Which of the following is Potash Alum?
- A$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
- B$K_2SO_4 \cdot Cr_2(SO_4)_3 \cdot 24H_2O$
- C$K_2SO_4 \cdot Fe_2(SO_4)_3 \cdot 24H_2O$
- D$(NH_4)_2SO_4 \cdot FeSO_4 \cdot 6H_2O$
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$(1)$ Among all alkali metals,.......... is a radioactive element.
$(2)$ The half-life of $^{223}Fr$ is ..........
$(3)$ Among all alkali metal ions,............ has the highest ionization enthalpy.
$(4)$ Alkali metals are identified by the ........... test.
$(1)$ Among all alkali metals,.......... is a radioactive element.
$(2)$ The half-life of $^{223}Fr$ is ..........
$(3)$ Among all alkali metal ions,............ has the highest ionization enthalpy.
$(4)$ Alkali metals are identified by the ........... test.
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