What is the chemical formula of Potash alum?

Q. Determine the mass in grams of $1$ mole of $KAl(S{O}_4{)}_2\cdot 12H_{2}O$?

Q. If the empirical formula of potash alum is $KAl(S{O}_4{)}_x,12H_{2}O$, then the value of 'x' in $KAl(S{O}_4{)}_x,12H_{2}O$ is:

Q. Find the amount of alum $KAl(S{O}_4{)}_2\cdot 12H_{2}O$ separated out from 320 g $KAl(S{O}_4{)}_2$ solution saturated at 20°C, if 160 g of water is evaporated from the solution at 20°C. Given that the solution saturated at 20°C contains 5.5% of $KAl(S{O}_4{)}_2$ by mass. (Use molar mass : K = 39, Al = 27, S = 32)
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Q. Potassium alum, $KAl(S{O}_4{)}_2\cdot 12H_{2}O$ is obtained in the form of octahedral crystals when a solution of $K_{2}S{O}_4$ and $A{l}_2(S{O}_4{)}_3$ is concentrated by evaporation. Suggest specific experiments to specify whether it is a complex or double salt.

Q.

Assign oxidation numbers to the underlined elements in each of the following species:

(a) NaH₂PO₄ (b) NaHSO₄ (c) H₄P₂O₇ (d) K₂MnO₄

(e) CaO₂ (f) NaBH₄ (g) H₂S₂O₇ (h) KAl(SO₄)₂.12 H₂O