Which of the following species can act as both a Brønsted-Lowry acid and a Lewis base?

2.5 g of impure $CaCO_3$ reacts completely with 100 mL of 0.2 M $HCl$ solution. What is the percentage purity of the $CaCO_3$ sample?

$CaCO_3(s) + 2HCl(aq) o CaCl_2(aq) + CO_2(g) + H_2O(l)$

Aprotic solvent is:

Which of the following is least likely to behave as Lewis acid?

The percentage of pyridine $({C_5}{H_5}N)$ that forms pyridinium ion $({C_5}{H_5}{N^ + }H)$ in a 0.10 M aqueous pyridine solution $({K_b}\,{\rm{for}}\,{C_5}{H_5}N = 1.7 imes {10^{ - 9}})$ is

Which statement is correct?

Identify the Lewis acid from the following:

The conjugate acid of ${\rm{HPO}}_4^{2 - }$ is:

Which of the following is not a Lewis base?

The conjugate base of ${{\rm{H}}_3}{\rm{B}}{{\rm{O}}_3}$ is:

Acidity of $B{F_3}$ can be explained on the basis of which of the following concept