In the reaction $NH_3 + BF_3 \rightleftharpoons NH_3 \to BF_3$,$BF_3$ is

Solid $CuSO_4 \cdot 5H_2O$ has covalent,ionic,as well as coordinate bonds. The copper atom/ion forms $.........$ coordinate bonds with water molecules.

The number of dative bonds in sulphuric acid $(H_2SO_4)$ molecules is:

Which of the following species contains a coordinate covalent bond?

In $BF_3$,the $B-F$ bond length is $1.3 \ \mathring{A}$. When $BF_3$ reacts with $Me_3N$,it forms an adduct $Me_3N \to BF_3$. In this adduct,the $B-F$ bond length will be ..........

Which of the following is a Lewis base?