160 + Interview Questions in THE-BORON-FAMILY IN GENERAL AWARENESS Page 2 InterviewSolution

51.	An example of alum isA. `Al_(2)(SO_(4))_(3).Na_(2)SO_(4).12H_(2)O`B. `FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)O`C. `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`D. `FeSO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`
Answer» Correct Answer - C `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` is potash alum.

Discussion

52.	Aluminium becomes passive inA. Conc. `HNO_(3)`B. `H_(2)CrO_(4)`C. `HClO_(4)`D. All
Answer» Correct Answer - D Aluminium becomes passive in strongly oxidising medium. Conc. `HNO_(3), H_(2)CrO_(4), HClO_(4)` are all oxidising agents. As such Al becomes passive in all the three.

Discussion

53.	Alum is not usedA. as a mordant in dyeingB. as an insecticideC. in purification of waterD. in tanning of leather.
Answer» Correct Answer - B Alum is used as a mordant in dyeing, for purification of water and for tanning of lather. Alum is not used as an insecticide.

Discussion

54.	Which one of the following metal cannot be extracted by using Al as a reducing agent ?A. Na from `Na_(2)O`B. `Cr` from `Cr_(2)O_(3)`C. `Mn` from `Mn_(3)O_(4)`D. W from `WO_(3)`
Answer» Correct Answer - A Because Na is more electropositive than Aluminium.

Discussion

55.	A lake can be obtained by making a mixture of a coloured dye withA. `NH_(4)OH`B. `Ba(OH)_(2)`C. `Al(OH)_(3)`D. `NaOH`
Answer» Correct Answer - C `Al(OH)_(3)` due to absorption of colour by the precipitates of `Al(OH)_(3)` [Lake test]

Discussion

56.	Boric acid is polymeric due toA. its acidic natureB. the presence of hydrogen bondsC. its monobasic natureD. its geometry
Answer» Correct Answer - B Boric acid consists of `BO_(3)` units which are hydrogen bonded.

Discussion

57.	Which of the following does not form `M^(3+)` ion?A. BoronB. AluminiumC. IndiumD. Gallium
Answer» Correct Answer - A Boron does not form `B^(3+)` ion due to its small size and high ionization energy.

Discussion

58.	Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides ?A. `MgO lt K_(2)O lt Al_(2)O_(3) lt Na_(2)O`B. `Na_(2)O lt K_(2)O lt MgO lt Al_(2)O_(3)`C. `K_(2)O lt Na_(2)O lt Al_(2)O_(3) lt MgO`D. `Al_(2)O_(3) lt MgO lt Na_(2)O lt K_(2)O`
Answer» Correct Answer - B Correct order of basic strength `Al_(2)O_(3) lt MgO lt Na_(2)O lt K_(2)O` Group 1 oxides are more basic than group 2 oxides. Basic character of oxides increases down the group.

Discussion

59.	`AlCl_(3)` is hydroscopic in nature. It meansA. `AlCl_(3)` undergoes air oxidationB. `AlCl_(3)` is a strong oxidising agentC. `AlCl_(3)` absorbs moisture and becomes liquidD. `AlCl_(3)` absorbs moisture when exposed to air
Answer» Correct Answer - D `AlCl_(3)` absorbs moisture and dissolves in it.

Discussion

60.	Aluminium salt commonly used to stop bleeding isA. Aluminium sulphateB. Potash alumC. Aluminium chlorideD. Aluminium fluoride
Answer» Correct Answer - B Potash alum (phitkari) is used as stypic to stop bleeding. `Al^(+3)` ions from alum neutralises the negatively charged colloidal particles of blood and then they coagulate to form a clot.

Discussion

61.	Which of the following property does not support anomalous behaviour of boron?A. Small sizeB. High electronegativityC. High ionization energyD. Formation of trihalides
Answer» Correct Answer - D All the members of the boron family form trihalides.

Discussion

62.	The aluminium salt commonly used to stop bleeding isA. Aluminium sulphateB. Potash alumC. Al,uminium chlorideD. Aluminium fluoride
Answer» Correct Answer - B Potash alum `K_(2)SO_(4).Al(SO_(4))_(3).24H_(2)O` give `Al^(3+)` ions easily which neutralise the negatively charged albuminoid substance of blood which then coagulate to form clot.

Discussion

63.	The nature of the solution of Potash alum isA. BasicB. AcidicC. NeutralD. Amphoteric
Answer» Correct Answer - B Due to cationic hydrolysis

Discussion

64.	Which of the following is not a protonic acid ?A. `SO_(2)(OH)_(2)`B. `B(OH)_(3)`C. `PO(OH)_(3)`D. `SO(OH)_(2)`
Answer» Correct Answer - B `B(OH)_(3)` is not a protonic acid.

Discussion

65.	Aluminium reacts with caustic soda to formA. Aluminium hydroxideB. Aluminium oxideC. Sodium meta-aluminateD. Sodium tetra aluminate
Answer» Correct Answer - C `2Al+underset("Caustic soda")(2NaOH)+2H_(2)O rarr underset("Sod. Metaaluminate")(2NaAlO_(2))+3H_(2)`

Discussion

66.	Which of the following is a correct statement ?A. The hydroxide of aluminium is more acidic than that of boronB. The hydroxide of boron is basic, while that of aluminium is amphotericC. The hydroxide of boron is acidic, while that of aluminium is amphotericD. The hydrolysis of aluminium and boron are amphoteric.
Answer» Correct Answer - C The hydroxide of boron is acidic while that of the aluminium is amphoteric.

Discussion

67.	Aluminium reacts with concentrated HCl and concentrated NaOH to liberate the gases.........respectively.A. `H_(2)` and `O_(2)`B. `O_(2)` and `H_(2)`C. `H_(2)` and `H_(2)`D. `O_(2)` and `O_(2)`
Answer» Correct Answer - C `2Al+6HCl rarr 2AlCl_(3) +3H_(2)` `2Al + 2NaOH + 2H_(2)O rarr 2NaAlO_(2)+3H_(2)`

Discussion

68.	Alum helps in purification water byA. forming Si complex with clay particlesB. sulphate part which combines with dirt and removes it.C. aluminium which coagulates the mud particlesD. making mud water soluble
Answer» Correct Answer - C Alum helps in purifying water by coagulating the negatively charged mud particles with `Al^(3+)` ions provided by it

Discussion

69.	The amphoteric oxide from among the following isA. `B_(2)O_(3)`B. `In_(2)O_(3)`C. `Ga_(2)O_(3)`D. `Tl_(2)O_(3)`
Answer» Correct Answer - D

Discussion

70.	Which one of the following is a correct statement ?A. Al is more acidic than that of BB. B is basic while that of Al is amphotericC. B is acidic while that of Al is amphotericD. B and Al are amphoteric
Answer» Correct Answer - C Oxide of boron is acidic while oxide of aluminium is amphoteric.

Discussion

71.	which of the following oxide is amphoteric ?A. `Na_(2)O`B. `MgO`C. `Al_(2)O_(3)`D. `CaO`
Answer» Correct Answer - C Out of the given four oxides, `Al_(2)O_(3)` is most amphoteric.

Discussion

72.	The apir of amphoteric hydroxide isA. `Al(OH)_(3), LiOH`B. `Be(OH)_(2), Mg(OH)_(2)`C. `Al(OH)_(3), Be(OH)_(2)`D. `Ni(OH)_(2), Zn(OH)_(2)`
Answer» Correct Answer - C Both `Al(OH)_(3)` and `Be(OH)_(2)` are amphoteric.

Discussion

73.	Duralumina is an alloy ofA. Al and MgB. al, Mg and NiC. Al, Mg, Mn, CuD. Al and Ni
Answer» Correct Answer - C Duralumin is an alloy of Al, Mg, Mn and cu.

Discussion

74.	`B(OH)_(3)` isA. BasicB. MonobasicC. DibasicD. Tribasic
Answer» Correct Answer - B Monobasic acid `B(OH)_(3)+OH^(-) rarr [B(OH)_(4)]^(-)`

Discussion

75.	Among the halides of the elements of group 13 the one which is most acidic isA. `BF_(3)`B. `AlCl_(3)`C. `BCl_(3)`D. `B Br_(3)`
Answer» Correct Answer - D `B BF_(3)` can accept the electrons most readily because it is much more electron deficient than `BF_(3)`. The decreasing order of activity is `B Br_(3) gt BCl_(3) gt BF_(3)`.

Discussion

76.	Assertion (A) : `B(OH)_(3)` is weakly basic. Reason (R) : B-O bonds can be broken easily.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. Both A and R are false.
Answer» Correct Answer - D `B(OH)_(3)` is a weak acid and when dissolved in water `B-O` bonds do not break.

Discussion

77.	Which of the following hydroxide is acidic?A. `Al(OH)_(3)`B. `Ga(OH)_(3)`C. `Tl(OH)_(3)`D. `B(OH)_(3)`
Answer» Correct Answer - D `B(OH)_(3)` ortho Boric acid is acid because it can take `OH^(-)` ions `H_(3)BO_(3)` or `B(OH)_(3)+OH^(-) rarr B(OH)_(4)^(-)`

Discussion

78.	Which of the following is electron-deficient ?A. `PH_(3)`B. `(CH_(3))_(2)`C. `(SiH_(3))_(2)`D. `(BH_(3))_(2)`
Answer» Correct Answer - D Diborane `B_(2)H_(6)` of `(BH_(3))_(2)` is electron deficient. It has two 3c-3e bonds.

Discussion

79.	Assertion (A) : `B(OH)_(3)` is acidic while `In(OH)_(3)` is basic. Reason (R) : `B(OH)_(3)` has highly H-bonded net-work structure.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true
Answer» Correct Answer - C Reason. `H_(3)BO_(3)` (or `B(OH)_(3)`) is an acid because B is a typical non-metal while `In(OH)_(3)` is a base because it is a typical metal.

Discussion

80.	Which of the following is an electron deficient compound?A. `MgCl_(2)`B. `BCl_(3)`C. `GeCl_(3)`D. `C Cl_(4)`
Answer» Correct Answer - B `BCl_(3)` because it has only sextet of electrons around central atom boron.

Discussion

81.	The species which can best serve as an initiater for the cationic polymerisation isA. `LiAlH_(4)`B. `HNO_(3)`C. `AlCl_(3)`D. `BaLi`
Answer» Correct Answer - C Electrons deficient species (Lewis acid) like `AlCl_(3)` is used as an initiator for cationic polymerisation.

Discussion

82.	Thallium shows different oxidation states due to :A. of its high reactivityB. of inert pair of electronC. of its amphoteric natureD. it is a transition metal
Answer» Correct Answer - B Thallium shows different oxidation states (+1 and +3) due to inert pair effect.

Discussion

83.	In which of the following elements +1 oxidation state is more stable than +3A. BB. AlC. GaD. Tl
Answer» Correct Answer - D In case of thallium +1 oxidation state is more stable than +3. It is due to inert pair effect.

Discussion

84.	Assertion (A) : Al forms `[AlF_(6)]^(3-)` ions but B does not form `[BF_(6)]^(3-)` ions. Reason (R) : B does not react with `F_(2)`.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true
Answer» Correct Answer - C Reason. Due to non-availability of d-subshell in the valence shell of B, it cannot expand its octet.

Discussion

85.	`TlI_(3)` is a black coloured sparingly soluble ionic compound. In its aqueous solution, it will giveA. `Tl^(+)` gives `I_(3)^(-)` ionsB. `Tl^(3+)` and `I^(-)` ionsC. `Tl^(+), I^(-)` ions and `I_(2)`D. `Tl^(+)` and `I^(-)` ions
Answer» Correct Answer - A `TlI_(2)` is analogous to potassium tri-iodide. It is not thallic iodide ot thallium (III) iodide. It contains `K^(+)` and tri-iodide ion `I_(3)^(-)`.

Discussion

86.	Assertion (A) : `H_(3)BO_(3)` is a tribasic weak acid. Reason (R) : B is a typical non-metal.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. Both A and R are false.
Answer» Correct Answer - D `H_(3)BO_(3)` is a weak monobasic acid. `B(OH)_(3)+H_(2)O hArr [B(OH)_(4)]^(-)+H^(+)`

Discussion

87.	Melting point is highest forA. BB. AlC. GaD. In
Answer» Correct Answer - A

Discussion

88.	The melting pt. of Group 13 follows the orderA. `B gt Al gt Ga gt In gt Tl`B. `B gt Al lt Ga gt In gt Tl`C. `B gt Al gt Tl gt In gt Ga`D. `B gt Al lt GA lt In lt Tl`
Answer» Correct Answer - C The expected order of decrease in melting points in `B gt Al gt Ga gt In gt Tl`. But this order is incorrect. Due to structure changes, melting point instead of decreasing increasing from Ga to Tl and as such Ga has the lowest melting point. Hence the actual order is `B gt Al gt Tl gt In gt Ga`.

Discussion

89.	The `I.E_(1)` among the group 13 member follows asA. `B gt Al lt Ga lt Tl`B. `B gt Al gt Ga gt Tl`C. `B gt Ga gt Al gt Tl`D. `B gt Ga lt Al lt Tl`
Answer» Correct Answer - C Unlike expected order of first ionization energy i.e., `B gt Al gt Ga`, the actual order of `IE_(1)` is `B gt Ga gt Al`. This is because of the small atomic size and greater effective nuclear charge, the valence electrons of Ga are held more tightly than Al. Hence `IE_(1)` of Ga is more than that of Al.

Discussion

90.	Which member of group 13 does not exhibit the group valency in its compounds?A. BoronB. AluminiumC. GalliumD. Thallium
Answer» Correct Answer - D Thallium due to inert pair effect.

Discussion

91.	Which of the following statements is incorrect ?A. `BF_(3)` is the weakest Lewis acidB. Ammonal is a mixture of aluminium compounds and is used in bombsC. `BF_(3)` exists as dimerD. `BCl_(3)` donot conduct electricity in its molten state.
Answer» Correct Answer - C `BF_(3)` exists as a monomer.

Discussion

92.	Group 13 elements exhibitA. Only +1 oxidation stateB. Only +3 oxidation stateC. Both +1 and +3 oxidation stateD. +1, +2 and +3 oxidation state
Answer» Correct Answer - C Both +1 and +3 oxidation state. (Inert pair effect.)

Discussion

93.	Which of the following statements is incorrect?A. Al compounds are ionicB. Al is a light metal or great tensile strengthC. Al is a powerful reducing agentD. Al does not react with steam even at higher temperature.
Answer» Correct Answer - A Aluminium forms both covalent and ionic compounds.

Discussion

94.	Which of the following statements is not true for Al and B ?A. They burn in oxygen to give oxides at higher temperatureB. Their halides are Lewis acidsC. They combine with nitrogen to form nitridesD. They react with HCl to form chloride.
Answer» Correct Answer - D Boron does not react with HCl to form chloride.

Discussion

95.	Which of the following techniques is used in the manufacture of aluminium from bauxiteA. Reduction with magnesiumB. Reduction with coke.C. Electrolytic reductionD. Reduction with iron.
Answer» Correct Answer - C Electrolytic reduction is used for this purpose.

Discussion

96.	Which of the following statements is correct?A. `BCl_(3)` and `AlCl_(3)` are both Lewis acids and `BCl_(3)` is stronger `AlCl_(3)`B. `BCl_(3)` and `AlCl_(3)` are both Lewis acids and `AlCl_(3)` is stronger than `BCl_(3)`C. `BCl_(3)` and `AlCl_(3)` are both equally strong Lewis acidsD. Both `BCl_(3)` and `AlCl_(3)` are not Lewis acids.
Answer» Correct Answer - B Both `BCl_(3)` and `AlCl_(3)` are Lewis acid, but `AlCl_(3)` is a stronger Lewis acid than `BCl_(3)`.

Discussion

97.	Which of the following is not a Lewis acid ?A. `AlCl_(3)`B. `SnCl_(4)`C. `FeCl_(3)`D. `AlCl_(3).6H_(2)O`
Answer» Correct Answer - D `AlCl_(3).6H_(2)O` is not a Lewis acid.

Discussion

98.	Which of the following is a Lewis acid?A. `PCl_(3)`B. `AlCl_(3)`C. `NCl_(3)`D. `AsCl_(3)`
Answer» Correct Answer - B `AlCl_(3)` is a Lewis acid.

Discussion

99.	In `B_(2)H_(6)`A. there is a direct boron-boron bondB. the boron atoms are linked through hydrogen bridgeC. the structure is similar to `C_(2)H_(6)`D. all the atoms are in one plane
Answer» Correct Answer - B Two hydrogens atoms act as bridged hydrogen atoms and involved in the formation of three centre-two electrons bonds.

Discussion

100.	Which of the following is not true about `B_(2)H_(6)` ?A. It contains two types of `B-H` bondsB. It contains one `B-B` bondC. It is an electron deficient compoundD. It contains multicentre bonds.
Answer» Correct Answer - B `B_(2)H_(6)` does not have any bond between the two boron atoms.

Discussion

Explore topic-wise InterviewSolutions in .

An example of alum isA. `Al_(2)(SO_(4))_(3).Na_(2)SO_(4).12H_(2)O`B. `FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)O`C. `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`D. `FeSO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`

Aluminium becomes passive inA. Conc. `HNO_(3)`B. `H_(2)CrO_(4)`C. `HClO_(4)`D. All

Alum is not usedA. as a mordant in dyeingB. as an insecticideC. in purification of waterD. in tanning of leather.

Which one of the following metal cannot be extracted by using Al as a reducing agent ?A. Na from `Na_(2)O`B. `Cr` from `Cr_(2)O_(3)`C. `Mn` from `Mn_(3)O_(4)`D. W from `WO_(3)`

A lake can be obtained by making a mixture of a coloured dye withA. `NH_(4)OH`B. `Ba(OH)_(2)`C. `Al(OH)_(3)`D. `NaOH`

Boric acid is polymeric due toA. its acidic natureB. the presence of hydrogen bondsC. its monobasic natureD. its geometry

Which of the following does not form `M^(3+)` ion?A. BoronB. AluminiumC. IndiumD. Gallium

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides ?A. `MgO lt K_(2)O lt Al_(2)O_(3) lt Na_(2)O`B. `Na_(2)O lt K_(2)O lt MgO lt Al_(2)O_(3)`C. `K_(2)O lt Na_(2)O lt Al_(2)O_(3) lt MgO`D. `Al_(2)O_(3) lt MgO lt Na_(2)O lt K_(2)O`

`AlCl_(3)` is hydroscopic in nature. It meansA. `AlCl_(3)` undergoes air oxidationB. `AlCl_(3)` is a strong oxidising agentC. `AlCl_(3)` absorbs moisture and becomes liquidD. `AlCl_(3)` absorbs moisture when exposed to air

Aluminium salt commonly used to stop bleeding isA. Aluminium sulphateB. Potash alumC. Aluminium chlorideD. Aluminium fluoride

Which of the following property does not support anomalous behaviour of boron?A. Small sizeB. High electronegativityC. High ionization energyD. Formation of trihalides

The aluminium salt commonly used to stop bleeding isA. Aluminium sulphateB. Potash alumC. Al,uminium chlorideD. Aluminium fluoride

The nature of the solution of Potash alum isA. BasicB. AcidicC. NeutralD. Amphoteric

Which of the following is not a protonic acid ?A. `SO_(2)(OH)_(2)`B. `B(OH)_(3)`C. `PO(OH)_(3)`D. `SO(OH)_(2)`

Aluminium reacts with caustic soda to formA. Aluminium hydroxideB. Aluminium oxideC. Sodium meta-aluminateD. Sodium tetra aluminate

Aluminium reacts with concentrated HCl and concentrated NaOH to liberate the gases.........respectively.A. `H_(2)` and `O_(2)`B. `O_(2)` and `H_(2)`C. `H_(2)` and `H_(2)`D. `O_(2)` and `O_(2)`

Alum helps in purification water byA. forming Si complex with clay particlesB. sulphate part which combines with dirt and removes it.C. aluminium which coagulates the mud particlesD. making mud water soluble

The amphoteric oxide from among the following isA. `B_(2)O_(3)`B. `In_(2)O_(3)`C. `Ga_(2)O_(3)`D. `Tl_(2)O_(3)`

Which one of the following is a correct statement ?A. Al is more acidic than that of BB. B is basic while that of Al is amphotericC. B is acidic while that of Al is amphotericD. B and Al are amphoteric

which of the following oxide is amphoteric ?A. `Na_(2)O`B. `MgO`C. `Al_(2)O_(3)`D. `CaO`

The apir of amphoteric hydroxide isA. `Al(OH)_(3), LiOH`B. `Be(OH)_(2), Mg(OH)_(2)`C. `Al(OH)_(3), Be(OH)_(2)`D. `Ni(OH)_(2), Zn(OH)_(2)`

Duralumina is an alloy ofA. Al and MgB. al, Mg and NiC. Al, Mg, Mn, CuD. Al and Ni

`B(OH)_(3)` isA. BasicB. MonobasicC. DibasicD. Tribasic

Among the halides of the elements of group 13 the one which is most acidic isA. `BF_(3)`B. `AlCl_(3)`C. `BCl_(3)`D. `B Br_(3)`

Assertion (A) : `B(OH)_(3)` is weakly basic. Reason (R) : B-O bonds can be broken easily.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. Both A and R are false.

Which of the following hydroxide is acidic?A. `Al(OH)_(3)`B. `Ga(OH)_(3)`C. `Tl(OH)_(3)`D. `B(OH)_(3)`

Which of the following is electron-deficient ?A. `PH_(3)`B. `(CH_(3))_(2)`C. `(SiH_(3))_(2)`D. `(BH_(3))_(2)`

Which of the following is an electron deficient compound?A. `MgCl_(2)`B. `BCl_(3)`C. `GeCl_(3)`D. `C Cl_(4)`

The species which can best serve as an initiater for the cationic polymerisation isA. `LiAlH_(4)`B. `HNO_(3)`C. `AlCl_(3)`D. `BaLi`

Thallium shows different oxidation states due to :A. of its high reactivityB. of inert pair of electronC. of its amphoteric natureD. it is a transition metal

In which of the following elements +1 oxidation state is more stable than +3A. BB. AlC. GaD. Tl

`TlI_(3)` is a black coloured sparingly soluble ionic compound. In its aqueous solution, it will giveA. `Tl^(+)` gives `I_(3)^(-)` ionsB. `Tl^(3+)` and `I^(-)` ionsC. `Tl^(+), I^(-)` ions and `I_(2)`D. `Tl^(+)` and `I^(-)` ions

Assertion (A) : `H_(3)BO_(3)` is a tribasic weak acid. Reason (R) : B is a typical non-metal.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. Both A and R are false.

Melting point is highest forA. BB. AlC. GaD. In

The melting pt. of Group 13 follows the orderA. `B gt Al gt Ga gt In gt Tl`B. `B gt Al lt Ga gt In gt Tl`C. `B gt Al gt Tl gt In gt Ga`D. `B gt Al lt GA lt In lt Tl`

The `I.E_(1)` among the group 13 member follows asA. `B gt Al lt Ga lt Tl`B. `B gt Al gt Ga gt Tl`C. `B gt Ga gt Al gt Tl`D. `B gt Ga lt Al lt Tl`

Which member of group 13 does not exhibit the group valency in its compounds?A. BoronB. AluminiumC. GalliumD. Thallium

Which of the following statements is incorrect ?A. `BF_(3)` is the weakest Lewis acidB. Ammonal is a mixture of aluminium compounds and is used in bombsC. `BF_(3)` exists as dimerD. `BCl_(3)` donot conduct electricity in its molten state.

Group 13 elements exhibitA. Only +1 oxidation stateB. Only +3 oxidation stateC. Both +1 and +3 oxidation stateD. +1, +2 and +3 oxidation state

Which of the following statements is incorrect?A. Al compounds are ionicB. Al is a light metal or great tensile strengthC. Al is a powerful reducing agentD. Al does not react with steam even at higher temperature.

Which of the following statements is not true for Al and B ?A. They burn in oxygen to give oxides at higher temperatureB. Their halides are Lewis acidsC. They combine with nitrogen to form nitridesD. They react with HCl to form chloride.

Which of the following techniques is used in the manufacture of aluminium from bauxiteA. Reduction with magnesiumB. Reduction with coke.C. Electrolytic reductionD. Reduction with iron.

Which of the following is not a Lewis acid ?A. `AlCl_(3)`B. `SnCl_(4)`C. `FeCl_(3)`D. `AlCl_(3).6H_(2)O`

Which of the following is a Lewis acid?A. `PCl_(3)`B. `AlCl_(3)`C. `NCl_(3)`D. `AsCl_(3)`

In `B_(2)H_(6)`A. there is a direct boron-boron bondB. the boron atoms are linked through hydrogen bridgeC. the structure is similar to `C_(2)H_(6)`D. all the atoms are in one plane

Which of the following is not true about `B_(2)H_(6)` ?A. It contains two types of `B-H` bondsB. It contains one `B-B` bondC. It is an electron deficient compoundD. It contains multicentre bonds.