Which of the following sets consists of isoelectronic species?

1. CO, CN^–, NO⁺, C₂^2–

2. CO^–, CN, NO, C₂^–

3. CO⁺, CN⁺, NO^–, C₂

4. CO, CN, NO, C₂

Identify the correct increasing order of O–O bond length among the following species:

Which of the following molecules has trigonal planar geometry:

Which of the following would have a permanent dipole moment?

The correct sequence of increasing covalent character is represented by:

1. ${\mathrm{BeCl}}_2<\mathrm{NaCl}<\mathrm{LiCl}$

2. $\mathrm{NaCl}<\mathrm{LiCl}<{\mathrm{BeCl}}_2$

3. ${\mathrm{BeCl}}_2<\mathrm{LiCl}<\mathrm{NaCl}$

4. $\mathrm{LiCl}<\mathrm{NaCl}<{\mathrm{BeCl}}_2$

Which of the following is the electron deficient molecule:

1. C₂H₆ 

2. SiH₄

3. PH₃

4. B₂H₆ 

Which of the following species does not exhibit paramagnetism?

1. N₂⁺

2. O₂^–

3. CO

4. NO

In $P{O}_4^{-3}$, formal charge on every oxygen atom and P-O bond order respectively are:
1. –0.75 and 1.25
2. –0.5 and 2
3. 1 and 1.5
4. –0.75 and 2

Which of the following pairs contains species that are not isostructural?

1. ${\mathrm{IO}}_3^{-}\text{and\hspace{0.17em}}{\mathrm{XeO}}_3$

2. ${\mathrm{BH}}_4^{-}\text{and\hspace{0.17em}}{\mathrm{NH}}_4^{+}$

3. ${\mathrm{PF}}_6^{-}\text{and\hspace{0.17em}}{\mathrm{SF}}_6$

4. ${\mathrm{SiF}}_4\text{\hspace{0.17em}and\hspace{0.17em}}{\mathrm{SF}}_4$

Identify the correct increasing order of bond length among the following species: