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NEET Chemistry MCQ
Boron Family Mcq Neet Chemistry
Quiz 3
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Q.1
Action of caustic soda on aluminium hydroxide gives a compound having formula --- {pb. PMT 1998]
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a) Al2(OH)4
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b) Na2Al(OH)4
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c) NaAlO2
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d) NaAlO3
Explanation
Answer: (c)
Q.2
Aluminium reacts with dilute HCl and conce. NaOH solution to liberate the gases respectively
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a) H2 and O2
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b) O2 and H2
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c) H2 and H2
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d) O2 and O2
Explanation
2Al + 6HCl (dil.) → 2AlCl3 + 3H2 2Al + 2NaOh + 6H2O → 2Na[ Al(OH)4) + 3H2 Answer: (c)
Q.3
'Anodized aluminium' is aluminium
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a) Obtained on anode
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b) Electrolytically coated with aluminium oxide
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c) Is an alloy of aluminium
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d) Non of above
Explanation
Answer:(b)
Q.4
The chief impurity present in red bauxite is .. [ DEC2004]
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a) K2SO4
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b) FeO3
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c) SiO3
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d) NaF
Explanation
Answer: (b)
Q.5
Aluminium (III) chloride forms a dimer because? [ CBSE PMT 1995]
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a) Higher coordination number can be archived by aluminium
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b) Aluminium has high ionization energy
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c) Alumium belong to 3rd group
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d) It cannot form a trimer
Explanation
By forming a dimer A2Cl6 aluminium achieves a coordination number of 4 Answer: (a)
Q.6
Aluminium chloride is a /an .. [ KCET 2000]
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a) Bronsted -Lowry acid
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b) Arrhenius acid
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c) Lewis acid
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d) Lewis base
Explanation
Al in AlCl3 is electron deficient. Hence acts as Lewis acid Answer: (c)
Q.7
Alum helps in purifying water by [ AIEEE 2002]
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a) Forming Si complex with clay particles
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b) Sulphate part which combines with the dirt and remove it
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c) Aluminium which coagulates the mud particles
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d) Making mud water soluble
Explanation
Answer:(c)
Q.8
On addition of mineral acid to an aqueous solution of borax, the following compound is formed.. [ Roorkee Screening test 1992]
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a) Boron hydride
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b) Orthoboric acid
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c) Meta boric acid
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d) Pyroboric acid
Explanation
Na2B4O7 + 2HCl +5H2O → 2NaCl + 4H3BO3 ( orthoboric acid) Answer: (b)
Q.9
Corundum is .. [CPMT 1998]
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a) Al2(SO4)3
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b) Al2 O3 . H2O
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c) Al2 O3 . 2H2O
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d) Al2 O3
Explanation
Answer: (d)
Q.10
In the case of small cuts, bleeding is stopped by applying potash alum. Here alum acts as .. [ KCET 2001]
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a) Germicide
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b) Disinfectant
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c) Fungicide
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d) Coagulating agent
Explanation
Answer: (d)
Q.11
In alluminate coordination number of Al is
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d) 1
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a) 4
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b) 6
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c) 3
Explanation
In aqueous solution aluminate species forms complex ion [Al(H2O)2(OH)4]-. where Coordination number of ALi is 6 Answer:(b)
Q.12
Which is the strongest Lewis acid [ DEC 2006]
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a) BF3
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b) BCl3
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c) BBr3
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d) BI3
Explanation
Lewis acid strength is BI3 > BBr3 > BCl3 > BF3 Answer: (d)
Q.13
Which of the following properties of aluminium makes it useful for food packing [ AMU 1997]
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a) Good thermal conductivity
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b) Good electrical conductivity
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c) Low density
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d) Non-toxicity
Explanation
Answer: (d)
Q.14
Electrolytic reduction of alumina to aluminium by Hall - Heroult process is carried ... [ iit SCREENING TEST2000]
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a) In the presence of NaCl
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b) In the presence of fluorite
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c) In the presence of cryolite which forms a melt with lower melting temperature
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d) In the presence of cryolit which forms a melt with higher melting temperature
Explanation
Answer: (c)
Q.15
Which one is a non-metal in group 13(IIIA) .. [ AFMC 2003]
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a) B
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b) Al
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c) Ga
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d) In
Explanation
Boron is the first member of the group 13 element it is non-metal Answer:(a)
Q.16
H3BO3 is .. [ IIT 2003]
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a) Monobasic and weak Lewis acid
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b) Monobasic and weak Bronsted acid
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c) Monobasic and strong Lewis acid
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d) Tribasic and weak Bronsted acid
Explanation
Boric acid (H3BO3) behaves as a Lewis acid and accepts OH- ions from water.It does not dissociate to produce H3O+ ions rather forms metaborate ion and in turn release H3O+ ions. B(OH)3 + H2O → [B(OH)4]- + H3O+ Hence boric acid is considered a monobaic and weak Lewis acid Answer: (a)
Q.17
Which is not a mineral of aluminium? { KCET 1998]
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a) Anhydrite
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b) Bauxite
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c) Corundum
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d) Diaspore
Explanation
Anhydrite is anhydrous CaSO4 Answer: (a)
Q.18
Which of the following is known as pseudo alum? [ Manipal PMT 2001]
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a) KMn(SO4)2 . 12H2O
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b) KCr(SO4)2 . 12H2O
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c) NH4Fe(SO4)2 . 12H2
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d) FeSO4 Al2(SO3)3 . 24H2O
Explanation
A pseudo alum is a double sulfate of the typical formula ASO4路B2(SO4)3路24H2O, where A is a divalent metal ion, such as cobalt , manganese , magnesium or iron , and B is a trivalent metal ion. i.e. class of alums in which the usual monovalent metal of a true alum is replaced by a bivalent metal Answer: (d)
Q.19
The dissolution of Al(OH)3 in solution of NaOH results in the fomation of ..
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a) [Al(H2O)4(OH)2]+
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b) [Al(H2O)4(OH)2]-
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c) [Al(H2O)4(OH)4]+
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d) [Al(H2O)4(OH)4]-
Explanation
Answer:(d)
Q.20
Borax is prepared by treating colemanite with [ DEC 2007]
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a) NaNO3
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b) NaCl
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c) Na2CO3
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d) NaHCO3
Explanation
Ca32B6O11 + 2Na2CO3 → 2CaCO3 + 2NaBO2 + Na2B4O7 ( Borax) Answer: (c)
Q.21
Hydrogen gas is liberated by the action of aluminium with concentrated solution of ... [ IIT 1987]
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a) H2SO4
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b) HCl
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c) HF
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d) HNO3
Explanation
Answer: (c)
Q.22
Which of the following statements about anhydrous aluminum chloride is correct? [ IIT 1981]
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a) It exist as AlCl3 molecule
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b) It is not easily hydrolyzed
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c) It sublimes at 100°C under vacuum
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d) It is a strong Lewis base
Explanation
AlCl3 exists as dimer, strong lewis acids and gets hydrolyses easily Answer: (c)
Q.23
Which of the following is not protonic acid
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a) SO(OH)2
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b) PO(OH)
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c) Al(OH)3
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d) B(OH)3
Explanation
An acid that forms positive hydrogen ions in aqueous solution. The term is used to distinguish ‘traditional’ acids from Lewis acids or from Lowry-Bronsted acids in nonaqueous solvents. B(OH)3 + H2O → B(OH)4 - + H+ Answer:(d)
Q.24
AlCl3 fumes in moist air because
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a) It sublimate
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b) It gives out HCl gas
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c) It is highly hygroscopic
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d) It is ionic
Explanation
In moist air AlCl3 get hydrolyzed and produce HCl which fumes in moist air AlCl3 + 3H2O → Al(OH)3 + OH Answer: (b)
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
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a) Addition of borax
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b) addition of cis-1-2-diol
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c) Na2HPO4
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d) addition of trans -1-2-diol
Explanation
cis 1-2-diol forms chilated complex ion with product [B(OH)4]- cause reaction to proceed in forward direction Answer: (b)
Q.26
Solubility of hydrous AlCl3 and unhydrous AlCl3 in diethyl ether be S1 and S2 then
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a) S1 > S2
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b) S 1 < S2
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c) S 1 = S2
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d) both are insoluble in diethyl ether
Explanation
Al in un hydrous AlCl3 is deficient in electrons thus get attracted to pi bonds of Diethyl eather. and become soluble while Al in hydrous AlCl3 Al share electrons from Water molecules hence have less affiliation for diethyl eather Answer: (b)
Q.27
The pair of amphoteric hydroxide is
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a) Al(OH)3 and LiOH
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b) Al(OH)3 and Be(OH)2
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c) Be(OH)2 and Zn(OH)2
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d) Mg(OH)2 and Zn(OH)2
Explanation
Al and Be shows similarities in their properties due to diagonal relationship Answer:(b)
Q.28
In which of the following elements +1 oxidation stable is more stable than +3
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a) B
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b) Al
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c) In
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d) Ti
Explanation
Down the group oxidation state +1 becomes more stable Answer: (d)
Q.29
Which of the following methods are used for purification of bauxite containing iron oxide as impurity
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a) Serpeck's method
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b) Electrolytic refining
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c) Baeyer's process
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d) Hoope's process
Explanation
Answer: (c)
Q.30
Which of the following wrong regarding the structure of diborane
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a) Four terminal hydrogen atoms and two bridged hydrogen atoms
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b) The terminal hydrogen atoms and boron atoms lie in a plane
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c) Four two centre bonds two three centre bonds
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d) B is sp2 hybridized
Explanation
B is sp3 hybridized Answer: (d)
0 h : 0 m : 1 s
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