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11th Chemistry Weekly Test - 1 ( Chemical bonding )

MABS Institution

11th Chemistry Weekly Test - 1 ( Chemical bonding )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Which of the following molecules have bond order equal to I?

NO, HF, HCI, Li₂' CO
H₂, Li₂, HF, Br₂, HCI
Li₂, B₂, CO, NO, He₂⁺
B₂, CO, He₂⁺, NO, HF

Which one of the following has bond order as 2?

N₂
C₂H₄
CH₄
HCN

Which one of the following does not have trigonal planar shape?

O₃
\({ CO }_{ 3 }^{ 2- }\)
\({ NO }_{ 3 }^{ - }\)
BCl₃

On the basis of molecular orbital theory, select the most appropriate option.

The bond order of O₂ is 2.5 and it is paramagnetic
The bond order of O₂is 1.5 and it is paramagnetic
The bond order of O₂ is 2 and it is diamagnetic
The bond order of O₂ is 2 and it is paramagnetic

Identify the correct order regarding the electro negativity of hybrid orbitals of carbon is

sp < Sp² < Sp³
sp > sp² > sp³
sp > sp² > sp³
sp < sp² > sp³

The sharing of valence electrons between the atoms will lead to the formation of_____

Ionic bond
Covalent bond
Co-ordinate bond
Hydrogen bond

Which is the correct Lewis structure of Helium?

\(\\ \\ \\ \\ \\ \dot { H } e.\)
\(\ddot { H } e.\)
\(\overset { .. }{ \underset { .. }{ H } } e\)
\(\ddot { H } e\)

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

25, 25, 33, 3, 50
50, 50, 33, 3, 25
50, 25, 33, 3, 50
50, 25, 25, 50

In which of the following Compounds does the central atom obey the octet rule?

XeF₄
AlCl₃
SF₆
SCl₂

Pick out the molecule which possess diamagnetic behaviour.

O₂
\({ O }_{ 2 }^{ 2- }\)
\({ O }_{ 2 }^{ - }\)
\({ O }_{ 2 }^{ + }\)

Part - B

Generic 2 - Answer All Question

Define the following
i) Bond order
ii) Hybridisation
iii) σ- bond

What is Polar Covalent bond? explain with example.

Considering x- axis as molecular axis, which out of the following will form a sigma bond.
i) 1s and 2p_y
ii) 2P_x and 2P_x
iii) 2p_x and 2p_z
iv) 1s and 2p_z
Predict the geometry of BF₃, SF₆, SO₂ and NH₃

Explain the covalent character in ionic bond.

Part - C

Generic 3 - Answer All Question

Compare the bond angles of water and dimethyl ether and identify which one has the greater bond angle? Give appropriate reason for your answer

What are the main postulates of Valence Shell Electron Pair Repulsion (VSEPR) theory?

Draw the shape of
(i) XeF₂
(ii) IOF₅
(iil) XeOF₄
Explain about the molecular orbital diagram of hydrogen molecule.

Bond angle in PH⁺₄ is higher than in PH_3. Why?

Part - D

Generic 5 - Answer All Question

Write short note on the following bond parameter.
(i) Bond length
(ii) Bond order
(iii) Bond angle
(iv) Bond enthalpy

(i) What is an ionic bond?
(ii) Explain about the formation of ionic bond with a suitable example.

How are bonding and anti-bonding molecular orbitals formed? Represent the constructive and destructive interaction in the 1s orbitals.

What are hybridisation states of each carbon atom in the following compounds? CH₂=C=O, CH₃CH=CH₂, (CH₃)₂CO, CH₂=CHCN and HCONH₂
Define ionic bond. Give suitable examples and distinguish between covalent bond and ionic bond.

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