1 |
The bond angle H - O - H in ice ins closest to |
120<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">° , 28<sup>'</sup></span>
60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
109<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
|
2 |
Outer shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be |
XY
X<sub>2</sub>Y
X<sub>2</sub>Y<sub>3</sub>
XY<sub>2</sub>
|
3 |
Which of the following geometry is associated with the compound in which the central atom assumes sp3d hybridization? |
Planar
Pyramidal
Angular
Trigonal bipyramidal
|
4 |
Covalent compounds are soluble in |
Polar solvents
Non-polar solvents
Concentrated acids
All solvents
|
5 |
Among the alkaline earth metals the element forming predominantly covalent compounds is |
Be
Mg
Sr
calcium
|
6 |
Hydrogen chloride molecule contains |
Covalent bond
Double bond
Co-ordinate bond
Electrovalent bond
|
7 |
Water H2O is liquid while hydrogen sulphide H2S is a gas beause |
Water has higher molecular weight
Hydrogen sulphide is a weak acid
Sulphure has high electronegativity than oxyhe
Water molecules associate through hydrogen bonding
|
8 |
B-atom in BF3has |
sp<sup>3</sup>hybridization
sp<sup>2</sup>hybridization
sp hybridization
no hybridization
|
9 |
Which of the following molecules have its central atom sp2hybridized |
CH<sub>4</sub>
C<sub>2</sub>H<sub>2</sub>
C<sub>2</sub>H<sub>4</sub>
CCl<sub>4</sub>
|
10 |
Planar geometry of molecules is due to |
sp<sup>3</sup>hybridization
sp<sup>2</sup>hybridization
sp hybridization
P - p overlap
|
11 |
Nitrogen in NH3is sp3hybridized but the bond angle in NH3is 107° and not 109.5° due to |
sp<sup>3</sup>orbital planar
sp<sup>3</sup>orbital trigonal
Repulsion between lone pair and bonded pairs
None of them
|
12 |
The three N - Hσ-bonds are made by |
sp<sup>3</sup>- s overlap
sp<sup>2</sup>- s overlap
P - p overlap
sp - overlap
|
13 |
Three sp2hybrid are co-planar at an angle of |
104.5°
109.5°
107°
120°
|
14 |
During the formation of a chemical bond the potential energy of the system |
Decreases
Increases
Does not change
None of these
|
15 |
The geometry of 4 sp3hybrid orbitals on an atom is |
Square planar
Tetrahedral
Trigonal planar
Linear
|
16 |
Which of the following molecules have sp3hybridized carbon |
CH<sub>4</sub>
C<sub>2</sub>H<sub>4</sub>
C<sub>2</sub>H<sub>2</sub>
CO<sub>2</sub>
|
17 |
|
Excitantion of an electron from 2s to 2p-orbital
Transfer of three electrons from B to the other atoms
Excitation of two electrons form 2s orbital to 2p orbital
Formation of molecular ion
|
18 |
N-atom forms three covalent bonds, its electronic configuration is |
|
19 |
In which of the following theories the hybridizationis considered |
Vsepr
Lewis
Molecule orbital
Valence bond
|
20 |
In H2O molecule the bond angle is |
90°
109.5°
107°
104.5°
|
21 |
The overlapping of two partially filled atomic orbital is in such a way that the probability of finding the electron pair is maximum along the axis joining the two nuclei, the bond is |
Sigma bond
Pi bond
Ionic bond
Non-polar bond
|
22 |
One of the following bonds is polar but compound is non-polar |
H<sub>2</sub>O
NH<sub>3</sub>
HCl
CO<sub>2</sub>
|
23 |
The bond order for He2molecule is |
zero
1/2
1
2
|
24 |
Tripple bond is present in |
O<sub>2</sub>
H<sub>2</sub>
N<sub>2</sub>
Cl<sub>2</sub>
|
25 |
Coordinate covalent bond is present in the molecules |
H<sub>2</sub>O
BF<sub>3</sub>
SiO<sub>2</sub>
SO<sub>2</sub>
|
26 |
The bond order O2molecule is |
1
2
3
Zero
|
27 |
Which is made by coordinate covalent bond |
H<sub>3</sub>O<sup>+</sup>
H<sub>2</sub>O
CH<sub>4</sub>
HCl
|
28 |
Which of the following molecules have multiple bonds |
CH<sub>4</sub>
C<sub>2</sub>H<sub>4</sub>
C<sub>2</sub>H<sub>6</sub>
CCI<sub>4</sub>
|
29 |
Which of the following has polar bond |
O<sub>2</sub>
N<sub>2</sub>
HCl
Cl<sub>2</sub>
|
30 |
The number of electron pairs shared in carbon tetrachloride molecule is |
2
3
4
1
|