JEE Chemistry The P Block Elements MCQs Set A

Question. The non-metal oxides are ____x____ whereas metal oxides are ___y ____ in nature.
(a) x = acidic or neutral, y = basic
(b) x = acidic, y = neutral
(c) x = basic, y = acidic
(d) x = neutral, y = basic

Answer: A

Question. Which of the following is most abundant in the earth crust ?
(a) Aluminium
(b) Thallium
(c) Boron
(d) Gallium

Answer: A

Question. Which of the following properties of aluminium makes it useful for food packaging ?
(a) Low density
(b) Non toxicity
(c) Good thermal conductivity
(d) Good electrical conductivity

Answer: A

Question. Which of the following is/are true regarding gallium?
(i) It has unusually low melting point (303 K).
(ii) It exist in liquid state during summer.
(iii) It has a high boiling point (2676 K).
The correct option is
(a) (i), (ii) and (iii)
(b) (i) and (ii)
(c) (i) and (iii)
(d) (ii) and (iii)

Answer: A

Question. The element which shows least metallic character is
(a) Boron
(b) Indium
(c) None of these
(d) Gallium

Answer: A

Question. Which one of the following has the lowest m.p.?
(a) Ga
(b) B
(c) Al
(d) Tl

Answer: A

Question. Which of the following does not form M³⁺ ion?
(a) Boron
(b) Aluminium
(c) Gallium
(d) Indium

Answer: A

Question. The group 13 element that is liquid during summer and used for measuring high temperature is
(a) Gallium
(b) Boron
(c) Aluminium
(d) Indium

Answer: A

Question. Thallium shows different oxidation states because
(a) of inert pair effect
(b) it is transition element
(c) of its amphoteric character
(d) of its higher reactivity

Answer: A

Question. Which out of the following compounds does not exist?
(a) TlCl₅
(b) BF₃
(c) TlCl₃
(d) None of these

Answer: A

Question.  Aluminium chloride is a/an
(a) Lewis acid
(b) Bronsted - Lowery acid
(c) Arhenius acid
(d) Lewis base

Answer: A

Question. The strongest Lewis acid is
(a) BI₃
(b) BCl₃
(c) BF₃
(d) BBr₃

Answer: A

Question. AlCl₃ on hydrolysis gives
(a) Al(OH)₃
(b) AlCl₃.6H₂O
(c) Al₂O₃. H₂O
(d) None of these

Answer: A

Question. Which metal is protected by a layer of its own oxide?
(a) Al
(b) Au
(c) Ag
(d) Fe

Answer: A

Question. Aluminium vessels should not be washed with materials containing washing soda because
(a) washing soda reacts with aluminium to form soluble aluminate
(b) washing soda reacts with aluminium to form insoluble aluminium oxide
(c) washing soda is easily decomposed
(d) washing soda is expensive

Answer: A

Question. When Al is added to KOH solution
(a) hydrogen is evolved
(b) oxygen is evolved
(c) no action takes place
(d) water is produced

Answer: A

Question. Which of the following does not react with aqueous NaOH ?
(a) B
(b) Ga
(c) Al
(d) Tl

Answer: B

Question. Amphoteric oxide among the following is
(a) Ga₂O₃
(b) Tl₂O₃
(c) B₂O₃
(d) In₂O₃

Answer: A

Question. Boron forms covalent compound due to
(a) Both
(b) small size
(c) higher ionization energy
(d) None of these

Answer: A

Question. NH₃ and BF₃ form an adduct readily because they form
(a) a coordinate bond
(b) an ionic bond
(c) a hydrogen bond
(d) a covalent bond

Answer: A

Question. The factor responsible for weak acidic nature of B–F bonds in BF₃ is
(a) Tetra-borate
(b) Meta-borate
(c) Ortho-borate
(d) Double oxide

Answer: A

Question. In borax bead test which compound is formed?
(a) Meta-borate
(b) Tetra-borate
(c) Ortho-borate
(d) Double oxide

Answer: A

Question. The formula of mineral borax is
(a) Na₂B₄O₇ .10H₂O
(b) Na₂B₄O₇.4H₂O
(c) Na₂B₄O₇
(d) None of these

Answer: A

Question. Which of the following hydroxide is acidic ?
(a) B(OH)₃
(b) Ca(OH)₃
(c) Al(OH)₃
(d) Tl(OH)₃

Answer: A

Question. H₃BO₃ on heating up to 373 K yields:
(a) metaboric acid
(b) tetraboric acid
(c) boric anhydride
(d) orthoboric acid

Answer: B

Question. Boric acid is polymeric due to
(a) the presence of hydrogen bonds
(b) its acidic nature
(c) its monobasic nature
(d) its geometry

Answer: A

Question. B(OH)₃ is
(a) monobasic acid
(b) tribasic acid
(c) dibasic acid
(d) triacidic base

Answer: A

Question. Orthoboric acid when heated to red hot gives
(a) pyroboric acid
(b) boric anhydride
(c) metaboric acid
(d) boron and water

Answer: A

Question. Which is false in case of boric acid H₃BO₃?
(a) It acts as a tribasic acid.
(b) It has a planar structure
(c) It acts as a monobasic acid
(d) It is soluble in hot water

Answer: A

Question. BCl₃ does not exist as dimer but BH3 exists as dimer (B₂H₆) because
(a) large sized chlorine atoms do not fit in between the small boron atoms where as small sized hydrogen atoms get fitted in between boron atoms
(b) None of the above
(c) chlorine is more electronegative than hydrogen
(d) None of these

Answer: A

Question. Inorganic benzene is
(a) B₃H₆N₃
(b) H₃B₃N₆
(c) Both
(d) None of these

Answer: A

Question. The structure of diborane ( B₂H₆ ) contains
(a) four 2c-2e bonds and two 3c-2e bonds
(b) two 2c-2e bonds and four 3c-2e bonds
(c) two 2c-2e bonds and two 3c-3e bonds
(d) four 2c-2e bonds and four 3c-2e bonds

Answer: A

Question. In diborane
(a) 2– bridged hydrogens and four terminal hydrogens are present
(b) 3–bridged and three terminal hydrogens are present
(c) None of these
(d) 4–bridged hydrogens and two terminal hydrogens are present

Answer: A

Question. Diborane upon hydrolysis gives
(a) orthoboric acid
(b) boric anhydride
(c) metaboric acid
(d) boron oxide

Answer: A

Question. Borazole is known as
(a) inorganic benzene
(b) organic benzene
(c) organic xylene
(d) inorganic xylene

Answer: A

Question. The compounds of boron and hydrogen are collectively called
(a) boranes
(b) borazoles
(c) diboranes
(d) boracits

Answer: A

Question. The two type of bonds present in B₂H₆ are covalent and
(a) hydrogen bridge bond
(b) ionic
(c) co-ordinate
(d) None of these

Answer: A

Question. The electronic configuration of four different elements is given below. Identify the group 14 element among these
(a) [Ne] 3s²3p²
(b) [He] 2s¹
(c) [Ne] 3s²
(d) None of these

Answer: A

Question. Which of the following is most electronegative?
(a) C
(b) Pb
(c) Si
(d) Sn

Answer: C

Question. Which of the following isotope of carbon is radioactive?
(a) 14_C
(b) 12_C
(c) 13_C
(d) All of these

Answer: A

Question. Carbon and silicon belong to group 14. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to
(a) availability of d-orbitals in silicon
(b) more electropositive nature of silicon
(c) large size of silicon
(d) None of these

Answer: A

Question. The inert pair effect is most prominent in
(a) Pb
(b) Si
(c) C
(d) Ge

Answer: A

Question. The most stable +2 oxidation state is exhibited by
(a) Pb
(b) Fe
(c) Sn
(d) Si

Answer: A

Question. Which of the following lead oxides is present in ‘Sindhur’?
(a) Pb₃O₄
(b) PbO₂
(c) PbO
(d) None of these

Answer: A

Question. Mark the oxide which is amphoteric in character
(a) SnO₂
(b) CO₂
(c) SiO₂
(d) CaO

Answer: A

Question. Red lead is
(a) Pb₃O₄
(b) Pb₂O₃
(c) PbO
(d) None of these

Answer: A

Question. The oxide of lead used in lead accumulators is
(a) PbO₂
(b) Pb₂O₃
(c) PbO
(d) None o these

Answer: A

Question. Least thermally stable is
(a) GeBr₄
(b) SiCl₄
(c) CCl₄
(d) GeCl₄

Answer: A

Question. Unlike the other elements of its group carbon and silicon does not form MX₂ type molecules because
(a) energetically this is not possible
(b) carbon undergoes catenation
(c) it is non-metallic
(d) carbon does not contain d-orbital

Answer: A

Question. Which of the following halides is the most stable?
(a) CF₄
(b) CBr₄
(c) CI₄
(d) CCl₄

Answer: A

Question. The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence
(a) SiX₂ << GeX₂ << SnX₂ << PbX₂
(b) SiX₂ << GeX₂ << PbX₂ << SnX₂
(c) GeX₂ << SiX₂ << SnX₂ << PbX₂
(d) None of these

Answer: A

Question. When ammonia is heated with cupric oxide, a molecule of ammonia will
(a) lose 3 electrons
(b) lose 2 electrons
(c) gain 3 electrons
(d) gain 2 electrons

Answer: A

Question. In which the NH₃ is not used ?
(a) Anaesthetic
(b) Cold storage
(c) Manufacture of rayon and plastic
(d) None of these

Answer: A

Question. Liquid ammonia bottles are opened after cooling them in ice for sometime. It is because liquid NH₃
(a) Has a high vapour pressure
(b) Brings tears to the eyes
(c) Is a corrosive liquid
(d) Is a mild explosive

Answer: A

Question. Nitrogen dioxide cannot be obtained by heating
(a) KNO₃
(b) Pb(NO₃)₂
(c) AgNO₃
(d) None of these

Answer: A

Question. The bonds present in N₂O₅ are
(a) covalent and coordinate
(b) covalent and ionic
(c) only ionic
(d) only covalent

Answer: A

Question. Which of the following oxides of nitrogen is a coloured gas?
(a) NO₂
(b) NO
(c) N₂O
(d) None of these

Answer: A

Question. Which of the following oxides is neutral ?
(a) N₂O
(b) N₂O₄
(c) N₂O₃
(d) N₂O₅

Answer: A

Question. In which one of the following oxides of nitrogen, one nitrogen atom is not directly linked to oxygen?
(a) N₂O
(b) NO
(c) N₂O₄
(d) N₂O₃

Answer: A

Question. Which of the following oxides of nitrogen reacts with FeSO₄ to form a dark brown compound
(a) NO
(b) N₂O₃
(c) N₂O
(d) NO₂

Answer: A

Question. Which oxide of nitrogen is obtained on heating ammonium nitrate at 250ºC ?
(a) Nitrous oxide
(b) Dinitrogen tetraoxide
(c) Nitric oxide
(d) Nitrogen dioxide

Answer: A

Question. Which of the following can be used as an anaesthesia
(a) N₂O
(b) NCl₃
(c) NO
(d) NO₂

Answer: A

Question. A deep brown gas is formed by mixing two colourless gases which are
(a) NO and O₂
(b) NO₂ and O₂
(c) N₂O and NO
(d) None of these

Answer: A

Question. Which of the following elements does not form stable diatomic molecules ?
(a) Phosphorus
(b) Oxygen
(c) Iodine
(d) Nitrogen

Answer: A

Question. The catalyst used in the manufacture of HNO₃ by Ostwald’s process is
(a) platinum gauze
(b) finely divided nickel
(c) vanadium pentoxide
(d) platinum black

Answer: A

Question. Concentrated nitric acid, upon long standing, turns yellow brown due to the formation of
(a) NO₂
(b) N₂O₄
(c) NO
(d) N₂O

Answer: A

Question. Which of the following trihalide is unstable?
(a) NCl₃
(b) AsCl₃
(c) NF₃
(d) SbBr₃

Answer: A

Question. Which of the following is the strongest reducing agent
(a) BiH₃
(b) NH₃
(c) PH₃
(d) SbH₃

Answer: A

Question. Which of the following element will form acidic oxides of type E₂O₃
(a) P
(b) Sb
(c) As
(d) Bi

Answer: A

Question. Which one of the following is not an use of ammonia
(a) In the pickling of stainless steel
(b) As a refrigerate
(c) In manufacture of nitric acid
(d) To produce various nitrogenous fertilizers

Answer: A

Question. Zinc on reaction with dilute HNO₃ gives x and zinc on reaction with concentrated HNO₃ gives y. Identify x and y
(a) x = N₂O , y = NO₂
(b) x = N₂O , y = NO
(c) x = NO , y = NO₂
(d) None of these

Answer: A

Question. Which of the following is incorrect for white and red phosphorus
(a) They are both soluble in CS₂
(b) They can be oxidised by heating in air
(c) They consist of the same kind of atoms
(d) They can be converted into one another

Answer: A

Question. Which of the following phosphorus is most reactive
(a) White phosphorus
(b) Violet phosphorus
(c) Red phosphorus
(d) Scarlet phosphorus

Answer: A

Question. White phosphorus is
(a) P₄, a tetrahedral solid
(b) a linear diatomic molecule
(c) a monoatomic gas
(d) P₈, a crown

Answer: A

Question. Which property of white phosphorus is common to red phosphorous
(a) It burns when heated in air
(b) It reacts with hot caustic soda solution to give phosphine
(c) It shows chemiluminescence
(d) It is soluble in carbon disulphide

Answer: A

Question. Which of the following statements regarding allotropic forms of phosphorus is incorrect?
(a) Red phosphorus on heating catches fire and give dense red fumes of P₄O₁₀
(b) White phosphorus is more reactive than red and black due to high angular strain
(c) Red phosphorus is polymeric in nature consisting of chains of P₄ tetrahedral
(d) None of these

Answer: A

Question. Which of the following is incorrect?
(a) Monoclinic sulphur is stable below 369 K
(b) Specific gravity of rhombic sulphur > specific gravity of monoclinic sulphur
(c) M.p of monoclinic sulphur > m.p. of rhombic sulphur
(d) Both rhombic sulphur and monoclinic sulphur have S₈ molecules.

Answer: A