## Questions 5 of 50

Question:Which of the following conduct electricity in the fused state

$$BeC{l_2}$$

$$MgC{l_2}$$

$$SrC{l_2}$$

$$BaC{l_2}$$

## Questions 6 of 50

Question:Which of the following occurs when two hydrogen atoms bond with each others

Potential energy is lowered

Kinetic energy is lowered

Electronic motion ceases

Energy is absorbed

## Questions 7 of 50

Question:Which of the following substances has covalent bonding

Germanium

Sodium chloride

Solid neon

Copper

## Questions 8 of 50

Question:Which of the following compounds does not follow the octet rule for electron distribution

$$PC{l_5}$$

$$PC{l_3}$$

$${H_2}O$$

$$P{H_3}$$

## Questions 9 of 50

Question:Which of the following has covalent bond

$$N{a_2}S$$

$$AlC{l_3}$$

$$NaH$$

$$MgC{l_2}$$

## Questions 10 of 50

Question:Coordinate covalent compounds are formed by

Transfer of electrons

Sharing of electrons

Donation of electrons

None of these process

## Questions 11 of 50

Question:Which of the following molecules will show dipole moment

Methane

Carbon tetrachloride

Chloroform

Carbon dioxide

## Questions 12 of 50

Question:Which molecule does not show zero dipole moment

$$B{F_3}$$

$$N{H_3}$$

$$CC{l_4}$$

$$C{H_4}$$

## Questions 13 of 50

Question:Which one is polar molecule among the following

$$C{O_2}$$

$$CC{l_4}$$

$${H_2}O$$

$$C{H_4}$$

## Questions 14 of 50

Question:If the electron pair forming a bond between two atoms A and B is not in the centre, then the bond is

Single bond

Polar bond

Non-polar bond

$$\pi$$bond

## Questions 15 of 50

Question:Which of the following statements is correct

$$S{F_4}$$is polar and non-reactive

$$S{F_6}$$is non-polar and very reactive

$$S{F_6}$$is a strong fluorinating agent

$$S{F_4}$$is prepared by fluorinating $$SC{l_2}$$with $$NaF$$

## Questions 16 of 50

Question:Choose the correct statement

Amino polarisation is more pronounced by highly charged cation

Small cation has minimum capacity to polarise an anion.

Small anion has maximum polarizability

None of these

## Questions 17 of 50

Question:The double bond between the two carbon atoms in ethylene consists of

Two sigma bonds at right angles to each other

One sigma bond and one pi bond

Two pi bonds at right angles to each other

Two pi bonds at an angle of $${60^o}$$ to each other

## Questions 18 of 50

Question:In the series ethane, ethylene and acetylene, the $$C - H$$ bond energy is

The same in all the three compounds

Greatest in ethane

Greatest in ethylene

Greatest in acetylene

## Questions 19 of 50

Question:Which molecule is linear

$$N{O_2}$$

$$Cl{O_2}$$

$$C{O_2}$$

$${H_2}S$$

## Questions 20 of 50

Question:Which of the following molecules has trigonal planer geometry

$$I{F_3}$$

$$PC{l_3}$$

$$N{H_3}$$

$$B{F_3}$$

## Questions 21 of 50

Question:The $$C - H$$bond distance is the longest in

$${C_2}{H_2}$$

$${C_2}{H_4}$$

$${C_2}{H_4}B{r_2}$$

$${C_6}{H_6}$$

## Questions 22 of 50

Question:The nature of hybridization in $$C{H_2}Cl - C{H_2}Cl$$ for carbon is

$$sp$$

$$s{p^2}$$

$$s{p^3}$$

$$s{p^2}d$$

## Questions 23 of 50

Question:The nature of hybridization in the $$BC{l_3}$$ molecule is

$$sp$$

$$s{p^2}$$

$$s{p^3}$$

$$s{p^3}d$$

## Questions 24 of 50

Question:Which one of the following compounds has bond angle as nearly $${90^o}$$

$$N{H_3}$$

$${H_2}S$$

$${H_2}O$$

$$C{H_4}$$

## Questions 25 of 50

Question:$$C{H_3}\mathop C\limits^ + HO$$In diborane, the $$H - B - H$$bond angle is $${120^o}$$. The hybridization of boron is likely to be

$$sp$$

$$s{p^2}$$

$$s{p^3}$$

$$ds{p^2}$$

## Questions 26 of 50

Question:The number of shared pairs of electrons in propane is

2

4

6

10

## Questions 27 of 50

Question:$$s{p^3}$$ hybridization leads to which shape of the molecule

Tetrahedron

Octahedron

Linear

Plane triangle

## Questions 28 of 50

Question:Which of the following will be octahedral

$$S{F_6}$$

$$B{F_4}^ -$$

$$PC{l_5}$$

$$BO_3^{3 - }$$

## Questions 29 of 50

Question:The structure and hybridisation of $$Si{(C{H_3})_4}$$ is

Bent, $$sp$$

Trigonal, $$s{p^2}$$

Octahedral, $$s{p^3}d$$

Tetrahedral, $$s{p^3}$$

## Questions 30 of 50

Question:Which of the following pairs has same structure

$$P{H_3}$$ and $$BC{l_3}$$

$$S{O_2}$$ and $$N{H_3}$$

$$PC{l_5}$$ and $$S{F_6}$$

$$NH_4^ +$$ and $$SO_4^{2 - }$$

## Questions 31 of 50

Question:The smallest bond angle is found in

$$I{F_7}$$

$$C{H_4}$$

$$Be{F_2}$$

$$B{F_3}$$

## Questions 32 of 50

Question:Which of the following bonds require the largest amount of bond energy to dissociate the atom concerned

$$H--H$$ bond in $${H_2}$$

$$C--C$$ bond in $$C{H_4}$$

$$N \equiv N$$ bond in $${N_2}$$

$$O = O$$ bond in $${O_2}$$

$$C--C$$ bond in ethane

## Questions 33 of 50

Question:The percentage s-character of the hybrid orbitals in methane, ethene and ethyne are respectively

25, 33, 50

25, 50, 75

50, 75, 100

10, 20, 40

## Questions 34 of 50

Question:$$s{p^3}$$ hybridisation is found in

$$CO_3^{2 - }$$

$$B{F_3}$$

$$NO_3^ -$$

$$N{H_3}$$

## Questions 35 of 50

Question:Which set hydridisation is correct for the following compounds

$$N{O_2}$$, $$S{F_4}$$ $$PF_6^ -$$

$$sp$$, $$s{p^2}$$, $$s{p^3}$$$$sp$$, $$s{p^3}d$$, $$s{p^3}{d^2}$$

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

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

## Questions 36 of 50

Question:The pair having similar geometry is

$$PC{l_3},\;N{H_3}$$

$$BeC{l_2},\;{H_2}O$$

$$C{H_4},CC{l_4}$$

$$I{F_5},\;P{F_5}$$

## Questions 37 of 50

Question:In compound $$X$$, all the bond angles are exactly $${109^o}28',\,\,X$$ is

Chloromethane

Iodoform

Carbon tetrachloride

Chloroform

## Questions 38 of 50

Question:$$BC{l_3}$$is a planar molecule while $$NC{l_3}$$ is pyramidal, because

$$BC{l_3}$$has no lone pair of electrons but $$NC{l_3}$$has a lone pair of electrons

$$B - Cl$$ bond is more polar than $$N - Cl$$ bond

Nitrogen atom is smaller than boron atom

$$N - Cl$$ bond is more covalent than $$B - Cl$$ bond

## Questions 39 of 50

Question:$${H_2}O$$is dipolar, whereas $$Be{F_2}$$is not. It is because

$${H_2}O$$is linear and $$Be{F_2}$$ is angular

$${H_2}O$$is angular and $$Be{F_2}$$ is linear

The electornegativity of F is greater than that of O

$${H_2}O$$involves hydrogen bonding whereas $$Be{F_2}$$is a discrete molecule

## Questions 40 of 50

Question:The bond order of a molecule is given by

The difference between the number of electrons in bonding and antibonding orbitals

Total number of electrons in bonding and antibonding orbitals

Twice the difference between the number of electrons in bonding and antibonding electrons

Half the difference between the number of electrons in bonding and antibonding electrons

## Questions 41 of 50

Question:The bond order of individual carbon-carbon bonds in benzene is

One

Two

Between 1 and 2

One and two alternately

## Questions 42 of 50

Question:Which of the following molecular orbitals has two nodal planes

$$\sigma \,2s$$

$$\pi \,2{p_y}$$

$${\pi ^*}\,2{p_y}$$

$${\sigma ^*}\,2{p_x}$$

## Questions 43 of 50

Question:Which of the following molecule has highest bond energy

$$F - F$$

$$C--C$$

$$N--N$$

$$O--O$$

## Questions 44 of 50

Question:The bond order in NO is 2.5 while that in $$N{O^ + }$$is 3. Which of the following statements is true for these two species

Bond length in $$N{O^ + }$$is equal to that in $$NO$$

Bond length in $$NO$$is greater than in $$N{O^ + }$$

Bond length in $$N{O^ + }$$is greater than in $$NO$$

Bond length is unpredictable

## Questions 45 of 50

Question:Which contains hydrogen bond

$$HF$$

$$HCl$$

$$HBr$$

$$HI$$

## Questions 46 of 50

Question:$$HCl$$ is a gas but $$HF$$is a low boiling liquid. This is because

$$H - F$$bond is strong

$$H - F$$bond is weak

Molecules aggregate because of hydrogen bonding

$$HF$$is a weak acid

## Questions 47 of 50

Question:Which of the following hydrogen bonds are strongest in vapour phase

$$HF - - - HF$$

$$HF - - - HCl$$

$$HCl - - - HCl$$

$$HF - - - HI$$

## Questions 48 of 50

Question:In the following metals which one has lowest probable interatomic forces

Copper

Silver

Zinc

Mercury

## Questions 49 of 50

Question:The formation of a chemical bond is accompanied by