Class 12 Chemistry Chapter 7 p Block Elements Objective Type Questions and Answers | Class 12 Chemistry Chapter 7 p Block Elements Quiz

(1) When Al is added to KOH solution

[A] No action takes place

[B] Oxygen is evolved

[C] Water is produced

[D] Hydrogen is evolved

Answer: Hydrogen is evolved

(2) Aluminium is more reactive than iron. But Aluminium is less easily corroded than iron because

[A] Aluminium is noble metal

[B] Oxygen forms a protective oxide layer

[C] Iron forms mono and divalent ions

[D] All the given

Answer: Oxygen forms a protective oxide layer

(3) Aluminium vessels should not be washed with materials containing washing soda since

[A] Washing soda is expensive

[B] Washing soda is easily decomposed

[C] Washing soda reacts with aluminium to form soluble aluminate

[D] Washing soda reats with aluminium to form insoluble aluminium oxide

Answer: Washing soda reacts with aluminium to form soluble aluminate

(4) Which of the statements about anhydrous aluminium chloride is corret

[A] It exists as AlCl₃ molecule

[B] It is not easily hydrolysed

[C] It sublimes at 100°C under vaccum

[D] All the given

Answer: It sublimes at 100°C under vaccum

(5) Number of water molecules in Mohr’s salt is

[A] 7

[B] 6

[C] 5

[D] 8

Answer: 6

(6) The liquid field metal expanding on solidification is

[A] Ga

[B] Al

[C] Zn

[D] Ca

Answer: Ga

(7) Aluminium chloride exists as dimer, Al₂Cl₆ in solid state as well as in solution of non-polar solvents such as benzene when dissolved in water gives

[A] [Al(OH)₆)^3- + 3HCl

[B] [Al(H₂O)₆)^3- + 3Cl^-

[C] Al³⁺ + 3Cl^-

[D] Al₂O₃+6HCl

Answer: [Al(H₂O)₆)^3- + 3Cl^-

(8) The hardest substance amongst the following is

[A] Be₂C

[B] Graphite

[C] SiC

[D] Titanium

Answer: Titanium

(9) Inorganic Benzene is

[A] B₂H₆

[B] B₃N₃H₆

[C] B₃O₃H₆

[D] (BH₃)₃

Answer: B₃N₃H₆

(10) Anhydrous AlCl₃ cannot be obtained from which of the following reactions

[A] Heating AlCl₃ • 6H₂O

[B] By Passing dry HCl over hot aluminium powder

[C] By Passing dry Cl₂ over hot aluminium powder

[D] By passing dry Cl₂ over a hot mixture of alumina and coke

Answer: Heating AlCl₃ • 6H₂O

(11) Diborane combines with ammonia at 120°C to give

[A] B₂H₆ NH₃

[B] B₂H₆. 2NH₃

[C] B₂H₆.3NH₃

[D] B₂H₆.4 NH₃

Answer: B₂H₆. 2NH₃

(12) Which metal burn in air at high temperature with the evolution of much heat.

[A] Cu

[B] Hg

[C] Pb

[D] Al

Answer: Al

(13) Moissan boron is ________

[A] Amorphous boron of ultra purity

[B] Crystaline boron of ultra purity

[C] Amorphous boron of low purity

[D] Crystalline boron of low purity

Answer: Amorphous boron of low purity

(14) Which of the following is only acidic in nature

[A] Be(OH)₂

[B] Mg(OH)₂

[C] B(OH)₃

[D] Al(OH)₃

Answer: B(OH)₃

(15) Which of the following does not exist in free form

(a) (b) (c) (d)

[A] BF₃

[B] BCl₃

[C] BBr₃

[D] BH₃

Answer: BH₃

(16) Alumina is ________

[A] Acidic

[B] Basic

[C] Amphoteric

[D] None of these

Answer: Amphoteric

(17) Hydrogen gas will not produce

[A] Heated cupric oxide

[B] Heated ferric oxide

[C] Heated stannic oxide

[D] Heated aluminium oxide

Answer: Heated aluminium oxide

(18) Conc.HNO₃ ________

[A] Reacts with aluminium vigrously

[B] Reacts with aluminium to form aluminium nitrate

[C] Doesn’t react with aluminium

[D] Reacts with platinum

Answer: Doesn’t react with aluminium

(19) Anhydrous AlCl3 is obtained from

[A] Dilute HCl & aluminium metal

[B] Aluminium & chlorine gas

[C] Hydrogen chloride gas & aluminium metal

[D] None of the above

Answer: Hydrogen chloride gas & aluminium metal

(20) Which is true for an element & present in III group of the periodic table

[A] It is gas at room temperature

[B] It has oxidation state of +4

[C] It forms R₂O₃

[D] It forms RX₂

Answer: It forms R₂O₃

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Class 12 Chemistry Chapter 7 p Block Elements MCQs | Class 12 Chemistry Chapter 7 p Block Elements Objective Type Questions and Answers

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