NEET Chemistry Chemical Bonding Molecular Structure,electro negativity

Chemical Bonding molecualr structure Mock Test-2

Question:-No: 1
Two general equations are given below.
(I) M(g)→ M+(g) + e
(II)X(g)+e→H(g)
Equations (i) and (ii) are termed respectively as

(a) ionisation enthalpy and electron gain enthalpy,
(b) electron gain enthalpy and ionisation enthalpy.
(c) electron gain enthalpy and electron gain enthalpy.
(d) ionisation enthalpy and ionisation enthalpy.




Question:-No:2
Which of the following statements is correct?

(a) The ionisation process may be exothermic or endothermic.
(b) The electron gain process may be exothermic or endothermic.
(c) The ionisation is always exothermic process.
(d) The electron gain process is always exothermic process.




Question:-No:3
tonic bonds will lie formed more easily

(a) between elements with comparatively low ionisation enthalpies and elements with comparatively high negative value of electron gain enthalpy.
(b) between elements with comparatively high ionisation enthalpies and elements with comparatively low negative value of electron gain enthalpy.
(c) between two elements which consist of low ionisation enthalpy and electron gain enthalpy.
(d) between two elements which consist of high ionisation enthalpy and electron gain enthalpy.




Question:-No:4
For general tonic compounds, choose the correct characteristics.

(a) Cations derived from metallic elements and an ions from non metallic elements.
(b) Anions derived from metallic elements and cat tons from non metallic elements.
(c) both cations and anions derived from non metallic elements.
(d) both cations and anions derived from metallic elements.




Question:-No:5
Rock salt is termed as

(a) MgCl2
(b) CaCl2
(c) NaCl
(d) Bel2




Question:-No:6
In ionic solids, the sum of the electron gain enthalpy and the ionisation enthalpy may be positive but still the crystal structure gets stabilized

(a) due to the energy released in the formation of the crystal lattice.
(b) due to the energy absorbed in the formation of the crystal lattice.
(c) due to bigger size of cations.
(d) due to smaller size of anions.




Question:-No:7
The lattice enthalpy of an ionic solid is defined as the energy required to completely separate

(a) one mole of a solid ionic compound into liquid constituent ions.
(b) one mole of a gaseous ionic compound into solid constituent ions.
(c) one mole of a solid ionic compound into gaseous constituent ions.
(d) one mole of a liquid ionic compound into solid constituent ions.




Question:-No:8
The lattice enthalpy of NaCl is 788 kJ mol -1. Which of the following statements satisfies the given characteristics?

(a) 788 kJ of energy is required to separate one mole of solid NaCl into one mole of Na + (g) and one mole of Cl (g) to a finite distance.
(b) 788 kJ of energy is required to separate one mole of solid NaCl into one mole of Na + (g) and one mole of Cl (g)to an infinite distance.
(c) 788 kJ of energy is required to separate one mole of gaseous NaCl into one mole of Na + (s) and one mole of Cl (s) to finite distance.
(d) 788 kJ of energy is required to separate one mole of gaseous NaCl into one mole of Na+ (s) and one mole of Cl (s) to an infinite distance.




Question:-No:9
Which of the following statement(s) regarding bond angle is/are correct?

(a) It gives some idea regarding the distribution of orbitals around the central atom in a molecule/complex ion.
(b) It helps us to determine the shape of the molecule/complex ion.
(c) both (a) and (b) are correct.
(d) None of these




Question:-No:10
What is the unit of bond enthalpy?

(a) kJ mol -1
(b) kJ mol -1k-1
(c) kJ bar-1mol-1k -1
(d) MJ mol-1




Question:-No:11
Which of the following will be the stronger bond in the molecule?

(a) HCl
(b) H2
(c) O2
(d) N2




Question:-No:12
Which of the following is the correct increasing order of bond dissociation enthalpy?

(a) H2 < HCl < O2 < N2
(b) HCl < H2 < O2 < N2
(c) N2 < O2 < H2 < HCl
(d) N2 < O2 < HCl < H2




Question:-No:13
In case of polyatomic molecules, like H2O. the enthalpy needed to break the two OH bonds is not the same.
H2O(g)→ H(g)+OH(g):Δa H1 = 502 kJ mol-1
OH(g) → H(g) + O(g); Δ a H2 = 427 kJ mol -1
What is the mean bond enthalpy of H2O molecule?

(a) 502 kJ mol -1
(b) 427 kJ mol -1
(c) 464.5 kJ mol -1
(d) 484.0 kJ mol -1




Question:-No:14
Which of the following pairs of species has identical bond order?

(a) N2and O2
(b) F2 and N2
((c) N2 and HCl
d) N2 and CO




Question:-No:15
Choose the correct correlation, for understanding the stabilities of molecules, with increase in bond order.

(a) bond enthalpy increases
(b) bond length decreases
(c) bond length increases
(d) both (a) and (b)




Question:-No:16
In PO43- ion. the formal charge on the oxygen atom of P- O bond is

(a) +1
(b) 1
(c) – 0.75
(d) +0.75




Question:-No:17
If the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p63d2 4s2, the four electrons involved in chemical bond formation will be

(a) 3p6
(b) 3p6, 4s2
(c) 3p6, 3d2
(d) 3d2, 4s2




Question:-No:18
Assertion: In molecule formation. Only the outer shell electrons take part in chemical combination and they are known as valence electrons.
Reason: By linking of chemical bonds, atom got stability.

(a) both A and R are true and R is the correct explanation of A.
(b) both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) both A and R are false




Question:-No:19
Assertion: Salt of sodium chloride is a stable tonic solid
Reason: Sodium chloride has high lattice enthalpy.

(a) both A and R are true and R is the correct explanation of A.
(b) both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) both A and R are tales