Q.1
Action of caustic soda on aluminium hydroxide gives a compound having formula --- {pb. PMT 1998]
  • a) Al2(OH)4
  • b) Na2Al(OH)4
  • c) NaAlO2
  • d) NaAlO3
Q.2
Aluminium reacts with dilute HCl and conce. NaOH solution to liberate the gases respectively
  • a) H2 and O2
  • b) O2 and H2
  • c) H2 and H2
  • d) O2 and O2
Q.3
'Anodized aluminium' is aluminium
  • a) Obtained on anode
  • b) Electrolytically coated with aluminium oxide
  • c) Is an alloy of aluminium
  • d) Non of above
Q.4
The chief impurity present in red bauxite is .. [ DEC2004]
  • a) K2SO4
  • b) FeO3
  • c) SiO3
  • d) NaF
Q.5
Aluminium (III) chloride forms a dimer because? [ CBSE PMT 1995]
  • a) Higher coordination number can be archived by aluminium
  • b) Aluminium has high ionization energy
  • c) Alumium belong to 3rd group
  • d) It cannot form a trimer
Q.6
Aluminium chloride is a /an .. [ KCET 2000]
  • a) Bronsted -Lowry acid
  • b) Arrhenius acid
  • c) Lewis acid
  • d) Lewis base
Q.7
Alum helps in purifying water by [ AIEEE 2002]
  • a) Forming Si complex with clay particles
  • b) Sulphate part which combines with the dirt and remove it
  • c) Aluminium which coagulates the mud particles
  • d) Making mud water soluble
Q.8
On addition of mineral acid to an aqueous solution of borax, the following compound is formed.. [ Roorkee Screening test 1992]
  • a) Boron hydride
  • b) Orthoboric acid
  • c) Meta boric acid
  • d) Pyroboric acid
Q.9
Corundum is .. [CPMT 1998]
  • a) Al2(SO4)3
  • b) Al2 O3 . H2O
  • c) Al2 O3 . 2H2O
  • d) Al2 O3
Q.10
In the case of small cuts, bleeding is stopped by applying potash alum. Here alum acts as .. [ KCET 2001]
  • a) Germicide
  • b) Disinfectant
  • c) Fungicide
  • d) Coagulating agent
Q.11
In alluminate coordination number of Al is
  • d) 1
  • a) 4
  • b) 6
  • c) 3
Q.12
Which is the strongest Lewis acid [ DEC 2006]
  • a) BF3
  • b) BCl3
  • c) BBr3
  • d) BI3
Q.13
Which of the following properties of aluminium makes it useful for food packing [ AMU 1997]
  • a) Good thermal conductivity
  • b) Good electrical conductivity
  • c) Low density
  • d) Non-toxicity
Q.14
Electrolytic reduction of alumina to aluminium by Hall - Heroult process is carried ... [ iit SCREENING TEST2000]
  • a) In the presence of NaCl
  • b) In the presence of fluorite
  • c) In the presence of cryolite which forms a melt with lower melting temperature
  • d) In the presence of cryolit which forms a melt with higher melting temperature
Q.15
Which one is a non-metal in group 13(IIIA) .. [ AFMC 2003]
  • a) B
  • b) Al
  • c) Ga
  • d) In
Q.16
H3BO3 is .. [ IIT 2003]
  • a) Monobasic and weak Lewis acid
  • b) Monobasic and weak Bronsted acid
  • c) Monobasic and strong Lewis acid
  • d) Tribasic and weak Bronsted acid
Q.17
Which is not a mineral of aluminium? { KCET 1998]
  • a) Anhydrite
  • b) Bauxite
  • c) Corundum
  • d) Diaspore
Q.18
Which of the following is known as pseudo alum? [ Manipal PMT 2001]
  • a) KMn(SO4)2 . 12H2O
  • b) KCr(SO4)2 . 12H2O
  • c) NH4Fe(SO4)2 . 12H2
  • d) FeSO4 Al2(SO3)3 . 24H2O
Q.19
The dissolution of Al(OH)3 in solution of NaOH results in the fomation of ..
  • a) [Al(H2O)4(OH)2]+
  • b) [Al(H2O)4(OH)2]-
  • c) [Al(H2O)4(OH)4]+
  • d) [Al(H2O)4(OH)4]-
Q.20
Borax is prepared by treating colemanite with [ DEC 2007]
  • a) NaNO3
  • b) NaCl
  • c) Na2CO3
  • d) NaHCO3
Q.21
Hydrogen gas is liberated by the action of aluminium with concentrated solution of ... [ IIT 1987]
  • a) H2SO4
  • b) HCl
  • c) HF
  • d) HNO3
Q.22
Which of the following statements about anhydrous aluminum chloride is correct? [ IIT 1981]
  • a) It exist as AlCl3 molecule
  • b) It is not easily hydrolyzed
  • c) It sublimes at 100°C under vacuum
  • d) It is a strong Lewis base
Q.23
Which of the following is not protonic acid
  • a) SO(OH)2
  • b) PO(OH)
  • c) Al(OH)3
  • d) B(OH)3
Q.24
AlCl3 fumes in moist air because
  • a) It sublimate
  • b) It gives out HCl gas
  • c) It is highly hygroscopic
  • d) It is ionic
Q.25
How can the following reaction be made to proceed in forward direction? [ IIT 2006] B(OH)3 + NaOH ↔ NaBO2 + Na[B(OH)4] + H2O
  • a) Addition of borax
  • b) addition of cis-1-2-diol
  • c) Na2HPO4
  • d) addition of trans -1-2-diol
Q.26
Solubility of hydrous AlCl3 and unhydrous AlCl3 in diethyl ether be S1 and S2 then
  • a) S1 > S2
  • b) S 1 < S2
  • c) S 1 = S2
  • d) both are insoluble in diethyl ether
Q.27
The pair of amphoteric hydroxide is
  • a) Al(OH)3 and LiOH
  • b) Al(OH)3 and Be(OH)2
  • c) Be(OH)2 and Zn(OH)2
  • d) Mg(OH)2 and Zn(OH)2
Q.28
In which of the following elements +1 oxidation stable is more stable than +3
  • a) B
  • b) Al
  • c) In
  • d) Ti
Q.29
Which of the following methods are used for purification of bauxite containing iron oxide as impurity
  • a) Serpeck's method
  • b) Electrolytic refining
  • c) Baeyer's process
  • d) Hoope's process
Q.30
Which of the following wrong regarding the structure of diborane
  • a) Four terminal hydrogen atoms and two bridged hydrogen atoms
  • b) The terminal hydrogen atoms and boron atoms lie in a plane
  • c) Four two centre bonds two three centre bonds
  • d) B is sp2 hybridized
0 h : 0 m : 1 s