Orbitals

Q. Which of the following molecules has the largest extent of back bonding?

1. $B{I}_3$
2. $BC{l}_3$
3. $BB{r}_3$
4. $B{F}_3$

Q. The impossible overlap among the following is:

1. 
2. 
3. 
4. 

Q. A p orbital can accommodate

1. $4$ electrons
2. $6$ electrons
3. $2$ electrons with parallel spins
4. $2$ electrons with opposite spins

Q. What is likely to be orbit number for a circular orbit of diameter $20$ nm of the hydrogen atom?

1. $10$
2. $14$
3. $12$
4. $16$

Q. The electrons are more likely to be found :

1. in the region a and b
2. in the region a and c
3. Only in the region c
4. Only in the region a

Q. Which of the following statements regarding an orbital are correct?

1. An orbital is the region around the nucleus where is 90 - 95% probability of finding an electron of an atom
2. An orbital is a definite trajectory around the nucleus in which electron can move
3. An orbital always has spherical trajectory
4. An orbital is characterized by 3 quantum numbers n, l and m

Q. Which among the following statements is/are correct for Hydrogen atom?

1. For all orbitals, the radial wave function $\left(\psi \right)$ approaches to zero as r approaches infinity
2. The radial probability density $\left({\psi }^2\right)$ for '1s' orbital is maximum at nucleus.
3. The radial distribution function $\left(4\pi x^2{\psi }^2\right)$ for '1s' is maximum at nucleus.
4. In plot of radial wave function $\left(\psi \right)$ changes its sign at nodes.

Q. List the main points of difference between an orbit and an orbital.

Q. What is the shape of f-orbital ?

1. spherical
2. dumb bell
3. double dumb bell
4. no definite shape

Q. There are total of ________ orbitals

1. 2
2. 4
3. 3
4. 5