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Aluminium compounds and alums

36 questions on Aluminium compounds and alums from the p-Block Elements: Groups 13 and 14 chapter: 7 NEET level, 15 JEE Main, 14 JEE Advanced. Each one opens with its answer and solution.

Practice this topic All p-Block Elements: Groups 13 and 14 topics

In the electrolytic extraction of aluminium from alumina, cryolite (Na3AlF6) is added mainly to NEET level
Potash alum has the formula K2SO4.Al2(SO4)3.xH2O. The value of x is NEET level
Aluminium oxide is described as amphoteric because it NEET level
Aluminium vessels can be used to transport concentrated nitric acid because JEE Main level
In the vapour phase aluminium chloride exists as Al2Cl6. The number of bridging chlorine atoms and the hybridisation of each Al are JEE Main level
Which of the following is NOT an alum? JEE Main level
In the Bayer process, carbon dioxide is passed through a solution of sodium aluminate to JEE Main level
Which statement about the forms of alumina is correct? JEE Main level
A little aqueous ammonia is added to a solution of potash alum, and then more ammonia is added in excess. What is observed? JEE Main level
A solution of AlCl3 in water turns blue litmus red mainly because JEE Main level
Select the correct statement(s). JEE Main level
5.4 g of aluminium is dissolved in excess hot aqueous NaOH, giving sodium tetrahydroxoaluminate. Taking Al=27 and molar volume 22.4 L/mol at STP, the volume of ... JEE Advanced level
A thermite mixture contains 13.5 g of Al powder and 64 g of Fe2O3, and reacts according to the equation 2Al + Fe2O3 -> Al2O3 + 2Fe. Taking Al=27, Fe=56, O=16, t... JEE Advanced level
47.4 g of potash alum, KAl(SO4)2.12H2O, is dissolved in water and dissociates completely into its constituent ions (ignore hydrolysis and treat water as the sol... JEE Advanced level
In the Hall-Heroult cell, a current of 100 A is passed for 9650 s with 100% current efficiency. Al is deposited at the cathode (Al^3+ + 3e- -> Al), and the grap... JEE Advanced level
Select the correct statement(s) about potash alum, KAl(SO4)2.12H2O. JEE Advanced level
Select the correct statement(s). JEE Advanced level
A 9.48 g sample of potash alum, KAl(SO4)2.12H2O, is heated strongly until all water and all sulfur trioxide have been expelled, leaving a residue of K2SO4 and A... JEE Advanced level
The formula of potash alum is NEET level
Al2O3 is NEET level
Alum is used for purification of water because it NEET level
The principal ore of aluminium is NEET level
Heating hydrated aluminium chloride, AlCl3.6H2O, does not give anhydrous AlCl3 because JEE Main level
An aqueous solution of AlCl3 is acidic because JEE Main level
Which of the following is an alum? JEE Main level
In the Hall-Heroult process, cryolite Na3AlF6 is added to JEE Main level
When aqueous AlCl3 is mixed with aqueous Na2CO3, the observation is JEE Main level
Select the correct statement(s) about alums. JEE Main level
Potash alum, KAl(SO4)2.12H2O (9.48 g), is strongly ignited until only Al2O3 remains as the solid residue (K, S and water are lost or taken as other products). U... JEE Main level
Consider the statements. I: AlCl3 exists as the bridged dimer Al2Cl6 in the vapour phase. II: In water it gives [Al(H2O)6]^3+ and Cl-. III: Anhydrous AlCl3 fume... JEE Advanced level
In Baeyer's process for purifying bauxite, which description is correct? JEE Advanced level
Assertion (A): Aluminium vessels can be used to transport conc. HNO3. Reason (R): Conc. HNO3 forms a thin, tough, protective oxide layer on the surface of alumi... JEE Advanced level
A salt solution gives a white gelatinous precipitate with aqueous ammonia that does not dissolve in excess; the precipitate dissolves in excess NaOH, and adding... JEE Advanced level
Select the correct statement(s) about the electrolytic extraction of aluminium. JEE Advanced level
Select the correct statement(s) about the reactions of aluminium. JEE Advanced level
Select the correct statement(s). JEE Advanced level