Which of the following species is not a pseudo halide ?

Which of the following is not a pseudo halide ion? 1) \(CNO^{-}\) 2) \(CN^{-}\) 3) \(SCN^{-}\) 4) \(S^{2-}\)

Which of the following is known as pseudo alum?

Which of the following halide is 2 ? .

Which of the following is pseudo alum ?

Which of the following is pseudo alum :

Which of the following reactions is pseudo first order reaction?