s and p Overlap

Q. Which of the following will have the most negative electron gain enthalpy and which the least negative? $P,S,Cl,F.$ Explain your answer.

Q.

Which of the following pairs of elements belong to the same period of the periodic table?

1. C, Mg

2. N, Ar

3. Ca, Cl

4. K, Cu

Q.

Two $\pi$ bonds and half $\sigma$ bonds are present in:

1. ${\mathrm{N}}_2^{+}$

2. ${\mathrm{N}}_2$

3. ${\mathrm{O}}_2^{+}$

4. ${\mathrm{O}}_2$

Q. What is the type of hybridisation of each carbon in the following compound?
(a) $C{H}_{3}Cl$
(b) ${\left(C{H}_3\right)}_{2}CO$
(c) $C{H}_{3}CN$
(d) $HCON{H}_2$
(e) $C{H}_{3}CH=CHCN$

Q. What are the four bonds present in a DNA structure?

Q. Although \(Cr^{3+}\)and \(Co^{2+}\) ions have the same number of unpaired electrons, the magnetic moment of \(Cr^{2+}\) is 3.87 B.M. and that of \(Co^{2+}\)is 4.87 𝐵.𝑀. Why?

Q. what is bridge bond

Q.

Which bond is longer in general...single bond , double bond , triple bond.?

Q. The correct sequence of energy of orbitals of multielectron species is 4p<3d<4s 4s<4p<3d 4s<3d<4p 3d<4s<4p Why option 4 was not correct

Q. Write the state of hybridisation of carbon in the following compounds and shapes of each of the molecules.
(a) $H_{2}C=0$
(b) $C{H}_{3}F$
(c) $HC\equiv N$

Q.

Assertion (A) : Boron has a smaller first ionisation enthalpy than beryllium.

Reason $\left(R\right):$ The penetration of a $2s$ electron to the nucleus is more than the $2p$ electron hence $2p$ electron is more shielded by the inner core of electrons than the $2s$ electrons.

1. Assertion and reason both are wrong statements.

2. Assertion is a correct statement but reason is wrong.

3. Assertion and reason both are correct statements and reason is the correct explanation for assertion

4. Assertion and reason both are correct statements but reason is not correct explanation for assertion

Q. How to find bond length and bond angle?

Q. Assertion (A): The compound cycloocta $-1,3,5,7-$ tetraene has the following structural formula


It is cyclic and has conjugated $8\pi -$ electron system but it is not an aromatic compound.

Reason $\left(R\right):(4n+2)\pi -$ electron rule dose not hold good and the ring is not planar.

1. A is not correct but R is correct.
2. Both A and R are correct but R is not the correct explanation of A.
3. Both A and R are not correct.
4. Both A and R are correct and R is the correct explanation of A.

Q. Which of the following atomic orbital overlapping are not allowed?

1. All of these
2. (P) (Q) (R)
3. (P) (R) (T)
4. (Q) only

Q. What is the packing efficiency(formula)of a bcc lattice ?

Q. Match the compounds given in Column I with the hybridization and shape given in Column II and mark the correct option.

	Column I		Column I
a	$Xe{F}_6$	(i)	$S{p}^3{d}^3$ - distorted octahedral
b	$Xe{O}_3$	(ii)	$S{p}^3{d}^3$ - square planar
c	$XeO{F}_4$	(iii)	$S{p}^3{d}^3$ - pyramidal
d	$Xe{F}_4$	(iv)	$S{p}^3{d}^3$ - square pyramidal

1. $a\to \left(iv\right)b\to \left(i\right)c\to \left(ii\right)d\to \left(iii\right)$
2. $a\to \left(iv\right)b\to \left(iii\right)c\to \left(i\right)d\to \left(ii\right)$
3. $a\to \left(i\right)b\to \left(iii\right)c\to \left(iv\right)d\to \left(ii\right)$
4. $a\to \left(i\right)b\to \left(ii\right)c\to \left(iv\right)d\to \left(iii\right)$

Q.

Which of the polyhalide ions is not known?

1. 

2. 

3. 

4. 

Q. $A$:

Discuss the concept of hybridisation. What are its different types in a carbon atom.

$B$:

What is the type of hybridisation of carbon atoms marked with star.

A. B.C.D.E.

Q.

Write down the electronic configuration of the first three elements of group 1. How many valence electrons are present in each one of these elements?

Q. Explain why sigma bond is stronger than pi bond?

Q. Bond angle in SO2Cl2

Q.

White phosphorus $P_4$ has

1. Five P - P single bonds

2. Four P - P single bonds

3. Four lone pairs of electrons

4. PPP angle of 60⁰

Q.

The total number of radial nodes for a given orbital is _____

1. n - 1

2. n - l - 1

3. n + l + 1

4. n + 1

Q.

Question 35

Why does type of overlap given in the following figure not result in bond formation?

Q. The exhibition of various oxidation states by an element is also related to the outer orbital electronic configuration of its atom. Atom(s) having which of the following outermost electronic configurations will exhibit more than one oxidation state in its compounds.

1. $3s^{2}3p^3$
2. $3s^1$
3. $3d^{2}4s^2$
4. $3d^{1}4s^2$

Q. A $\sigma$ bond may be formed by the overlap of 2 atomic orbitals of atoms A and B. If the bond is formed along the x-axis, which of the following overlaps is acceptable?

1. $s$ orbital of A and $p_z$ orbital of B
2. $p_z$ orbital of A and $p_x$ orbital of B
3. $p_x$ orbital of A and $s$ orbital of B
4. $p_x$ orbital of A and $p_y$ orbital of B

Q. In $s{p}^3{d}^2$ hybridisation, which sets of $d$-orbitals is involved?

1. $d_{x^2-y^2},d_{z^2}$
2. $d_{xy}$, $d_{yz}$
3. $d_{x^2-y^2},d_{xy}$
4. $d_{z^2},d_{xy}$

Q. How to decide bond angle increasing order

Q. Which of the following statement is correct?

1. Leaving F-F bond, all halogens have weaker X-X bonds than X-X' bonds in interhalogens.
2. Among halogens, radius ratio between iodine and florine is maximum.
3. Interhalogen compounds are more reactive than halogen compounds.
4. Among interhalongen compounds maximum numbers of atoms are present in iodine fluoride.

Q. 38.How many π-bonds present in [Ni(CO)4]?