Molecular Orbitals of Carbon

Q. The bond order of $O_2^{+}$ is

1. $1$
2. $1.5$
3. $2.5$
4. $3$

Q.

The ratio between number of molecules in equal masses of CH₄ and SO₂ is?

Q. Which of the following species is paramagnetic?

1. $O_2^{-}$
2. $C{N}^{-}$
3. CO
4. $N{O}^{+}$

Q. Four one litre flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same room temperature and pressure. The ratio of total number of atoms of these gases present in different flasks would be

1. 1:1:1:1
2. 1:2:2:3
3. 2:1:2:3
4. 3:2:2:1

Q.

Nitrogen atom has ________ unpaired electrons, according to __________ rule.

Q.

The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B?

Q.

What are the electron configuration, orbital diagram, and noble gas notation of potassium?

Q. The difference between bond orders of $CO$ and $N{O}^{+}\text{is}\frac{x}{2}$where x is (Round off to the Nearest Integer)

Q.

The electronic configuration of bivalent Europium and trivalent Cerium, are: (Atomic Number : $\mathrm{Xe}=54,\mathrm{Ce}=58,\mathrm{Eu}=63$)

1. $\left[Xe\right]4f^7,\left[Xe\right]4f^1$

2. $\left[Xe\right]4f^{7}6s^2,\left[Xe\right]4f^{2}6s^2$

3. $\left[Xe\right]4f^2,\left[Xe\right]4f^7$

4. $\left[Xe\right]4f^4,\left[Xe\right]4f^9$

Q. According to molecular orbital theory which of the following is correct.

1. LUMO level of $C_2$ molecule is a $\sigma 2p_z$ orbital
2. All the above are correct
3. In $C_2^{2-}$ ion, there are one $\sigma$ and two $\pi$ bonds
4. In $C_2$ molecule, both the bonds are $\pi$ - bonds

Q. Which of the following species is paramagnetic?

1. $O_2^{-}$
2. $C{N}^{-}$
3. CO
4. $N{O}^{+}$

Q. to account for atomic mass of nitrogen as 14.0067 what should be the ratio of 15^N and 14^N atoms in natural nitrogen. (atomic mass of 14^N = 14.00307 u, 15^N=15.001 u) .

Q.

How to calculate number of atoms of copper present in 19.7g of 22carat gold?

Q.

what is the ratio of weight of O2 and He, the mixture of which contains equal number of molecules of equal gas?

Q. Assertion (A): $Cl{O}_2$ is a paramagnetic molecule.
Reason (R): $Cl$ atom in $Cl{O}_2$ molecule is $s{p}^3$ hybridised.

1. $A$and $R$ are true, R is correct explanation $ofA$.
2. $A$and $R$ are true, $R$ is not correct explanation of $A$.
3. $A$ is true, but $R$ is false.
4. $A$ is false, but $R$ is true.

Q. To account for atomic mass of nitrogen as 14.0067, what should be the ratio of 15N and 14N atoms in natural nitrogen? (atomic mass of 14N=14.00307u and 15N=15.001u)

Q.

What is Hunds rule of multiplicity?

Q.

In the given pairs which of the following pairs of molecules/ions, both the species does not likely to exist?

1. ${H_2}^{-},{H{e}_2}^{2-}$

2. ${H{e}_2}^{2-},H{e}_2$

3. ${H_2}^{-},{H{e}_2}^{2-}$

4. ${H_2}^{+},{H{e}_2}^{2-}$

Q. Ratio of heavy water to ordinary water

Q. Number of paramagnetic molecules from the following are:
$C{N}^{-},NO,O_2^{2-},O_2,N{O}_2,O_2{}^{-},B_2,C_2,F_2^{-}$

Q. According to molecular orbital theory which of the following is correct?

1. In $C_2^{2-}$ ion there is one $\sigma$ and two $\pi$ bonds
2. All the above are correct
3. LUMO level for $C_2$ molecule is ${\sigma }_{2p_z}$orbital
4. In $C_2$ molecules both the bonds are $\pi$ bonds

Q. Find the ratio of the total number of electron(s) in bonding molecular orbital of $O_2$ to the total number of electrons in bonding molecular orbital of $N_2$ molecule.

Q. In the DNA of E. Coli the mole ratio of adenine to cytosine is 0.7. If the number of moles of adenine in the DNA is 350000, the number of moles of guanine is equal to : (A) 350000 (B) 500000 (C) 225000 (D) 700000

Q.

The electronic configuration which corresponds to an alkali metal is

1. 2, 2

2. 2, 8, 2

3. 2, 8, 1

4. 2, 8, 8

Q. Electronegativity of F on Pauling scale is 4.0. Its value on Mulliken scale is__________.

1. 12.35
2. 15.2
3. 14.2
4. 11

Q. Assertion: $N_2$ and $N{O}^{+}$ are diamagnetic substances.
Reason: $N{O}^{+}$ is isoelectronic with $N_2.$

Q. $O_2,O_2^{-}$ and $O_2^{2-}$ are paramagnetic species.

1. True
2. False

Q. Which of the following species is diamagnetic?

1. $O_2^{-}$
2. $O_2^{+}$
3. $O_2$
4. $O_2^{2-}$

Q. The bond order of $H{e}_2^{+}$ molecule ion is

1. 
2. 
3. 
4. 

Q. In which of the following orbitals electron will be filled first?

1. $5f$
2. $6d$
3. $7s$
4. $7p$