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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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Free download in PDF Class 12 Chemistry Chapter 7 p Block Elements Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>

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(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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